期刊
ACS PHOTONICS
卷 3, 期 6, 页码 947-952出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00290
关键词
cathodoluminescence; CH3NH3PbI3-xBrx perovskite; single crystal; transmission electron microscopy; EDS mapping
类别
资金
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation (SNSF) [154853]
- Swiss confederation under the Swiss Government Scholarship Programme
- King Abdullah Institute for Nanotechnology, Deanship of Scientific Research, King Saud University, Riyadh, Saudi Arabia
Probing local emission properties of organic-inorganic lead halide perovskite material can provide evidence regarding the photovoltaic performance of perovskite solar cells. Herein, cathodoluminescence, which has the potential to resolve emission characteristics in the nanoregime, has been exploited to carry out temperature-dependent studies on individual well-faceted CH3NH3PbI3-xBrx perovskite single crystals. The spatial distribution of emission recorded at 4 and 300 K reveals that the periphery of the perovskite crystals radiates predominantly, which establishes that such an unusual emission characteristic is independent of the crystallographic phase of CH3NH3PbI3-xBrx crystals. Investigation based on scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy deduces that the asymmetric cathodoluminescence is associated with the nonhomogeneous distribution of methylammonium cations in CH3NH3PbI3-xBrx single crystals. These results emphasize the unraveling of a correlation between the composition and spectroscopic properties of perovskite crystals in the nanoregime, which eventually can influence the overall photovoltaic performance of the devices based on them.
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