锡
材料科学
卤化物
钙钛矿(结构)
微观结构
能量转换效率
晶界
图层(电子)
光电子学
相(物质)
化学工程
纳米技术
冶金
无机化学
化学
有机化学
工程类
作者
Binbin Yu,Zhenhua Chen,Yudong Zhu,Yiyu Wang,Bing Han,Guocong Chen,Xusheng Zhang,Zheng Du,Zhubing He
标识
DOI:10.1002/adma.202102055
摘要
Abstract 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.
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