Abstract
Perovskite tandem solar cells have recently received extensive attention due to their promise of achieving power conversion efficiency (PCE) beyond the limits of single-junction cells. However, their performance is still largely constrained by the wide-bandgap perovskite solar cells which show considerable open-circuit voltage (VOC) losses. Here, we increase the VOC and PCE of wide-bandgap perovskite solar cells by changing the hole transport layer (HTL) from commonly used poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) to in-situ cross-linked small molecule N4,N4′-di(naphthalen-1-yl)-N4,N4′-bis(4-vinylphenyl) biphenyl-4,4′-diamine (VNPB). The stronger interaction and lower trap density at the VNPB/perovskite interface improve the PCE and stability of wide-bandgap perovskite solar cells. By using the cross-linked HTL for front wide-bandgap subcells, PCEs of 24.9% and 25.4% have been achieved in perovskite/perovskite and perovskite/silicon tandem solar cells, respectively. The results demonstrate that cross-linkable small molecules are promising for high-efficiency and cost-effective perovskite tandem photovoltaic devices.
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Acknowledgements
This work is financially supported by the National Key R&D Program of China (2018YFB1500102), the National Natural Science Foundation of China (61974063, 22005139), Natural Science Foundation of Jiangsu Province (BK20202008, BK20190315), Fundamental Research Funds for the Central Universities (0205/14380252) and Program for Innovative Talents and Entrepreneur in Jiangsu. The work in SIMIT is supported by the National Natural Science Foundation of China (62074153), Strategic Priority Research Program of Chinese Academy of Sciences (XDA17020403), Science and Technology Commission of Shanghai (19DZ1207602 and 20DZ1207103). We are grateful to the High Performance Computing Center (HPCC) of Nanjing University for doing the numerical calculations in this work on its blade cluster system.
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Wang, Y., Gu, S., Liu, G. et al. Cross-linked hole transport layers for high-efficiency perovskite tandem solar cells. Sci. China Chem. 64, 2025–2034 (2021). https://doi.org/10.1007/s11426-021-1059-1
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DOI: https://doi.org/10.1007/s11426-021-1059-1