【摘要】 钙钛矿太阳能电池（PSCs）具有出色的光电转换效率（PCE）,但其性能仍受限于钙钛矿/电子传输层（ETL）界面处的表面缺陷,这些缺陷会严重阻碍电子传输。本文创新性地采用真空热蒸发法在钙钛矿与ETL之间引入LiF中间层。研究表明,LiF中的F^-能够与钙钛矿表面的未配位Pb²⁺缺陷发生相互作用,形成稳定的Pb—F键,从而实现对表面缺陷的高效钝化。该策略改善了薄膜的表面形貌,使界面电子传输效率得到显著提升。实验结果表明,经LiF钝化的PSCs的PCE从21.21%提升至22.33%,同时器件迟滞指数（HI）明显降低。在60℃下进行加速老化测试时,LiF钝化的器件展现出优异的稳定性,经过820 h老化后仍能保持85%的初始效率。这项简单可靠、可规模化制备的界面工程策略为开发高效、稳定的PSCs提供了新的思路。更多还原

【Abstract】 Perovskite solar cells（PSCs） demonstrate outstanding photoelectric conversion efficiency（PCE）,yet their performance remains constrained by surface defects at the perovskite/electron transport layer（ETL） interface,which significantly impede electron transport.This study innovatively introduces a LiF interlayer between perovskite and ETL through vacuum thermal evaporation.The research reveals that F in LiF chemically interacts with uncoordinated Pb²⁺ defects on the perovskite surface,forming stable Pb—F bonds that effectively passivate surface defects.This strategy enhances the film ’ s surface morphology and substantially improves interfacial electron transport efficiency.Experimental results show that LiF-passivated PSCs achieve a PCE increase from 21.21% to 22.33%,accompanied by significantly reduced hysteresis index（HI）.During accelerated aging tests at 60℃,LiF-modified devices exhibit exceptional stability,retaining 85% of their initial efficiency after 820 h of aging.This simple,reliable,and scalable interfacial engineering strategy provides new insights for developing high-efficiency and stable PSCs.更多还原