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- Title
Low‐Dimensional Dion–Jacobson‐Phase Lead‐Free Perovskites for High‐Performance Photovoltaics with Improved Stability.
- Authors
Li, Pengwei; Liu, Xiaolong; Zhang, Yiqiang; Liang, Chao; Chen, Gangshu; Li, Fengyu; Su, Meng; Xing, Guichuan; Tao, Xutang; Song, Yanlin
- Abstract
1,4‐butanediamine (BEA) is incorporated into FASnI3 (FA=formamidinium) to develop a series of lead‐free low‐dimensional Dion–Jacobson‐phase perovskites, (BEA)FAn−1SnnI3n+1. The broadness of the (BEA)FA2Sn3I10 band gap appears to be influenced by the structural distortion owing to high symmetry. The introduction of BEA ligand stabilizes the low‐dimensional perovskite structure (formation energy ca. 106 j mol−1), which inhibits the oxidation of Sn2+. The compact (BEA)FA2Sn3I10 dominated film enables a weakened carrier localization mechanism with a charge transfer time of only 0.36 ps among the quantum wells, resulting in a carrier diffusion length over 450 nm for electrons and 340 nm for holes, respectively. Solar cell fabrication with (BEA)FA2Sn3I10 delivers a power conversion efficiency (PCE) of 6.43 % with negligible hysteresis. The devices can retain over 90 % of their initial PCE after 1000 h without encapsulation under N2 environment.
- Subjects
SOLAR cell design; CHARGE carrier lifetime; PHOTOVOLTAIC power generation; CHARGE transfer; QUANTUM wells
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 17, p6976
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202000460