钙钛矿(结构)
化学
卤化物
串联
碱金属
合金
化学工程
能量转换效率
插层(化学)
微观结构
铵
盐(化学)
离子
沉积(地质)
无机化学
纳米技术
结晶学
物理化学
材料科学
光电子学
复合材料
有机化学
古生物学
工程类
生物
沉积物
作者
Xiaoyan Yu,Qin Zhou,Jianbin Xu,Lusheng Liang,Xiaobing Wang,Jihuai Wu,Peng Gao
标识
DOI:10.1002/ejic.202001109
摘要
Abstract As univalent cation to the ammonium ions, alkali metal ions become vital alternatives or additives for the A‐site ions of lead halide perovskites. They were reported to construct new perovskite structures or bring new features like reduced defect density, suppressed hysteresis, improved power conversion efficiencies (PCEs), stability, etc. In this work, by making an alloyed film of PbI 2 :KI in the first step of the sequential deposition, we find that a low concentration of KI can improve the roughness and microstructure of the PbI 2 film, facilitating the intercalation of ammonium salt into PbI 2 . In comparison, a higher concentration of KI will lead to the formation of K 2 PbI 4 clusters, resulting in perovskite films with decreased quality and high V OC loss in devices. The best‐performing device based on one PbI 2 :KI alloy shows an enhanced PCE from 19.60 % to 21.18 %. The study can provide a referential insight into the influence of K + on the formation of perovskite films and the performance of corresponding devices.
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