Efficient Charge Collection Promoted by Interface Passivation Using Amino Acid Toward High Performance Perovskite Solar Cells

• DOI: 10.1002/pssr.201800505
• Publication Date: 2018-11-26T07:40:32Z
• Authors: Wenwen Zhang; Xiaoli Lei; Jihong Liu; Jun Dong; Xuewen Yan; Wei Gao; Hua Dong; Chenxin Ran; Zhaoxin Wu
• Keywords: Passivation; Triiodide; Carrier lifetime

Interfacial modification of organolead halide perovskites (OHPs) has shown to be a promising strategy improve the quality OHPs film. In this work, bipolar amino acid molecule, L‐Leucine (LL), have been introduced anti‐solvent solution induce formation methylammonium lead triiodide (MAPbI 3 ) perovskite films. The morphology, crystal structure, and optoelectronic property films are systematically studied, where LL plays key role. By employing LL‐modified film, solar cells (PSCs) well prepared. Consequently, 18.2% efficiency was obtained from champion device, which showed significant improvement compared controlled device with PCE 16.1%. Our results demonstrate crucial role feature interfacial agent on charge transfer at interface, provide important concept efficient PSCs. Moreover, significantly improved stability can observed modified devices, benefiting effectively trap‐passivation.