期刊
CHEMSUSCHEM
卷 9, 期 18, 页码 2699-2707出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600999
关键词
non-stoichiometric; perovskite; solar cells; stability; water vapor
资金
- German Federal Ministry of Education and Research (BMBF) [0SF0516B]
- Bavarian Ministry of the Environment and Consumer Protection
- Bavarian Network Solar Technologies Go Hybrid
- DFG Excellence Cluster Nanosystems Initiative Munich (NIM)
- European Union
- UK Engineering and Physical Sciences Research Council [EP/J002305/1, EP/M025020/1, EP/G037515/1, EP/M014797/1]
- EPSRC [EP/J002305/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1365265, EP/J002305/1] Funding Source: researchfish
We investigated the influence of moisture on methylammonium lead iodide perovskite (MAPbI(3)) films and solar cells derived from non-stoichiometric precursor mixtures. We followed both the structural changes under controlled air humidity through insitu X-ray diffraction, and the electronic behavior of devices prepared from these films. A small PbI2 excess in the films improved the stability of the perovskite compared to stoichiometric samples. We assign this to excess PbI2 layers at the perovskite grain boundaries or to the termination of the perovskite crystals with Pb and I. In contrast, the MAI-excess films composed of smaller perovskite crystals showed increased electronic disorder and reduced device performance owing to poor charge collection. Upon exposure to moisture followed by dehydration (so-called solvent annealing), these films recrystallized to form larger, highly oriented crystals with fewer electronic defects and a remarkable improvement in photocurrent and photovoltaic efficiency.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据