钝化
结晶
钙钛矿(结构)
材料科学
Crystal(编程语言)
载流子寿命
化学工程
晶体生长
聚合物
相对湿度
薄膜
纳米技术
光电子学
化学
图层(电子)
复合材料
结晶学
热力学
计算机科学
硅
工程类
程序设计语言
物理
作者
Jiamin Chen,Junying Sun,Bowen Shi,Junbo Gong,Qing Dai,Feiyu Zhao,Weiping Li
标识
DOI:10.1016/j.jallcom.2023.171423
摘要
Polymer has been widely used for modifications in perovskite films. However, its comprehensive and complex mechanism is still lack of in-depth research. This work presents the possible mechanism for crystal growth in perovskite films under passivation circumstance. Through the crystallization and carrier dynamics analysis we establish an island-crystal growth model with low concentration precursor solution, it predicts that the curve of additive weight ratio versus film performance will reach a peak value and then decline to a mediocre level. We further set several experiment groups and test this hypothesis with a series of characterizations. For the optoelectronic performance, passivation enhances the photosensitivity (Ilight/Idark) to ∼1020%. The aging test under an elevated relative humidity (85%) demonstrates the passivated devices extend the lifetime to 96 h, which is 3 times higher than the reference group. In addition, the encapsulated group shows a really stable performance in 240 h storage, indicating polymer passivation has a great potential for suppressing ion migration effect in the perovskite material.
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