Electron injection and defect passivation for high-efficiency mesoporous perovskite solar cells

• 成果类型: Article
• 署名作者: Liu, Jiale; Chen, Xiayan; Chen, Kaizhong; Tian, Wenming; Sheng, Yusong; She, Bin; Jiang, Youyu; Zhang, Deyi; Liu, Yang; Qi, Jianhang; Chen, Kai; Ma, Yongmin; Qiu, Zexiong; Wang, Chaoyang; Yin, Yanfeng; Zhao, Shengli; Leng, Jing; Jin, Shengye; Zhao, Wenshan; Qin, Yanyang; Su, Yaqiong; Li, Xiaoyu; Li, Xiaojiang; Zhou, Yang; Zhou, Yinhua; Ling, Furi; Mei, Anyi; Han, Hongwei
• 署名单位: Huazhong University of Science & Technology; Wuhan Institute of Technology; Chinese Academy of Sciences; Dalian Institute of Chemical Physics, CAS; Xi'an Jiaotong University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10611
• DOI: 10.1126/science.adk9089
• 发表日期: 2024-03-15
• 页码: 1198-1204
• 关键词: oxygen vacancies; soft acids; transport; hard; diffusion; bases; tio2

摘要

Printable mesoscopic perovskite solar cells (p-MPSCs) do not require the added hole-transport layer needed in traditional p-n junctions but have also exhibited lower power conversion efficiencies of about 19%. We performed device simulation and carrier dynamics analysis to design a p-MPSC with mesoporous layers of semiconducting titanium dioxide, insulating zirconium dioxide, and conducting carbon infiltrated with perovskite that enabled three-dimensional injection of photoexcited electrons into titanium dioxide for collection at a transparent conductor layer. Holes underwent long-distance diffusion toward the carbon back electrode, and this carrier separation reduced recombination at the back contact. Nonradiative recombination at the bulk titanium dioxide/perovskite interface was reduced by ammonium phosphate modification. The resulting p-MPSCs achieved a power conversion efficiency of 22.2% and maintained 97% of their initial efficiency after 750 hours of maximum power point tracking at 55 +/- 5(degrees)C.