All-inorganic CsPbI3 perovskite quantum dots (QDs) offer higher efficiency and better mechanical stability than other quantum dot materials for photovoltaic applications. This paper demonstrates a hybrid interfacial architecture (HIA) using a CsPbI3 QD/PCBM heterojunction, creating an energy cascade for efficient charge transfer and improved mechanical adhesion. A champion CsPbI3 QD solar cell achieved 15.1% efficiency (stabilized power output of 14.61%), among the highest reported. Flexible quantum dot photovoltaics using this strategy reached 12.3% efficiency.

Long Hu, Qian Zhao, Shujuan Huang, Jianghui Zheng, Xinwei Guan, Robert Patterson, Jiyun Kim, Lei Shi, Chun-Ho Lin, Qi Lei, Dewei Chu, Wan Tao, Soshan Cheong, Richard D. Tilley, Anita W. Y. Ho-Baillie, Joseph M. Luther, Jianyu Yuan, Tom Wu