Publications from Organic Photovoltaics Thrust

  1. Rajagopal, A.; Yao, K.; and Jen, A. K.-Y. “Toward Perovskite Solar Cell Commercialization: A Perspective and Research Roadmap Based on Interfacial Engineering” Adv. Mater., In Press, 2018. (Hall of Fame Virtual Issue)

  2. Zhao, T.; Liu, H.; Ziffer, M. E.; Rajagopal, A.; Zuo, L.; Ginger, D. S.; Li, X.; and Jen, A. K.-Y. “Realization of a Highly Oriented MAPbBr3 Perovskite Thin Film via Ion Exchange for Ultrahigh Color Purity Green Light Emission” ACS Energy Lett., 3, 1662-1669, 2018.

  3. Braly, I. L.; Stoddard, R. J.; Rajagopal, A.; Jen, A. K.-Y.; and Hillhouse, H.W. “Photoluminescence and Photoconductivity to Assess Maximum Open-Circuit Voltage and Carrier Transport in Hybrid Perovskites and Other Photovoltaic Materials” J. Phys. Chem. Lett., 9, 3779-3792, 2018.

  4. Rajagopal, A.; Stoddard, R. J.; Jo, S. B.; Hillhouse, H. W.; and Jen, A. K.-Y. “Overcoming the Photovoltage Plateau in Large Bandgap Perovskite Photovoltaics” Nano Lett., 18, 3985-3993, 2018.

  5. Stoddard, R. J.; Rajagopal, A.; Palmer, R. L.; Braly, I. L.; Jen, A. K.-Y.; and Hillhouse, H. W. “Enhancing Defect Tolerance and Phase Stability of High-Bandgap Perovskites via Guanidinium Alloying” ACS Energy Lett., 3, 1261-1268, 2018.

  6. Gao, K.; Xu, B.; Hong, C.; Shi, X.; Liu, H.; Li, X.; Xie, L.; and Jen, A. K.-Y. “Di‐Spiro‐Based Hole‐Transporting Materials for Highly Efficient Perovskite Solar Cells ” Adv. Energy Mater., In Press, 2018.

  7. Yan, C.; Barlow, S.; Wang, Z.; Yan, H.; Jen, A. K.-Y.; Marder, S. R.; and Zhan, X. “Non-fullerene acceptors for organic solar cells” Nature Review Materials., 3, 18003, 2018.

  8. Zuo, L.; Shi, X.; Jo, S. B.; Liu, Y.; Lin, F.; and Jen, A. K.-Y. “Tackling Energy Loss for High‐Efficiency Organic Solar Cells with Integrated Multiple Strategies” Adv. Mater., In Press, 2018.

  9. Ju, D.; Dang, Y.; Zhu, Z.; Liu, H.; Chueh, C.-C.; Li, X.; Wang, L.; Hu, X.; Jen, A. K.-Y.; and Tao, X. “Tunable Band Gap and Long Carrier Recombination Lifetime of Stable Mixed CH3NH3PbxSn1–xBr3 Single Crystals ” Chem. Mater., 30, 1556-1565, 2018.

  10. Zhang, H.; Wang, H.; Zhu, H.; Chueh, C.-C.; Chen, W.; Yang, S.; and Jen, A. K.-Y. “Low‐Temperature Solution‐Processed CuCrO2 Hole‐Transporting Layer for Efficient and Photostable Perovskite Solar Cells ” Adv. Energy Mater., In Press, 2018.

  11. An, Y.; Liao, X.; Chen, L.; Yin, J.; Ai, Q.; Xie, Q.; Huang, B.; Liu, F.; Jen, A. K.-Y.; and Chen, Y. “Nonhalogen Solvent‐Processed Asymmetric Wide‐Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency ” Adv. Funct. Mater., In Press, 2018.

  12. Yao, Z.; Liao, X.; Gao, K.; Lin, F.; Xu, X.; Shi, X.; Zuo, L.; Liu, F.; Chen, Y.; and Jen, A. K.-Y. “Dithienopicenocarbazole-Based Acceptors for Efficient Organic Solar Cells with Optoelectronic Response Over 1000 nm and an Extremely Low Energy Loss ” J. Am. Chem. Soc., 140, 2054-2057, 2018.

  13. Shi, X.; Chen, J.; Gao, K.; Zuo, L.; Yao, Z.; Liu, F.; Tang, J.; and Jen, A. K.-Y. “Terthieno[3,2‐b]Thiophene (6T) Based Low Bandgap Fused‐Ring Electron Acceptor for Highly Efficient Solar Cells with a High Short‐Circuit Current Density and Low Open‐Circuit Voltage Loss ” Adv. Energy Mater., In Press, 2018.

  14. Sha, W. E.; Zhang, H.; Wang, Z. S.; Zhu, H. L.; Ren, X.; Lin, F.; Jen, A. K.-Y.; and Choy, W. C. “Quantifying Efficiency Loss of Perovskite Solar Cells by a Modified Detailed Balance Model” Adv. Energy Mater., 8, 1701586, 2018.

  15. Zhu, Z.; Chueh, C.-C.; Li, N.; Mao, C.; and Jen, A. K.-Y. “Realizing Efficient Lead-Free Formamidinium Tin Triiodide Perovskite Solar Cells via a Sequential Deposition Route” Adv. Mater., 30, 1703800, 2018.

  16. Dong, H.; Wu, Z.; Xi, J.; Xu, X.; Zuo, L.; Lei, T.; Zhao, X.; Zhang, L.; Hou, X.; and Jen, A. K.-Y. “Pseudohalide-Induced Recrystallization Engineering for CH3NH3PbI3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells” Adv. Funct. Mater., 28, 1704836, 2018.

  17. Zhu, Z.; Zhao, D.; Chueh, C.-C.; Shi, X.; Li, Z.; and Jen, A. K.-Y. “Highly Efficient and Stable Perovskite Solar Cells Enabled by All-Crosslinked Charge-Transporting Layers” Joule, 2, 168-183, 2018.

  18. Yang, Z.; Rajagopal, A.; and Jen, A. K.-Y. “Ideal Bandgap Organic–Inorganic Hybrid Perovskite Solar Cells” Adv. Mater., 29, 1704418, 2017.

  19. Gao, K.; Zhu, Z.; Xu, B.; Jo, S. B.; Kan, Y.; Peng, X.; and Jen, A. K.-Y. “Highly Efficient Porphyrin-Based OPV/Perovskite Hybrid Solar Cells with Extended Photoresponse and High Fill Factor” Adv. Mater., 29, 1703980, 2017.

  20. Wang, H.; Zhang, H.; Chueh, C.-C.; Zhao, T.; Mao, C.; Chen, W.; and Jen, A. K. Y. “Enhanced crystallization and performance of formamidinium lead triiodide perovskite solar cells through PbI2-SrCl2 modulation” Materials Today Energy, In Press, 2017.

  21. Wang, Q.; Lin, F.; Chueh, C.-C.; Zhao, T.; Eslamian, M.; and Jen, A. K. Y. “Enhancing efficiency of perovskite solar cells by reducing defects through imidazolium cation incorporation” Materials Today Energy, In Press, 2017.

  22. Rajagopal, A.; Liang, P.-W.; Chueh, C.-C.; Yang, Z.; and Jen, A. K. Jen, A. K.-Y. “Defect Passivation via a Graded Fullerene Heterojunction in Low-Bandgap Pb–Sn Binary Perovskite Photovoltaics” ACS Energy Lett., 2, 2531-2539, 2017.

  23. Wang, Q.; Chueh, C.-C.; Zhao, T.; Cheng, J.; Eslamian, M.; Choy, W. C.; and Jen, A. K.-Y. “Effects of Self-Assembled Monolayer Modification of Nickel Oxide Nanoparticles Layer on the Performance and Application of Inverted Perovskite Solar Cells” ChemSusChem., 10, 3794, 2017.

  24. Braly, I. L.; Stoddard, R. J.; Rajagopal, A.; Uhl, A. R.; Katahara, J. K.; Jen, A. K.-Y.; and Hillhouse, H. W. “Current-Induced Phase Segregation in Mixed Halide Hybrid Perovskites and its Impact on Two-Terminal Tandem Solar Cell Design” ACS Energy Lett., 2, 1841-1847, 2017.

  25. Rajagopal, A.; Yang, Z.; Jo, S. B.; Braly, I. L.; Liang, P.-W.; Hillhouse, H. W.; and Jen, A. K.-Y. “Highly Efficient Perovskite–Perovskite Tandem Solar Cells Reaching 80% of the Theoretical Limit in Photovoltage” Adv. Mater., 29, 1702140, 2017.

  26. Zuo, L.; Yu, J.; Shi, X.; Lin, F.; Tang, W.; and Jen, A. K.-Y. “High-Efficiency Nonfullerene Organic Solar Cells with a Parallel Tandem Configuration” Adv. Mater., 29, 1702547, 2017.

  27. Xu, B.; Zhu, Z.; Zhang, J.; Liu, H.; Chueh, C.-C.; Li, X.; and Jen, A. K.-Y. “4-Tert-butylpyridine Free Organic Hole Transporting Materials for Stable and Efficient Planar Perovskite Solar Cells” Adv. Energy Mater., 7, 1700683, 2017.

  28. Wang, Y.; Zhu, Z.; Chueh, C.-C.; Jen, A. K.-Y.; and Chi, Y. “Spiro-Phenylpyrazole-9,9′-Thioxanthene Analogues as Hole-Transporting Materials for Efficient Planar Perovskite Solar Cells” Adv. Energy Mater., 7, 1700823, 2017.

  29. Xu, X.; Chueh, C.-C.; Jing, P.; Yang, Z.; Shi, X.; Zhao, T.; Lin, L. Y.; and Jen, A. K.-Y. “High-Performance Near-IR Photodetector Using Low-Bandgap MA0.5FA0.5Pb0.5Sn0.5I3 Perovskite” Adv. Funct. Mater., 27, 1701053, 2017.

  30. Chen, H.; Fu, W.; Huang, C.; Zhang, Z.; Li, S.; Ding, F.; Shi, M.; Li, C. Z.; Jen, A. K.-Y.; and Chen, H. “Molecular Engineered Hole-Extraction Materials to Enable Dopant-Free, Efficient p-i-n Perovskite Solar Cells” Adv. Energy Mater., 7, 1700012, 2017.

  31. Xu, B.; Zhang, J.; Hua, Y.; Liu, P.; Wang, L.; Ruan, C.; Li, Y.; Boschloo, G.; Johansson, E. M.; Kloo, L.; Hagfeldt, A.; Jen, A. K.-Y.; and Sun, L. “Tailor-Making Low-Cost Spiro [fluorene-9, 9′-xanthene]-Based 3D Oligomers for Perovskite Solar Cells” Chem, 2, 676-687, 2017.

  32. Williams, S. T.; Rajagopal, A.; Jo, S. B.; Chueh, C.-C.; Tang, T. F. L.; Kraeger, A.; and Jen, A. K.-Y. “Realizing a new class of hybrid organic–inorganic multifunctional perovskite” J. Mater. Chem. A., 5, 10640-10650, 2017.

  33. Zhong, H.; Ye, L.; Chen, J. Y.; Jo, S. B.; Chueh, C.-C.; Carpenter, J. H.; Ade, H.; and Jen, A. K.-Y. “A regioregular conjugated polymer for high performance thick-film organic solar cells without processing additive” J. Mater. Chem. A., 5, 10517-10525, 2017. (Part of the themed collection: 2017 Journal of Material Chemistry A HOT Papers)

  34. Chen, Q.; Chen, L.; Ye, F.; Zhao, T.; Tang, F.; Rajagopal, A.; Jiang, Z.; Jiang, S.; Jen, A. K.-Y.; Xie, Y.; Cai, J.; and Chen, L. “Ag-Incorporated Organic–Inorganic Perovskite Films and Planar Heterojunction Solar Cells” Nano Lett., 17, 3231-3237, 2017. (Selected as ACS Editors’ Choice)

  35. Zhang, H.; Wang, H.; Williams, S. T.; Xiong, D.; Zhang, W.; Chueh, C.-C.; Chen, W.; and Jen, A. K. Y. “SrCl2 Derived Perovskite Facilitating a High Efficiency of 16% in Hole-Conductor-Free Fully Printable Mesoscopic Perovskite Solar Cells” Adv. Mater., 29, 1606608, 2017.

  36. Xu, X.; Chueh, C.-C.; Yang, Z.; Rajagopal, A.; Xu, J.; Jo, S. B.; and Jen, A. K.-Y. “Ascorbic acid as an effective antioxidant additive to enhance the efficiency and stability of Pb/Sn-based binary perovskite solar cells” Nano Energy, 34, 392-398, 2017.

  37. Chen, J.-Y.; Chueh, C.-C.; Zhu, Z.; Chen, W.-C.; and Jen, A. K.-Y. “Low-temperature electrodeposited crystalline SnO2 as an efficient electron-transporting layer for conventional perovskite solar cells” Sol. Energ. Mat. Sol. Cells., 164, 47-55, 2017.

  38. Zhang, H.; Cheng, J.; Li, D.; Lin, F.; Mao, J.; Liang, C.; Jen, A. K.-Y.; Grätzel, M.; and Choy, W.C. “Toward All Room-Temperature, Solution-Processed, High-Performance Planar Perovskite Solar Cells: A New Scheme of Pyridine-Promoted Perovskite Formation” Adv. Mater., 29, 1604695, 2017.

  39. Uhl, A. R.; Yang, Z.; Jen, A. K.-Y.; and Hillhouse, H. W. “Solution-processed chalcopyrite–perovskite tandem solar cells in bandgap-matched two- and four-terminal architectures” J. Mater. Chem. A., 5, 3214-3220, 2017.

  40. Zhang, H.; Li, D.; Cheng, J.; Lin, F.; Mao, J.; Jen, A. K.-Y.; Grätzel, M.; and Choy, W. C. “Room temperature formation of organic–inorganic lead halide perovskites: design of nanostructured and highly reactive intermediates” J. Mater. Chem. A., 5, 3599-3608, 2017.

  41. Chueh, C.-C.; Li, C. Z.; Ding, F.; Li, Z. A.; Cernetic, N.; Li, X.; and Jen, A. K.-Y. “Doping Versatile n-Type Organic Semiconductors via Room Temperature Solution-Processable Anionic Dopants” ACS Appl. Mater. Interfaces., 9, 1136-1144, 2017.

  42. Zhang, H.; Wang, H.; Chen, W.; and Jen, A. K.-Y. “CuGaO2: A Promising Inorganic Hole-Transporting Material for Highly Efficient and Stable Perovskite Solar Cells” Adv. Mater., 29, 1604984, 2017.

  43. Jo, J. W.; Jung, J. W.; Ahn, H.; Ko, M. J.; Jen, A. K.-Y.; and Son, H. J. “Effect of Molecular Orientation of Donor Polymers on Charge Generation and Photovoltaic Properties in Bulk Heterojunction All-Polymer Solar Cells” Adv. Energy Mater., 7, 1601365, 2017.

  44. Li, N.; Zhu, Z.; Chueh, C.-C.; Liu, H.; Peng, B.; Petrone, A.; Li, X.; Wang, L.; and Jen, A. K.-Y. “Mixed Cation FAxPEA1–xPbI3 with Enhanced Phase and Ambient Stability toward High-Performance Perovskite Solar Cells” Adv. Energy Mater., 7, 1601307, 2017.

  45. Zhu, Z.; Xu, J. Q.; Chueh, C.-C.; Liu, H.; Li, Z. A.; Li, X.; Chen, H.; and Jen, A. K.-Y. “A Low-Temperature, Solution-Processable Organic Electron-Transporting Layer Based on Planar Coronene for High-performance Conventional Perovskite Solar Cells” Adv. Mater., 28, 10786-10793, 2016.

  46. Yang, Z.; Rajagopal, A.; Jo, S. B.; Chueh, C.-C.; Williams, S. T.; Huang, C. C.; Katahara, J. K.; Hillhouse, H. W.; and Jen, A. K.-Y. “Stabilized Wide Bandgap Perovskite Solar Cells by Tin Substitution” Nano Lett., 16, 7739-7747, 2016.

  47. Liu, X.; Yang, Z.; Chueh, C.-C.; Rajagopal, A.; Williams, S. T.; Sun, Y.; and Jen, A. K.-Y., “Improved efficiency and stability of Pb–Sn binary perovskite solar cells by Cs substitution” J. Mater. Chem. A., 4, 17939-17945, 2016.

  48. Wang, Q.; Chueh, C.-C.; Eslamian, M.; and Jen, A. K.-Y. “Modulation of PEDOT:PSS pH for Efficient Inverted Perovskite Solar Cells with Reduced Potential Loss and Enhanced Stability” ACS Appl. Mater. Interfaces., 8, 32068-32076, 2016.

  49. Zhao, T.; Chueh, C.-C.; Chen, Q.; Rajagopal, A.; and Jen, A. K.-Y. “Defect Passivation of Organic–Inorganic Hybrid Perovskites by Diammonium Iodide toward High-Performance Photovoltaic Devices” ACS Energy Lett., 1, 757-763, 2016.

  50. Yang, Z.; Rajagopal, A.; Chueh, C.-C.; Jo, S. B.; Liu, B.; Zhao, T.; and Jen, A. K.-Y. “Stable Low-Bandgap Pb–Sn Binary Perovskites for Tandem Solar Cells” Adv. Mater., In Press, 2016.

  51. Li, Z. A.; Zhu, Z.; Chueh, C.-C.; Jo, S. B.; Luo, J.; Jang, S.-H.; and Jen, A. K.-Y. “Rational Design of Dipolar Chromophore as an Efficient Dopant-Free Hole-Transporting Material for Perovskite Solar Cells” J. Am. Chem. Soc., 138, 11833-11839, 2016.

  52. Zhu, Z.; Chueh, C.-C.; Zhang, G.; Huang, F.; Yan, H.; and Jen, A. K.-Y. “Improved Ambient-Stable Perovskite Solar Cells Enabled by a Hybrid Polymeric Electron-Transporting Layer” ChemSusChem., In Press, 2016.

  53. Liu, X.; Chueh, C.-C.; Zhu, Z.; Jo, S. B.; Sun, Y.; and Jen, A. K.-Y. “Highly Crystalline Zn2SnO4 Nanoparticles as Efficient Electron-Transporting Layers toward Stable Inverted and Flexible Conventional Perovskite Solar Cells” J. Mater. Chem. A., In Press, 2016.

  54. Li, Z. A.; Zhu, Z.; Chueh, C.-C.; Luo, J.; and Jen, A. K.-Y. “Facile Thiol-Ene Thermal Crosslinking Reaction Facilitated Hole-Transporting Layer for Highly Efficient and Stable Perovskite Solar Cells” Adv. Energy Mater., In Press, 2016.

  55. Yu, J.; Xi, Y.; Chueh, C.-C.; Zhao, D.; Lin, F.; Pozzo, L. D., Tang, W. and Jen, A. K.-Y. “A Room-Temperature Processable PDI-Based Electron-Transporting Layer for Enhanced Performance in PDI-Based Non-Fullerene Solar Cells” Adv. Mater. Inter., In Press, 2016.

  56. Zhao, D.; Zhu, Z.; Kuo, M.-Y.; Chueh, C.-C.; and Jen, A. K.-Y. “Hexaazatrinaphthylene Derivatives: Efficient Electron-Transporting Materials with Tunable Energy Levels for Inverted Perovskite Solar Cells” Angew. Chem. Int., 55, 8999-9003, 2016.

  57. Li, C.-Z.; Huang, J.; Ju, H.; Zang, Y.; Zhang, J.; Zhu, J.; Chen, H; and Jen, A. K.-Y. “Modulate Organic-Metal Oxide Heterojunction via [1,6] Azafulleroid for Highly Efficient Organic Solar Cells” Adv. Mater., 28, 7269-7275, 2016.

  58. Yen, H. J.; Liang, P.-W.; Chueh, C.-C.; Yang, Z.; Jen, A. K.-Y.; Wang, H.-L. “Large Grained Perovskite Solar Cells Derived from Single-Crystal Perovskite Powders with Enhanced Ambient Stability” ACS Appl. Mater. Interfaces, 8, 14513-14520, 2016.

  59. Zhu, Z.; Bai, Y.; Liu, X.; Chueh, C.-C.; Yang, S.; Jen, A. K.-Y. “Enhanced Efficiency and Stability of Inverted Perovskite Solar Cells Using Highly Crystalline SnO2 Nanocrystals as the Robust Electron‐Transporting Layer” Adv. Mater., 28, 6478-6484, 2016.

  60. Liu, X.; Tsai, K. W.; Zhu, Z.; Sun, Y.; Chueh, C.-C.; Jen, A. K.-Y. “A Low-Temperature, Solution Processable Tin Oxide Electron-Transporting Layer Prepared by the Dual-Fuel Combustion Method for Efficient Perovskite Solar Cells” Adv. Mater. Inter., 3, 1600122, 2016.

  61. Zhu, Z.; Chueh, C.-C.; Lin, F.; Jen, A. K.-Y. “Enhanced Ambient Stability of Efficient Perovskite Solar Cells by Employing a Modified Fullerene Cathode Interlayer” Adv. Sci., 3, 160027, 2016.

  62. Zhao, T.; Williams, S. T.; Chueh, C.-C.; deQuilettes, D. W.; Liang, P.-W.; Ginger, D. S; Jen, A. K.-Y. “Design rules for the broad application of fast (<1 s) methylamine vapor based, hybrid perovskite post deposition treatments” RSC Adv., 6, 27475-27484, 2016.

  63. Jo, J. W.; Jung, J. W.; Bae, S.; Ko, M. J., Kim, H.; Jo, W. H.; Jen, A. K.-Y.; Son, H. J. “Development of Self‐Doped Conjugated Polyelectrolytes with Controlled Work Functions and Application to Hole Transport Layer Materials for High‐Performance Organic Solar Cells” Adv. Mater. Inter., 3, 1500703, 2016.

  64. Rajagopal, A.; Williams, S. T.; Chueh, C.-C.; Jen, A. K.-Y. “Abnormal Current-Voltage Hysteresis Induced by Reverse Bias in Organic-Inorganic Hybrid Perovskite Photovoltaics” J. Phys. Chem. Lett., 7, 995-1003, 2016.

  65. Yang, Z.; Chueh, C.-C.; Liang, P.-W.; Crump, M.; Lin, F.; Zhu, Z.; Jen, A. K.-Y. “Effects of formamidinium and bromide ion substitution in methylammonium lead triiodide toward high-performance perovskite solar cells” Nano Energy, 22, 328-337, 2016.

  66. Huang, C.; Fu, W.; Li, C.-Z.; Zhang, Z.; Qiu, W.; Shi, M.; Heremans, P.; Jen, A.K.-Y.; Chen, H. “A Dopant-Free Hole-Transporting Material with a C3h Symmetrical Truxene Core for Highly Efficient Perovskite Solar Cells” J. Am. Chem. Soc., 138, 2528-2531, 2016.

  67. Williams, S. T.; Rajagopal, A.; Chueh, C.-C.; Jen, A. K.-Y. “Current Challenges and Prospective Research for Upscaling Hybrid Perovskite Photovoltaics” J. Phys. Chem. Lett., 7, 811-819, 2016. (Perspective Video)

  68. Huang, J.; Carpenter, J. H.; Li, C.-Z.; Yu, J.-S.; Ade, H.; Jen, A. K.-Y. “Highly Efficient Organic Solar Cells with Improved Vertical Donor–Acceptor Compositional Gradient Via an Inverted Off-Center Spinning Method” Adv. Mater., 28, 967-974, 2016.

  69. Zuo, L.; Chang, C. Y.; Chueh, C.-C.; Xu, Y.; Chen, H.; Jen, A. K.-Y. “Manipulation of optical field distribution in ITO-free micro-cavity polymer tandem solar cells via the out-of-cell capping layer for high photovoltaic performance” J. Mater. Chem. A, 4, 961-968, 2016.

  70. Jung, J. W.; Chueh, C.-C.; Jen, A. K.-Y. “A Low-Temperature, Solution-Processable, Cu-Doped Nickel Oxide Hole-Transporting Layer via the Combustion Method for High-Performance Thin-Film Perovskite Solar Cells” Adv. Mater., 27, 7874-7880, 2015.

  71. Kim, J. H.; Chueh, C.-C.; Williams, S. T.; Jen, A. K.-Y. “Room-temperature, solution-processable organic electron extraction layer for high-performance planar heterojunction perovskite solar cells” Nanoscale, 7, 17343-17349, 2015.

  72. Liu, S.-Y.; Jung, J. W.; Li, C.-Z.; Huang, J.; Zhang, J.; Chen, H.; Jen, A. K.-Y. “Three-dimensional molecular donors combined with polymeric acceptors for high performance fullerene-free organic photovoltaic devices” J. Mater. Chem. A, 3, 22162-22169, 2015.

  73. Sulas, D. B.; Yao, K.; Intemann, J. J.; Williams, S. T.; Li, C.-Z.; Chueh, C.-C.; Richards, J. J.; Xi, Y.; Pozzo, L. D.; Schlenker, C. W.; Jen, A. K.-Y.; Ginger, D. S. “Open-Circuit Voltage Losses in Selenium-Substituted Organic Photovoltaic Devices from Increased Density of Charge-Transfer States” Chem. Mater., 27, 6583-6591, 2015.

  74. Lan, S.-C.; Chang, C.-K.; Lu, Y.-H.; Lin, S.-W.; Jen, A. K.-Y.; Wei, K.-H. “Side chain structure affects the molecular packing and photovoltaic performance of oligothiophene-based solution-processable small molecules” RSC Adv., 5, 67718-67726, 2015.

  75. Wu, C.-H.; Chueh, C.-C.; Xi, Y.-Y.; Zhong, H.-L.; Gao, G.-P.; Wang, Z.-H.; Pozzo, L. D.; Wen, T.-C.; Jen, A. K.-Y. “Influence of Molecular Geometry of Perylene Diimide Dimers and Polymers on Bulk Heterojunction Morphology Toward High-Performance Nonfullerene Polymer Solar Cells” Adv. Funct. Mater., 25, 5326-5332, 2015.

  76. Jung, J. W.; Chueh, C.-C.; Jen, A. K.-Y. “High-Performance Semitransparent Perovskite Solar Cells with 10% Power Conversion Efficiency and 25% Average Visible Transmittance Based on Transparent CuSCN as the Hole-Transporting Material” Adv. Energy Mater., 5, 201500486, 2015.

  77. Intemann, J. J; Yao, K.; Ding, F.; Xin, X.; Li, X.; Jen, A. K.-Y. “Enhanced Performance of Organic Solar Cells with Increased End Group Dipole Moment in Indacenodithieno[3,2-b]thiophene-Based Molecules” Adv. Funct. Mater., 25, 4889-4897, 2015.

  78. Zhong, H.; Li, C.-Z.; Carpenter, J.; Ade, H.; Jen, A. K.-Y. “Influence of Regio- and Chemo-selectivity on the Properties of Fluoro-Substituted Thienothiophene and Benzodithiophene Copolymers” J. Am. Chem. Soc., 137, 7616-7619, 2015.

  79. Wojciechowski, K.; Leijtens, T.; Spirova, S.; Schlueter, C.; Hoerantner, M.; Wang, J. T.-W.; Li, C.-Z.; Jen, A. K.-Y.; Lee, T.-L.; Snaith, H. J. “C60 as an Efficient N-Type Compact Layer in Perovskite Solar Cells” J. Phys. Chem. Lett., 6, 2399-2405, 2015.

  80. Huang, J.; Li, C.-Z.; Chueh, C.-C.; Liu, S.-Q.; Yu, J.-S.; Jen, A. K.-Y. “10.4% Power Conversion Efficiency of ITO-Free Organic Photovoltaics Through Enhanced Light Trapping Configuration” Adv. Energy Mater., 5, 201500406, 2015.

  81. Kim, J. H.; Jung, J. W.; Williams, S. T.; Liu, F.; Russell, T. P.; Jen, A. K.-Y. “Enhanced Crystalline Morphology of a Ladder-Type Polymer Bulk-Heterojunction Device by Blade-Coating” Nanoscale, 7, 10936-10939, 2015.

  82. Zuo, L.; Chang, C.-Y.; Chueh, C.-C.; Zhang, S.; Li, H.; Jen, A. K.-Y.; Chen, H. “Design of a Versatile Interconnecting Layer for highly Efficient Series-Connected Polymer Tandem Solar Cells” Energy Environ. Sci., 8, 1712-1718, 2015.

  83. Yang, Z.; Chueh, C.-C.; Zuo, F.; Kim, J. H.; Liang, P.-W.; Jen, A. K.-Y. “High-Performance Fully Printable Perovskite Solar Cells via Blade-Coating Technique under the Ambient Condition” Adv. Energy Mater., 5, 201500328, 2015.

  84. Jung, J. W.; Jo, J. W.; Chueh, C.-C.; Liu, F.; Jo, W. H.; Russell, T. P.; Jen, A. K.-Y. “Fluoro-Substituted n-Type Conjugated Polymers for Additive-Free All-Polymer Bulk Heterojunction Solar Cells with High Power Conversion Efficiency of 6.71%” Adv. Mater., 27, 3310-3317, 2015.

  85. Li, C.-Z.; Liang, P.-W.; Sulas, D. B.; Nguyen, P.; Li, X.; Ginger, D. S.; Schlenker, C. W.; Jen, A. K.-Y. “Modulate Hybrid Organic–Perovskite Photovoltaic Performance by Controlling the Excited Dynamics of Fullerenes” Mater. Horiz., 2, 414-419, 2015.

  86. Williams, S. T.; Chueh, C.-C.; Jen, A. K.-Y. “Navigating Organo-Lead Halide Perovskite Phase Space via Nucleation Kinetics toward a Deeper Understanding of Perovskite Phase Transformations and Structure–Property Relationships” Small, 11, 3088-3096, 2015.

  87. Tsai, K.-W.; Chueh, C.-C.; Williams, S. T.; Wen, T.-C.; Jen, A. K.-Y. “High-Performance Hole-Transporting Layer-Free Conventional Perovskite/Fullerene Heterojunction Thin-Film Solar Cells” J. Mater. Chem. A, 3, 9128-9132, 2015.

  88. Zang, Y.; Xu, Y.; Chueh, C.-C.; Li, C.-Z.; Chen, H.-C.; Wei, K.-H.; Yu, J.; Jen, A. K.-Y. “Photovoltaic Performance of Ladder-type Indacenodithieno[3,2-b]thiophene-Based Polymers with Alkoxyphenyl Side Chains” RSC Adv., 5, 26680-26685, 2015.

  89. Liu, S.-Y.; Wu, C.-H.; Li, C.-Z.; Liu, S.-Q.; Wei, K.-H.; Chen, H.-Z.; Jen, A. K.-Y. “A Tetraperylene Diimides Based 3D Nonfullerene Acceptor for Efficient Organic Photovoltaics” Adv. Sci., 2, 1500014, 2015.

  90. Liang, P.-W.; Chueh, C.-C.; Williams, S. T.; Jen, A. K.-Y. “Roles of Fullerene-Based Interlayers in Enhancing the Performance of Organometal Perovskite Thin-Film Solar Cells” Adv. Energy Mater., 5, 201402321, 2015.

  91. Li, C.-Z.; Yip, H.-L.; Jen, A. K.-Y. “Interfacial Materials for Efficient Solution Processable Organic Photovoltaic Devices, in Progress in High-Efficient Solution Process Organic Photovoltaic Devices” Springer, 2015.

  92. Zhao, B.; Li, C.-Z.; Liu, S.-Q.; Richards, J. J.; Chueh, C.-C.; Ding, F.; Pozzo, L. D.; Li, X.; Jen, A. K.-Y. “A Conductive Liquid Crystal via Facile Doping of an n-Type Benzodifurandione Derivative” J. Mater. Chem. A, 3, 6929-6934, 2015.

  93. Chueh, C.-C.; Li, C.-Z.; Jen, A. K.-Y. “Recent Progress and Perspective in Solution-Processed Interfacial Materials for Efficient and Stable Polymer and Organometal Perovskite Solar Cells” Energy Environ. Sci., 8, 1160-1189, 2015.

  94. Zhang, J.; Li, C.-Z.; Williams, S. T.; Liu, S.; Zhao, T.; Jen, A. K.-Y. “Crystalline Co-assemblies of Functional Fullerenes in Methanol with Enhanced Charge Transport” J. Am. Chem. Soc., 137, 2167-2170, 2015.

  95. Yao, K.; Xin, X.-K.; Chueh, C.-C.; Chen, K.-S.; Xu, Y.-X.; Jen, A. K.-Y. “Enhanced Light-Harvesting by Integrating Synergetic Microcavity and Plasmonic Effects for High-Performance ITO-Free Flexible Polymer Solar Cells” Adv. Funct. Mater., 25, 567-574, 2015.

  96. Kim, J. H.; Liang, P.-W.; Williams, S. T.; Cho, N.; Chueh, C.-C.; Glaz, M. S.; Ginger, D. S.; Jen, A. K.-Y. “High-Performance and Environmentally Stable Planar Heterojunction Perovskite Solar Cells Based on a Solution-Processed Copper-Doped Nickel Oxide Hole-Transporting Layer” Adv. Mater., 4, 695-701, 2015.

  97. Kim, J. H.; Williams, S. T.; Cho, N.; Chueh, C.-C.; Jen, A. K.-Y. “Enhanced Environmental Stability of Planar Heterojunction Perovskite Solar Cells Based on Blade-Coating” Adv. Energy Mater., 5, 1401229, 2015.

  98. Chueh, C.-C.; Liao, C.-Y.; Zuo, F.; Williams, S. T.; Liang, P.-W.; Jen, A. K.-Y. “The Roles of Alkyl Halide Additives in Enhancing Perovskite Solar Cell Performance” J. Mater. Chem. A, 3, 9058-9062, 2015.

  99. Liang, P.-W.; Chueh, C.-C.; Xin, X.-K.; Zuo, F.; Williams, S. T.; Liao, C.-Y.; Jen, A. K.-Y. “High-Performance Planar-Heterojunction Solar Cells Based on Ternary Halide Large-Band-Gap Perovskites” Adv. Energy Mater., 5, 1400960, 2015.

  100. Wojciechowski, K.; Stranks, S. D.; Abate, A.; Sadoughi, G.; Sadhanala, A.; Kopidakis, N.; Rumbles, G.; Li, C.-Z.; Friend, R. H.; Jen, A. K.-Y.; Snaith, H. J. “Heterojunction Modification for Highly Efficient Organic-Inorganic Perovskite Solar Cells” ACS Nano, 8, 12701-12709, 2014.

  101. Jung, J. W.; Williams, S. T.; Jen, A. K.-Y. “Low-Temperature Processed High-Performance Flexible Perovskite Solar Cells via Rationally Optimized Solvent Washing Treatment” RSC Advances, 4, 62971-62977, 2014.

  102. Li, Z.; Zang, Y.; Chueh, C.-C.; Cho, N.; Lu, J.; Wang, X.; Huang, J.; Li, C.-Z.; Yu, J.; Jen, A. K.-Y. “Tetrathienodibenzocarbazole Based Donor–Acceptor Type Wide Band-Gap Copolymers for Polymer Solar Cell Applications” Macromolecules, 47, 7407-7415, 2014.

  103. Williams, S. T.; Zuo, F.; Chueh, C.-C.; Liao, C.-Y.; Liang, P.-W.; Jen, A. K.-Y. “Role of Chloride in the Morphological Evolution of Organo-Lead Halide Perovskite Thin Films” ACS Nano, 8, 10640-10654, 2014.

  104. Yun, H. J.; Jung, D. Y.; Lee, D. K.; Jen, A. K.-Y.; Kim, J. H. “Panchromatic Quasi-Solid-State Squaraine Dye Sensitized Solar Cells Enhanced by Förster Resonance Energy Transfer of DCM-pyran” Dyes Pigment, 113, 675-681, 2014.

  105. Zuo, L.; Chueh, C.-C.; Xu, Y.-X.; Chen, K.-S.; Zang, Y.; Li, C.-Z.; Chen, H.; Jen, A. K.-Y. “Microcavity-Enhanced Light-Trapping for Highly Efficient Organic Parallel Tandem Solar Cells” Adv. Mater., 26, 6778-6784, 2014.

  106. Zuo, F.; Williams, S. T.; Liang, P.-W.; Chueh, C.-C.; Liao, C.-Y.; Jen, A. K.-Y. “Binary-Metal Perovskites Toward High-Performance Planar-Heterojunction Hybrid Solar Cells” Adv. Mater.,26, 6454-6460, 2014.

  107. Li, C.-Z.; Chang, C.-Y.; Zang, Y.; Ju, H.-X.; Chueh, C.-C.; Liang, P.-W.; Cho, N.; Ginger, D. S.; Jen, A. K.-Y. “Suppressed Charge Recombination in Inverted Organic Photovoltaics via Enhanced Charge Extraction by Using a Conductive Fullerene Electron Transport Layer” Adv. Mater., 26, 6262-6267, 2014.

  108. Karatay, D. U.; Salvador, M.; Yao, K.; Jen, A. K.-Y.; Ginger, D. S. “Performance limits of plasmon-enhanced organic photovoltaics” Appl. Phys. Lett., 105, 033304, 2014.

  109. Zang, Y.; Li, C.-Z.; Chueh, C.-C.; Williams, S. T.; Jiang, W.; Wang, Z.-H.; Yu, J.-S.; Jen, A. K.-Y. “Integrated Molecular, Interfacial, and Device Engineering towards High-Performance Non-Fullerene Based Organic Solar Cells” Adv. Mater., 26, 5708-5714, 2014.

  110. O’Malley, K. M.; Yip, H.-L.; Jen, A. K.-Y. “ Metal Oxide Interlayers for Polymer Solar Cells, in Organic Photovoltaics: Materials, Device Physics, and Manufacturing Technologies” Wiley-VCH, 2014.

  111. Liu, S.-Y.; Liu, W.-Q.; Xu, J.-Q.; Fan, C.-C.; Fu, W.-F.; Ling, J.; Wu, J.-Y.; Shi, M.-M.; Jen, A. K.-Y.; Chen, H.-Z. “Pyrene and Diketopyrrolopyrrole-Based Oligomers Synthesized via Direct Arylation for OSC Applications” ACS Appl. Mater. Interfaces, 6, 6765-6775, 2014.

  112. Wu, C.-H.; Chin, C.-Y.; Chen, T.-Y.; Guo, T.-F.; Lee, C.-H.; Lin, T.-L.; Jen, A. K.-Y.; Wen, T.-C. “Significance of ions with an ordered arrangement for enhancing the electron injection/extraction in polymer optoelectronic devices” J. Mater. Chem. C, 2, 4805-4811, 2014.

  113. Cho, N,; Schlenker, C. W.; Knesting, K. M.; Koelsch, P.; Yip, H.-L.; Ginger, D. S.; Jen, A. K.-Y. “High-Dielectric Constant Side-Chain Polymers Show Reduced Non-Geminate Recombination in Heterojunction Solar Cells” Adv. Energy Mater., 4, 1301857, 2014.

  114. Liang, P.-W.; Liao, C.-Y.; Chueh, C.-C.; Zuo, F.; Williams, S. T.; Xin, X.-K.; Lin, J.; Jen, A. K.-Y. “Additive Enhanced Crystallization of Solution-Processed Perovskite for Highly Efficient Planar-Heterojunction Solar Cells” Adv. Mater., 26, 3748-3754, 2014.

  115. Yao, K.; Salvador, M.; Chueh, C.-C.; Xin, X.-K.; Xu, Y.-X.; deQuilettes, D. W.; Hu, T.; Chen, Y.; Ginger, D. S.; Jen, A. K.-Y. “A General Route to Enhance Polymer Solar Cell Performance using Plasmonic Nanoprisms” Adv. Energy Mater., 4, 1400206, 2014.

  116. Zou, J.; Li, C.-Z.; Chang, C.-Y.; Yip, H.-L.; Jen, A. K.-Y. “Interfacial Engineering of Ultrathin Metal Film Transparent Electrode for Flexible Organic Photovoltaic Cells” Adv. Mater., 26, 3618-3623, 2014.

  117. Chen, K.-S.; Yip, H.-L.; Salinas, J.-F.; Xu, Y.-X.; Chueh, C.-C.; Jen, A. K.-Y. “Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration” Adv. Mater., 26, 3349-3354, 2014.

  118. Li, Y.; Yao, K.; Yip, H.-L.; Ding, F.-Z.; Xu, Y.-X.; Li, X.; Chen, Y.; Jen, A. K.-Y. “Eleven-Membered Fused-Ring Low Band-Gap Polymer with Enhanced Charge Carrier Mobility and Photovoltaic Performance” Adv. Funct. Mater., 24, 3631-3638, 2014.

  119. Tsai, K.-W.; Guo, T.-F.; Jen, A. K.-Y.; Wen, T.-C. “Role of self-assembled tetraoctylammonium bromide on various conjugated polymers in polymer light-emitting diodes” J. Mater. Chem. C, 2, 272-276, 2014.

  120. Chang, C.-Y.; Zuo, L.; Yip, H-L.; Li, C.-Z.; Li, Y.; Hsu, C.-S.; Cheng, Y.-J.; Chen, H.; Jen, A. K.-Y. “Highly Efficient Polymer Tandem Cells and Semitransparent Cells for Solar Energy” Adv. Energy Mater., 4, 1301645, 2014.

  121. Cho, N.; Li, C.-Z.; Yip, H.-L.; Jen, A. K.-Y. “In-situ Doping and Crosslinking of Fullerenes to Form Efficient and Robust Electron-Transporting Layer for Polymer Solar Cells” Energy Environ. Sci., 7, 638-643, 2014.

  122. Intemann, J. J.; Yao, K.; Li, Y.-X.; Yip, H.-L.; Xu, Y.-X.; Liang, P.-W.; Chueh, C.-C.; Ding, F.-Z.; Yang, X.; Li, X.; Chen, Y.; Jen, A. K.-Y. “Highly Efficient Inverted Organic Solar Cells Through Material and Interfacial Engineering of Indacenodithieno[3,2-b]thiophene-Based Polymers and Devices” Adv. Funct. Mater., 24, 1465-1473, 2014.

  123. Chueh, C.-C.; Yao, K.; Yip, A.; Chang, C.-Y.; Xu, Y.-X.; Chen, K.-S.; Li, C.-Z.; Huang, F.; Chen, Y.; Chen, W.-C.; Jen, A. K.-Y. “Non-Halogenated Solvents for Environmental Friendly Processing of High-performance Bulk-Heterojunction Polymer Solar Cells” Energy Environ. Sci., 6, 3241-3248, 2013.

  124. Chang, C.-Y.; Zuo, L.; Yip, H.-L.; Li, Y.; Li, C.-Z.; Hsu, C.-S.; Cheng, Y.-J.; Chen, H.; Jen, A. K.-Y. “A Versatile Fluoro-Containing Low-Bandgap Polymer for Efficient Semitransparent and Tandem Polymer Solar Cells” Adv. Funct. Mater., 23, 5084-5090, 2013.

  125. Rao, A.; Chow, P. C. Y.; Gelinas, S.; Schlenker, C. W.; Li, C.-Z.; Yip, H.-L.; Jen, A. K.-Y.; Ginger, D. S.; Friend, R. H. “The role of spin in the kinetic control of recombination in organic photovoltaics” Nature, 500, 435-439, 2013.

  126. Xu, Y.-X.; Chueh, C.-C.; Yip, H.-L.; Chang, C.-Y.; Liang, P.-W.; Intemann, J. J.; Chen, W.-C.; Jen, A. K.-Y. “Indacenodithieno[3,2-b]thiophene-based broad bandgap polymers for high efficiency polymer solar cells” Polym. Chem., 4, 5220-5223, 2013.

  127. Intemann, J. J.; Yao, K.; Yip, H.-L.; Xu, Y.-X.; Li, Y.-X.; Liang, P.-W.; Ding, F.-Z.; Li, X.; Jen, A. K.-Y. “Molecular Weight Effect on the Absorption, Charge Carrier Mobility, and Photovoltaic Performance of an Indacenodiselenophene-Based Ladder-Type Polymer” Chem. Mater., 25, 3188-3195, 2013.

  128. Abrusci, A.; Stanks, S. D.; Docampo, P.; Yip, H.-L.; Jen, A. K.-Y.; Snaith, H. J. “High-Performance Perovskite-Polymer Hybrid Solar Cells via Electronic Coupling with Fullerene Monolayers” Nano Lett., 13, 3124-3128, 2013.

  129. Cho, N.; Yip, H.-L.; Jen, A. K.-Y. “Morphology evolution by controlling solvent-solute interactions using a binary solvent in bulk heterojunction solar cells” Appl. Phys. Lett., 102, 233903, 2013.

  130. Li, Y.; Zou, J.; Yip, H.-L.; Li, C.-Z.; Zhang, Y.; Chueh, C.-C.; Intemann, J.; Xu, Y.; Liang, P.-W.; Chen, Y.; Jen, A. K.-Y. “Side-Chain Effect on Cyclopentadithiophene/Fluorobenzothiadiazole-Based Low Band Gap Polymers and Their Applications for Polymer Solar Cells” Macromolecules, 46, 5497-5503, 2013.

  131. Ji, W.; Jing, P.; Yuan, X.; Wang, Y.; Zhao, J.; Jen, A. K.-Y. “High color purity ZnSe/ZnS core/shell quantum dot based blue light emitting diodes with an inverted device structure” Appl. Phys. Lett., 103, 053106, 2013.

  132. Li, C.-Z.; Chueh, C.-C.; Ding, F.; Yip, H.-L.; Liang, P.-W.; Li, X.; Jen, A. K.-Y. “Doping of Fullerenes via Anion-Induced Electron Transfer and Its Implication for Surfactant Facilitated High Performance Polymer Solar Cells” Adv. Mater., 25, 4425-4430, 2013.

  133. Liu, S.-Y.; Shi, M.-M.; Huang, J.-C.; Jin, Z.-N.; Hu, X.-L.; Pan, J.-Y.; Li, H.-Y.; Jen, A. K.-Y.; Chen, H.-Z. “C–H activation: making diketopyrrolopyrrole derivatives easily accessible” J. Mater. Chem. A, 1, 2795-2805, 2013.

  134. Yang, J.; Yip, H.-L.; Jen, A. K.-Y. “Rational Design of Advanced Thermoelectric Materials” Adv. Energy Mater., 3, 549-565, 2013.

  135. Li, C.-Z.; Chueh, C.-C.; Yip, H.-L.; Ding, F.; Li, X.; Jen, A. K.-Y. “Solution-Processible Highly Conducting Fullerenes” Adv. Mater., 25, 2457-2461, 2013.

  136. Yang, X.; Chueh, C.-C.; Li, C.-Z.; Yip, H.-L.; Yin, p.; Chen, H.; Chen, W.-C.; Jen, A. K.-Y. “High-Efficiency Polymer Solar Cells Achieved by Doping Plasmonic Metallic Nanoparticles into Dual Charge Selecting Interfacial Layers to Enhance Light Trapping” Adv. Energy Mater., 3, 666-673, 2013.

  137. Chueh, C.-C.; Chien, S.-C.; Yip, H.-L.; Salinas, J. F.; Li, C.-Z.; Chen, K.-S.; Chen, F.-C.; Chen, W.-C.; Jen, A. K.-Y. “Toward High-Performance Semi-Transparent Polymer Solar Cells: Optimization of Ultra-Thin Light Absorbing Layer and Transparent Cathode Architecture” Adv. Energy Mater., 3, 417-423, 2013.

  138. Liu, S.-Y.; Shi, M.-M.; Huang, J.-C.; Jin, Z.-N.; Hu, X.-L.; Pan, J.-Y.; Li, H.-Y.; Jen, A. K.-Y.; Chen, H.-Z. “C–H activation: making diketopyrrolopyrrole derivatives easily accessible” J. Mater. Chem. A, 1, 2795-2805, 2013.

  139. Wu, C.-H.; Chin, C.-Y.; Chen, T.-Y.; Hsieh, S.-N.; Lee, C.-H.; Guo, T.-F.; Jen, A. K.-Y.; Wen, T.-C. “Enhanced performance of polymer solar cells using solution-processed tetra-n-alkyl ammonium bromides as electron extraction layers” J. Mater. Chem. A, 1, 2582-2587, 2013.

  140. Tsai, K.-W.; Hsieh, S.-N.; Guo, T.-F.; Hsu, Y.-J.; Jen, A. K.-Y.; Wen, T.-C. “Enhancing the hole injection ability of indium tin oxide via ammonium salts in polymer light-emitting diodes” J. Mater. Chem. C, 1, 531-535, 2013.

  141. Schlenker, C. W.; Chen, K-S.; Yip, H.-L.; Li, C.-Z.; Bradshaw, L. R.; Ochsenbein, S. T.; Ding, F.; Li, X. S.; Gamelin, D. R.; Jen, A. K.-Y.; Ginger, D. S. “Polymer Triplet Energy Levels Need Not Limit Photocurrent Collection in Organic Solar Cells” J. Am. Chem. Soc., 134, 19661-19668, 2012.

  142. Salinas, J.-F.; Yip, H.-Y.; Chueh, C.-C.; Li, C.-Z.; Maldonado, J.-L.; Jen, A. K.-Y. “Optical Design of Transparent Thin Metal Electrodes to Enhance In-Coupling and Trapping of Light in Flexible Polymer Solar Cells” Adv. Mater., 24, 6362-6367, 2012.

  143. Xu, Y.-X.; Chueh, C.-C.; Yip, H.-L.; Ding, F.-Z.; Li, Y.-X.; Li, C.-Z.; Li, X.; Chen, W.-C.; Jen, A. K.-Y. “Improved Charge Transport and Absorption Coefficient in Indacenodithieno[3,2-b]thiophene-based Ladder-Type Polymer Leading to Highly Efficient Polymer Solar Cells” Adv. Mater., 24, 6356-6361, 2012.

  144. Chen, K.-S.; Salinas, J.-F.; Yip, H.-L.; Huo, L.; Hou, J.; Jen, A. K.-Y. “Semi-transparent Polymer Solar Cells with 6% PCE, 25% Average Visible Transmittance and a Color Rendering Index Close to 100 for Power Generating Window Applications” Energy Environ. Sci., 5, 9551-9557, 2012. (Chosen as “Hot” EES article).

  145. Chen, K.-S.; Yip, H.-L.; Schlenker, C. W.; Ginger, D. S.; Jen, A. K.-Y. “Halogen-free Solvent Processing for Sustainable Development of High Efficiency Organic Solar Cells” Org. Electron., 13, 2870-2878, 2012.

  146. Zhang, Y.; Zou, J.; Chueh, C.-C.; Yip, H.-L.; Jen, A. K.-Y. “Significant Improved Performance of Photovoltaic Cells Made from a Partially Fluorinated Cyclopentadithiophene/Benzothiadiazole Conjugated Polymer” Macromolecules45, 5427-5435, 2012.

  147. Li, C.-Z.; Chueh, C.-C.; Yip, H.-L.; Chen, W.-C.; Jen, A. K.-Y. “Evaluation of Structure/Property Relationships of Solution-Processible Fullerene Acceptors and their n-Channel Field-Effect Transistor Performance” J. Mater. Chem., 22, 14976-14981, 2012.

  148. Grancini, G.; Kumar, R. S. S.; Abrusci, A; Yip, H.-L.; Li, C.-Z.; Jen, A. K.-Y.; Lanzani, G.; Snaith, H. J. “Boosting Infrared Light Harvesting by Molecular Functionalization of Metal Oxide/Polymer Interfaces in Efficient Hybrid Solar Cells” Adv. Funct. Mater., 22, 2160-2166, 2012.

  149. Zou, J; Yip, H.-L.; Zhang, Y.; Gao, Y.; Chien, S.-C.; O’Malley, K. M.; Chueh, C.-C.; Chen, H.; Jen, A. K.-Y. “High Performance Inverted Polymer Solar Cells: Device Characterization, Optical Modeling, and Hole-Transporting Modifications” Adv. Funct. Mater., 22, 2804-2811, 2012.

  150. Li, C.-Z., Chueh, C.-C., Yip, H.-L.; O’Malley K. M.; Chen, W.-C.; Jen, A. K.-Y. “Effective Interfacial Layer to Enhance Efficiency of Polymer Solar Cells via Solution-Processed Fullerene-Surfactants” J. Mater. Chem., 22, 8574-8578, 2012. (Selected as a Hot Article)

  151. Yip. H.-L.;  Jen, A. K.-Y. “Recent Advances in Solution-Processed Interfacial Materials for Efficient and Stable Polymer Solar Cells” Energy Environ. Sci., 5, 5994-6011, 2012. (Invited Feature Article, Most-Read EES article in Feb 2012)

  152. Li, C.-Z.; Yip, H.-L.; Jen, A. K.-Y. “Functional Fullerenes for Organic Photovoltaics” J. Mater. Chem., 22, 4161-4177, 2012. (Invited Feature Article, Top 10 Most-Read article in Feb 2012)

  153. Sun, Y.; Chien, S.-C.; Yip, H.-L.; Chen, K.-S.; Zhang, Y.; Davies, J. A.; Chen, F.-C.; Lin, B.; Jen, A. K.-Y. “Improved Thin Film Morphology and Bulk-Heterojunction Solar Cell Performance through Systematic Tuning of Surface Energy of Conjugated Polymers” J. Mater. Chem., 22, 5587-5595, 2012.

  154. Zeigler, D. F.; Chen, K.-S.; Yip, H.-L.; Zhang, Y.; Jen, A. K.-Y. “Tunable Light-Harvesting Polymers Containing Embedded Dipolar Chromophores for Polymer Solar Cell Applications” J. Polym. Sci., Part A: Polym. Chem., 50, 1362-1373, 2012.

  155. O’Malley, K. M, Li, C.-Z.; Yip, H.-L.; Jen, A. K.-Y. “Enhanced Open-Circuit Voltage in High Performance Polymer/Fullerene Bulk-Heterojunction Solar Cells by Cathode Modification with a C60 Surfactant” Adv. Energy Mater., 2, 82-86, 2012.

  156. Duan, C.; Hu, X.; Chen, K.-S.; Yip, H.-L.; Li, W.; Huang, F.; Jen, A. K.-Y.; Cao, Y. “Fully Visible-Light-Harvesting Conjugated Polymers with Pendant Donor-π-Acceptor Chromophores for Photovoltaic Applications” Sol. Energ. Mat. Sol. Cells, 97, 50-58, 2012.

  157. Sun, Y.; Chien, S.-C.; Yip, H.-L.; Zhang, Y.; Chen, K.-S.; Zeigler, D. F.; Chen, F.-C.; Lin, B.; Jen, A. K.-Y. “Chemically Doped and Cross-linked Hole-Transporting Materials as an Efficient Anode Buffer Layer for Polymer Solar Cells” Chem. Mater., 23, 5006-5015, 2011.

  158. Cho, N.; Yip, H.-L.; Davies, J. A.; Kazarinoff, P. D.; Zeigler, D. F.; Durban, M. M.; Segawa, Y.; O’Malley, K. M.; Luscombe, C. K.; Jen, A. K.-Y. “In-situ Crosslinking and n-Doping of Semiconducting Polymers and Their Application as Efficient Electron-Transporting Materials in Inverted Polymer Solar Cells”Adv. Energy Mater., 1, 1148-1153, 2011. (Highlighted article in Materials Views on Nov 4th 2010)

  159. Zhang, Y.; Chien, S.-C.; Chen, K.-S.; Yip, H.-L.; Sun, Y.; Davies, J. A.; Chen, F.-C.; Jen, A. K.-Y. “Increased Open Circuit Voltage in Fluorinated Benzothiadiazole-based Alternating Conjugated Polymers” Chem. Commun., 47, 11026-11028, 2011.

  160. Li, C.-Z.; Chien, S.-C.; Yip, H.-L.; Chueh, C.-C.; Chen, F.-C.; Matsuo, Y.; Nakamura, E.; Jen, A. K.-Y. “Facile Synthesis of a 56π-Electron 1,2-dihydromethano-[60]PCBM and Its Application for Thermally Stable Polymer Solar Cells”, Chem. Commun., 47, 10082-10084, 2011.

  161. Sun, Y.; Chien, S.-C.; Yip, H.-L.; Zhang, Y.; Chen, K.-S.; Zeigler, D. F.; Chen, F.-C.; Lin, B.; Jen, A. K.-Y. “High-Mobility Low-Bandgap Conjugated Copolymers Based on Indacenodithiophene and Thiadiazolo[3,4-c]pyridine Units for Thin Film Transistor and Photovoltaic Applications”, J. Mater. Chem., 21, 13247-13255, 2011.

  162. Zhang, Y.; Zou, J.; Yip, H.-L.; Chen, K.-S.; Davies, J. A.; Sun, Y.; Jen, A. K.-Y. “Synthesis, Characterization, Charge Transport, and Photovoltaic Properties of Dithienobenzoquinoxaline- and Dithienobenzopyridopyrazine-Based Conjugated Polymers” Macromolecules, 44, 4752-4758, 2011.

  163. Cho, N.; Yip, H.-L.; Hau, S. K.; Chen, K.-S.; Kim, T.-W.; Davies, J. A.; Zeigler, D. F.; Jen, A. K.-Y. “n-Doping of Thermally Polymerizable Fullerenes as an Electron Transporting Layer for Inverted Polymer Solar Cells”, J. Mater. Chem., 21, 6956-6961, 2011

  164. Zhang, Y.; Zou, J.; Yip, H.-L.; Chen, K.-S.; Zeigler, D. F.; Sun, Y.; Jen, A. K.-Y. “Indacenodithiophene and Quinoxaline-Based Conjugated Polymers for Highly Efficient Polymer Solar Cells”, Chem. Mater. , 23, 2289-2291, 2011. (Top 20 most downloaded articles in June 2011)

  165. Gao, Y.; Yip, H.-L.; Chen, K.-S.; O’Malley, K. M.; Acton, O.; Sun, Y.; Ting, G.; Chen, H.; Jen, A. K.-Y. “Surface Doping of Conjugated Polymers by Graphene Oxide and Its Application for Organic Electronic Devices”, Adv. Mater., 23, 1903-1908, 2011.

  166. Chen, K.-S.; Zhang, Y.; Yip, H.-L.; Sun, Y.; Davies, J. A.; Ting, C.; Chen, P.-C.; Jen, A. K.-Y. “Highly Efficient Indacenodithiophene-Based Polymeric Solar Cells in Conventional and Inverted Device Configurations”, Org. Electron., 12, 794-801, 2011.

  167. Tillack, A. F.; Noone, K. M.; MacLeod, B. A.; Nordlund, D.; Nagle, K. P.; Bradley, J. A.; Hau, S. K.; Yip, H.-L.; Jen, A. K.-Y.; Seidler, G. T.; Ginger, D. S. “Surface Characterization of Polythiophene:Fullerene Blends on Different Electrodes using Near Edge X-ray Absorption Fine Structure”, ACS Appl. Mater. Interfaces, 3, 726-732, 2011.

  168. Zhang, Y.;  Zou, J.; Yip, H.-L.; Sun, Y.; Davies, J. A.; Chen, K.-S.; Acton, O.; Jen, A. K.-Y. “Conjugated Polymers Based on C, Si and N-bridged Dithiophene and Thienopyrroledione Units: Synthesis, Field-Effect Transistors and Bulk Heterojunction Polymer Solar Cells” J. Mater. Chem., 21, 3895-3902, 2011.

  169. Wang, J.-Y.; Hau, S. K., Yip, H.-L.; Davies, J. A.; Chen, K.-S.; Zhang, Y.; Sun, Y.; Jen, A. K.-Y. “Benzobis(silolothiophene)-Based Low Bandgap Polymers for Efficient Polymer Solar Cells” Chem. Mater., 23, 765-767, 2011.

  170. Hau, S. K.; Yip, H.-L.; Chen, K.-S.; Zou, J.; Jen, A. K.-Y, “Solution Processed Inverted Tandem Polymer Solar Cells with Self-Assembled Monolayer Modified Interfacial Layers”, Appl. Phys. Lett., 97, 253307, 2010. (Also selected for publication in the Virtual Journal of Nanoscale Science and Technology)

  171. Hau, S. K.; O’Malley K. M.; Cheng, Y.-J.; Yip, H.-L.; Ma, H.; Jen, A. K.-Y. “Optimization of Active Layer and Anode Electrode for High-Performance Inverted Bulk-Heterojunction Solar Cells”, IEEE J. Sel. Top. Quantum Electron., 16, 1665-1675, 2010. (Invited article)

  172. Duan, C.; Chen, K.-S.; Huang, F.; Yip, H.-L.; Liu, S.; Zhang, J.; Jen, A. K.-Y.; Cao, Y. “Synthesis, Characterization, and Photovoltaic Properties of Carbazole-Based Two-Dimensional Conjugated Polymers with Donor-π-Bridge-Acceptor Side Chains” Chem. Mater., 22, 6444-6452, 2010.

  173. Gao, Y.; Yip, H.-L.; Hau, S. K.; O’Malley, K.; Cho, N.; Chen, H.; Jen, A. K.-Y. “Anode Modification of Inverted Polymer Solar Cells Using Graphene Oxide”Appl. Phys. Lett., 97, 203306, 2010.

  174. Sun, Y.; Gong, X.; Hsu, B. B. Y.; Yip, H.-L.; Jen, A. K.-Y.; Heeger, A. J. “Solution-Processed Cross-linked Hole Selective Layer for Polymer Solar Cells in the inverted Structure” Appl. Phys. Lett., 97, 193310, 2010.

  175. Hau, S. K.; Yip, H.-L.; Jen, A. K.-Y. “A Review on The Development of Inverted Polymer Solar Cells”, Polym. Rev., 50, 474-510, 2010. (Invited review)

  176. Hau, S. K.; Cheng, Y.-J.; Zhang, Y.; Yip, H.-L.; Ma, H.; Jen, A. K.-Y. “Effect of Chemical Modification of Fullerene-Based Self-Assembled Monolayers on the Performance of Inverted Polymer Solar Cells”, ACS Appl. Mater. Interfaces, 2, 1892-1902, 2010. (Top 20 most cited and most read articles for 2011 in ACS Applied Materials & Interfaces)

  177. Zou, J.; Yip, H.-L.; Hau, S. K.; Jen, A. K.-Y. “Metal Grid/Conducting Polymer Hybrid Transparent Electrode for Inverted Polymer Solar Cells” Appl. Phys. Lett., 96, 203301, 2010. (Top 20 most downloaded articles in year 2010)

  178. Ma, H.; Yip, H.-L.; Huang, F.; Jen, A. K.-Y. “Interface Engineering for Organic Electronics” Adv. Funct. Mater., 20, 1371-1388, 2010. (Rank #9 in Most Accessed Articles 8/2009-7/2010)

  179. Zhang, Y.; Hau, S. K.; Yip, H.-L.; Sun, Y.; Acton, O.; Jen, A. K.-Y. “Efficient Polymer Solar Cells Based on the Copolymers of Benzodithiophene and Thienopyrroledione” Chem. Mater., 22, 2696-2698, 2010. (Top 20 most cited articles for last 3 years in Chemistry of Materials)

  180. Cunningham, P. D.; Hayden, L. M.; Yip, H.-L.; Jen, A. K.-Y. “Charge Carrier Dynamics in Metalated Polymers Investigated by Optical-Pump Terahertz-Probe Spectroscopy”, J. Phys. Chem. B, 113, 15427-15432, 2009.

  181. Huang, F.; Chen, K.-S.; Yip, H.-L.; Hau, S. K.; Acton, O.; Zhang, Y.; Luo, J.; Jen, A. K.-Y. “Development of New Conjugated Polymers with Donor−π-Bridge−Acceptor Side Chains for High Performance Solar Cells” J. Am. Chem. Soc., 131, 13886-13887, 2009.

  182. Hau, S. K.; Yip, H.-L.; Zou, J.; Jen, A. K.-Y. “Indium tin oxide-free semi-transparent inverted polymer solar cells using conducting polymer as both bottom and top electrodes” Org. Electron., 10, 1401-1407, 2009.

  183. Zhang, Y.; Yip, H.-L.; Acton, O.; Hau, S. K.; Huang, F.; Jen, A. K.-Y.. “A Simple and Effective Way of Achieving Highly Efficient and Thermally Stable Bulk-Heterojunction Polymer Solar Cells Using Amorphous Fullerene Derivatives as Electron Acceptor“, Chem. Mater., 21, 2598-2600, 2009.

  184. Hau, S. K.; Yip, H.-L.; K. Leong; Jen, A. K.-Y. “Spraycoating of Ag nanoparticle electrodes for inverted polymer solar cells” Org. Electron., 10, 719-723, 2009.

  185. Hau, S. K.; Yip, H.-L.; Baek, N. S., Ma, H.; Jen, A. K.-Y. “Interfacial Modification to Improve Inverted Polymer Solar Cells” J. Mater. Chem., 18, 5113-5119, 2008.

  186. Hau, S. K.; Yip, H.-L.; Ma, H.; Jen, A. K.-Y. “High Performance Ambient Processed Inverted Polymer Solar Cells through Interfacial Modification with a Fullerene Self-Assembled Monolayer” Appl. Phys. Lett., 93, 233304, 2008. (Top 20 most downloaded articles in Dec. 2008)

  187. Baek, N. S., Hau, S. K. Yip, H.-L.; Chen, K.-S.; Acton, O.; Jen, A. K.-Y. “High Performance Amorphous Metallated p-Conjugated Polymers for Field-Effect Transistors and Polymer Solar Cells” Chem. Mater., 20, 5734-5736, 2008. (Top 20 most cited articles for last 3 years in Chemistry of Materials)

  188. Hau, S. K.; Yip, H.-L.; Baek, N. S., Zou, J.; O’Malley, K.; Jen, A. K.-Y. “Air-Stable Inverted Flexible Polymer Solar Cells Using Zinc Oxide Nanoparticles as an Electron Selective Layer” Appl. Phys. Lett., 92, 253301, 2008. (Top 20 most downloaded articles in June & July 2008)

  189. Yip, H.-L.; Hau, S. K.; Baek, N. S.; Ma, H.; Jen, A. K.-Y. “Polymer Solar Cells That Use Self Assembled-Monolayer-Modified ZnO/Metals as Cathodes” Adv. Mater., 20, 2376-2382, 2008.

  190. Yip, H.-L.; Hau, S. K.; Baek, N. S.; Jen, A. K.-Y. “Self-Assembled Monolayer Modified ZnO/Metal Bilayer Cathodes for Polymer:Fullerene Bulk-Heterojunction Solar Cells” Appl. Phys. Lett., 92, 193313, 2008.

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