Cross-linked hole transport layers for high-efficiency perovskite tandem solar cells

• 作者: Yurui Wang Shuai Gu Guoliang Liu Liping Zhang Zhou Liu Renxing Lin Ke Xiao Xin Luo Jianhua Shi Junling Du Fanying Meng Ludong Li Zhengxin Liu Hairen Tan
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（11）
• 所属期刊栏目: ARTICLES
• 页码范围: 2025-2034
• 页数: 10页
• 语种: 英文

摘要

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.