Amorphous (lysine)2PbI2 layer enhanced perovskite photovoltaics
Yehui Wen, Tianchi Zhang, Xingtao Wang, Tiantian Liu, Yu Wang, Rui Zhang, Miao Kan, Li Wan, Weihua Ning, Yong Wang, Deren Yang, Yong Wang, Deren Yang
Abstract
Abstract Passivation materials play a crucial role in a wide range of high-efficiency, high-stability photovoltaic applications based on crystalline silicon and state-of-the-art perovskite materials. Currently, for perovskite photovoltaic, the mainstream passivation strategies routinely rely on crystalline materials. Herein, we have invented a new amorphous (lysine) 2 PbI 2 layer-enhanced halide perovskite. By utilizing a solid phase reaction between PbI 2 and lysine molecule, an amorphous (lysine) 2 PbI 2 layer is formed at surface/grain boundaries in the perovskite films. The amorphous (lysine) 2 PbI 2 with fewer dangling bonds can effectively neutralize surface/interface defects, achieving an impressive efficiency of 26.27% (certified 25.94%). Moreover, this amorphous layer not only reduces crystal lattice stress but also functions as a barrier against the decomposition of organic components, leading to suppressed de-structuring of perovskite and highly stable perovskite solar cells.