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Low‐Dimensional Dion–Jacobson‐Phase Lead‐Free Perovskites for High‐Performance Photovoltaics with Improved Stability
Author(s) -
Li Pengwei,
Liu Xiaolong,
Zhang Yiqiang,
Liang Chao,
Chen Gangshu,
Li Fengyu,
Su Meng,
Xing Guichuan,
Tao Xutang,
Song Yanlin
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000460
Subject(s) - formamidinium , band gap , materials science , fabrication , perovskite (structure) , photovoltaics , energy conversion efficiency , phase (matter) , optoelectronics , solar cell , chemical engineering , chemistry , crystallography , photovoltaic system , electrical engineering , medicine , alternative medicine , pathology , engineering , organic chemistry
1,4‐butanediamine (BEA) is incorporated into FASnI 3 (FA=formamidinium) to develop a series of lead‐free low‐dimensional Dion–Jacobson‐phase perovskites, (BEA)FA n −1 Sn n I 3 n +1 . The broadness of the (BEA)FA 2 Sn 3 I 10 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. 10 6 j mol −1 ), which inhibits the oxidation of Sn 2+ . The compact (BEA)FA 2 Sn 3 I 10 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)FA 2 Sn 3 I 10 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 N 2 environment.