钙钛矿(结构)
氯化胆碱
能量转换效率
卤化物
钝化
化学
热稳定性
化学工程
氯化物
氯喹
离子液体
盐(化学)
材料科学
无机化学
催化作用
有机化学
光电子学
工程类
图层(电子)
作者
Bo Yang,Puan Lin,Tingwei Zhou,Xiaojia Zheng,Bing Cai,Wenhua Zhang
标识
DOI:10.1016/j.cclet.2023.109425
摘要
Defects at the surface and grain boundaries of the perovskite films are extremely detrimental to both the efficiency and stability of perovskite solar cells (PSCs). Herein, a simple and stable quaternary ammonium halide, named chlormequat chloride (i.e., chlorinated choline chloride, CCC), is introduced to regulate the upper surface chemical environment of perovskite films. The anion (Cl−) and cation [ClCH2CH2N(CH3)3]+ in CCC could effectively self-search and passivate positively and negatively charged ionic defects in perovskites, respectively, which contributes to inhibited nonradiative recombination and reduced energy loss in PSCs. As a result, the champion power conversion efficiency (PCE) of PSCs can be significantly enhanced from 22.82% to 24.07%. Moreover, the unencapsulated device with CCC modification retains 92.0% of its original PCE even subject to thermal aging at 85 °C for 2496 h. This work provides guidance for the rational design of functional molecules as defect passivators in PSCs, which is beneficial for the improvements in both device performance and stability.
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