真空热蒸发LiF钝化策略制备高效稳定的钙钛矿太阳能电池

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中图分类号：TM914.4 文献标识码：ADOI：10.37188/CJL.20250142 CSTR：32170.14.CJL.20250142

Abstract：Perovskite solar cells（PSCs）demonstrate outstanding photoelectric conversion eficiency（PCE），yet their performance remainsconstrained bysurface defects atthe perovskite/electron transport layer（ETL）interface， whichsignificantly impede electron transport.Thisstudy innovatively introduces aLiFinterlayerbetweenperovskite andETL through vacuum thermal evaporation.The research reveals that F- inLiFchemically interactswith uncoordinated Pb²+defects on the perovskite surface，forming stable Pl Fbonds that effectively passivate surface defects. This strategy enhances the film'ssurface morphologyand substantially improves interfacial electron transport effciency.Experimental results show that LiF-passivated PSCs achievea PCE increase from 21.21% to22. 33% ，accompanied by significantly reduced hysteresis index（HI）.During accelerated aging tests at 60 ∘C ，LiF-modified devices exhibit exceptional stability，retaining 85% of their initial efficiencyafter 82O h of aging.This simple，reliable，and scalable interfacialengineering strategy providesnew insights fordeveloping high-eficiencyand stable PSCs.

Keywords：perovskite solarcells；vacuum thermal evaporation；interfacial defect passivatio

1引言

钙钛矿材料优异的光电特性，如高吸光系数、超长载流子扩散长度和可调带隙等优势，使其迅速崛起，成为光伏领域的研究热点[-3]。（剩余12268字）