DOI: 10.1126/science.adk9089 ISSN: 0036-8075

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

Jiale Liu, Xiayan Chen, Kaizhong Chen, Wenming Tian, Yusong Sheng, Bin She, Youyu Jiang, Deyi Zhang, Yang Liu, Jianhang Qi, Kai Chen, Yongmin Ma, Zexiong Qiu, Chaoyang Wang, Yanfeng Yin, Shengli Zhao, Jing Leng, Shengye Jin, Wenshan Zhao, Yanyang Qin, Yaqiong Su, Xiaoyu Li, Xiaojiang Li, Yang Zhou, Yinhua Zhou, Furi Ling, Anyi Mei, Hongwei Han
  • Multidisciplinary

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°C.

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