Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 10, Pages 6967-6972Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01335
Keywords
hybrid organic-inorganic perovskites; photoluminescence; confocal microscopy; spectroscopy; ion migration
Funding
- Spanish Ministry of Economy and Competitiveness [MAT2017-88584-R]
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The spectacular advances in efficiency of optoelectronic devices based on lead-halide perovskites have been accompanied by detailed structural and optical studies regarding the instability presented by these materials, which constitute their main bottleneck for commercialization. Following a pump and probe scheme in a laser scanning confocal microscope, we resolve the photoinduced emission activation/deactivation dynamics in CH3NH3PbBr3 single crystals with millisecond and sub-micrometer resolution. This is complemented with a study of spectral variations and interpreted in the framework of light-induced ion migration and associated defect passivation. Our results point to the presence of photoinduced structural changes accompanying the migration of ions.
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