Low‐Dimensional Dion–Jacobson‐Phase Lead‐Free Perovskites for High‐Performance Photovoltaics with Improved Stability

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2020-04, Vol.59 (17), p.6909-6914
Main Authors: Li, Pengwei, Liu, Xiaolong, Zhang, Yiqiang, Liang, Chao, Chen, Gangshu, Li, Fengyu, Su, Meng, Xing, Guichuan, Tao, Xutang, Song, Yanlin
Format: Article
Language:English
Subjects:
Charge transfer
Diffusion length
Dion–Jacobson phase
Energy conversion efficiency
Fabrication
Free energy
Heat of formation
Lead
lead-free perovskites
Localization
low-dimensional perovskites
Oxidation
Perovskite structure
Perovskites
Photovoltaic cells
Photovoltaics
Quantum wells
Solar cells
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Summary: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. A low‐dimensional DJ: A Dion–Jacobson‐phase lead‐free perovskite, (BEA)FAn−1SnnI3n+1 (BEA=1,4‐butanediamine, FA=formamidinium), is used to fabricate perovskite solar cells. The representative (BEA)FA2Sn3I10 perovskite exhibits excellent optical absorption and carrier transport, resulting in a record power conversion efficiency of 6.43 %.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202000460