【摘 要】
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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-band
【机 构】
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National Laboratory of Solid State Microstructures,Jiangsu Key Laboratory of Artificial Functional M
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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,V4\'-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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