Journal article

Improving Molecular Planarity by Changing Alky Chain Position Enables 12.3% Efficiency All-Small-Molecule Organic Solar Cells with Enhanced Carrier Lifetime and Reduced Recombination

Xiyue Dong, Ke Yang, Hua Tang, Dingqin Hu, Shanshan Chen, Jun Zhang, Zhipeng Kan, Tainan Duan, Chao Hu, Xuexin Dai, Zeyun Xiao, Kuan Sun, Shirong Lu

Solar RRL | Wiley-Blackwell | Published : 2020

Abstract

Molecular stacking plays an important role in defining the active layer morphology in all‐small‐molecule organic solar cells (ASM OSCs). However, the precise control of donor/acceptor stacking to afford optimal phase separation remains challenging. Herein, the molecular stacking of a small‐molecule donor is tuned by changing the alky chain position to match a high‐performance small‐molecule nonfullerene acceptor (NFA), Y6. The alky chain engineering not only affects the planarity of the small‐molecule donor, but also the molecular aggregation and the active layer morphology, and thus the photovoltaic performance. Notably, single‐junction ASM OSCs with 12.3% power conversion efficiency (PCE) ..

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University of Melbourne Researchers

Grants

Awarded by National Youth Thousand Program Project


Awarded by National Natural Science Foundation of China


Awarded by CAS Pioneer Hundred Talents Program B


Awarded by National Special Funds for Repairing and Purchasing Scientific Institutions


Awarded by Natural Science Foundation of Chongqing


Awarded by "Artificial Intelligence" Key Project of Chongqing


Awarded by Key Laboratory of Low-grade Energy Utilization Technologies and Systems


Awarded by Venture & Innovation Support Program for Chongqing Overseas Returnees


Awarded by Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies


Funding Acknowledgements

X.D. and K.Y. contributed equally to this work. This work was financially supported by research grants from the National Youth Thousand Program Project (R52A199Z11), National Natural Science Foundation of China (61504015 and 21801238), CAS Pioneer Hundred Talents Program B (Y92A010Q10), National Special Funds for Repairing and Purchasing Scientific Institutions (Y72Z090Q10), the Natural Science Foundation of Chongqing (cstc2017jcyjA0752, cstc2018jcyjAX0556, cstc2017jcy-jAX0384, and cstc2018jszx-cyzdX0137), the "Artificial Intelligence" Key Project of Chongqing (No. cstc2017rgzn-zdyfX0030), the Key Laboratory of Low-grade Energy Utilization Technologies and Systems (LLEUTS-2017004 and LLEUTS-2019001), the Venture & Innovation Support Program for Chongqing Overseas Returnees (cx2017034), and Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies (Grant No. JJNY201909). The author gratefully appreciates Xiaofan Zheng (UCAS), Shuai Li (TJU), Ya Wang (UCAS), Ruilu Guo (BUCT), Hongfang Li (UPC), Yuhui Yang (CIGIT), and De Guo (CIGIT) for their help on instrument characterizations.