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Heterogeneous 2D/3D Tin‐Halides Perovskite Solar Cells with Certified Conversion Efficiency Breaking 14%
Author(s) -
Yu BinBin,
Chen Zhenhua,
Zhu Yudong,
Wang Yiyu,
Han Bing,
Chen Guocong,
Zhang Xusheng,
Du Zheng,
He Zhubing
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202102055
Subject(s) - tin , materials science , halide , microstructure , perovskite (structure) , energy conversion efficiency , grain boundary , layer (electronics) , phase (matter) , chemical engineering , nanotechnology , optoelectronics , metallurgy , inorganic chemistry , organic chemistry , chemistry , engineering
As the most promising lead‐free one, tin‐halides based perovskite solar cells still suffer from the severe bulk‐defect due to the easy oxidation of tin from divalent to tetravalent. Here, a general and effective strategy is delivered to modulate the microstructure of 2D/3D heterogeneous tin‐perovskite absorber films by substituting FAI with FPEABr in FASnI 3 . The introduction of 2D phase can induce highly oriented growth of 3D FASnI 3 and it is revealed in the optimal 2D/3D film that 2D phase embraces 3D grains and locates at the surfaces and grain boundaries. The FPEA + based 2D tin‐perovskite capping layer can offer a reducing atmosphere for vulnerable 3D FASnI 3 grains. The unique microstructure effectively suppresses the well‐known oxidation from Sn 2+ to Sn 4+ , as well as decreasing defect density, which leads to a remarkable enhanced device performance from 9.38% to 14.81% in conversion efficiency. The certified conversion efficiency of 14.03% announces a new record and moves a remarkable step from the last one (12.4%). Besides of this breakthrough, this work definitely paves a new way to fabricate high‐quality tin‐perovskite absorber film by constructing effective 2D/3D microstructures.