期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 2, 页码 1011-1018出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00005
关键词
perovskite solar cell; morphology; degradation; humidity; GISANS
资金
- TUM.solar
- Excellence Cluster Nanosystems Initiative Munich (NIM) - German Research Foundation (DFG, Deutsche Forschungsgemeinschaft)
- Center for NanoScience (CeNS)
- Federal Ministry of Education and Research (BMBF, Bundesministerium fur Bildung und Forschung) [03SF0516A/B, 03SF0514A/B]
- Engineering and Physical Science Research council (EPSRC) [EP/P03148X/1]
- EPSRC [EP/P03148X/1] Funding Source: UKRI
To increase the moisture stability of hybrid perovskite photovoltaics, a combination of three-dimensional (3D) and a thin layer of two-dimensional (2D) perovskite incorporating long-chained organic cations is often employed as photoabsorber. However, the detailed interaction between water and 3D/2D perovskite heterojunctions has not been elucidated yet. Using in situ neutron and X-ray scattering techniques, we reveal surprisingly strong water uptake into 3D/2D perovskite films despite the presence of hydrophobic bulky cations. Our results show rapid disproportionation of the initial 2D phase (number of layers, m = 5) in methylammonium lead iodide (MAPI)/2D films into lower m phases under humidity. Nevertheless, the 2D perovskite inhibits the irreversible PbI2 formation, which suggests that the suppression of land MA(+) ion migration and consequently of MAI escape is related to the improved moisture stability of MAPI/2D perovskite films. In comparison, quadruple-cation perovskites including Rb+ exhibit poor stability toward phase segregation upon exposure to moisture regardless of the 2D perovskite layer.
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