甲脒
钙钛矿(结构)
材料科学
光伏
带隙
能量转换效率
太阳能电池
相(物质)
制作
光电子学
化学工程
化学
光伏系统
结晶学
电气工程
工程类
病理
有机化学
医学
替代医学
作者
Pengwei Li,Xiaolong Liu,Yiqiang Zhang,Chao Liang,Gangshu Chen,Fengyu Li,Meng Su,Guichuang Xing,Xiaofeng Tao,Yanlin Song
标识
DOI:10.1002/anie.202000460
摘要
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-1 Snn I3n+1 . The broadness of the (BEA)FA2 Sn3 I10 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)FA2 Sn3 I10 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)FA2 Sn3 I10 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.
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