钝化
材料科学
钙钛矿(结构)
氟化锂
光伏
离子键合
卤化物
太阳能电池
锂(药物)
化学工程
降级(电信)
光电子学
热稳定性
光降解
无机化学
纳米技术
光伏系统
图层(电子)
离子
化学
催化作用
有机化学
生态学
计算机科学
光催化
内分泌学
工程类
生物
电信
医学
作者
Alan Jiwan Yun,Jinhyun Kim,Bumjin Gil,Hyungsub Woo,Ki‐Min Park,Jaemin Cho,Byungwoo Park
标识
DOI:10.1021/acsami.0c14218
摘要
Because of the facile formation of defects in organometal halide perovskites, the defect passivation has become an important prerequisite for the stable and efficient perovskite solar cell (PSC). Regarding that ionic defects of the perovskites play a significant role on the performance and stability of PSCs, we introduce lithium fluorides as effective passivators based on their strong ionic characteristics and small ionic radii. Both Li+ and F- are observed to successfully incorporate within the perovskite layer, improving the device performances with the best efficiency over 20%, while the hysteresis effects are significantly reduced, confirming the passivation of perovskite defects. Moreover, LiF restrains both thermal degradation and photodegradation of PSCs, where over 90% of the initial efficiencies have been retained by LiF-incorporated devices for more than 1000 h under either 1 sun illumination or 85 °C thermal condition. As the trap density of states is analyzed before and after the thermal stress, not only the mitigation of electronic traps as fabricated but also the dramatic relaxation of traps during the postannealing step is observed with the LiF incorporation. From this work, LiF has shown its potential as a promising ionic passivator, and the phenomenal achievement of device stability by LiF provides a clear insight to overcome the stability issues of PSCs, a key to the commercialization of next-generation photovoltaics.
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