甲脒
三碘化物
钙钛矿(结构)
材料科学
钝化
离子键合
亚稳态
半导体
硅
载流子寿命
薄脆饼
三卤化物
晶体缺陷
化学物理
相(物质)
化学工程
纳米技术
无机化学
光电子学
化学
离子
结晶学
卤化物
物理化学
图层(电子)
有机化学
工程类
电解质
色素敏化染料
电极
作者
Shaun Tan,İlhan Yavuz,Marc H. Weber,Tianyi Huang,Chung-Hao Chen,Rui Wang,Hao-Cheng Wang,Jeong Hoon Ko,Selbi Nuryyeva,Jingjing Xue,Yepin Zhao,Kung‐Hwa Wei,Jin‐Wook Lee,Yang Yang
出处
期刊:Joule
[Elsevier BV]
日期:2020-09-23
卷期号:4 (11): 2426-2442
被引量:249
标识
DOI:10.1016/j.joule.2020.08.016
摘要
Shallow defects are mostly benign in covalent semiconductors, such as silicon, given that they do not constitute non-radiative recombination sites. In contrast, the existence of shallow defects in ionic perovskite crystals might have significant repercussions on the long-term stability of perovskite solar cells (PSCs) because of the metastability of the ubiquitous formamidinium lead triiodide (FAPbI3) perovskite and the migration of charged point defects. Here, we show that shallow iodine interstitial defects (Ii) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation. We demonstrate that concurrently avoiding the generation of Ii and the more effective passivation of iodine vacancies (VI) can improve the thermodynamic stability of the films and operational stability of the PSCs. Our most stable PSC retained 92.1 % of its initial performance after nearly 1,000 h of continuous illumination operational stability testing.
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