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In article number 1703451, direct evidence of bromine migration in CH3NH3PbBr3 single crystals under electric‐field cycles is reported by David P. Fenning and co‐workers, using nanoprobe X‐ray fluorescence. Photoluminescence mapping reveals that the crystal has higher emission in regions with higher local bromine concentration. This link between ion migration and optoelectronic quality reveals the...
Optoelectronic devices based on hybrid perovskites have demonstrated outstanding performance within a few years of intense study. However, commercialization of these devices requires barriers to their development to be overcome, such as their chemical instability under operating conditions. To investigate this instability and its consequences, the electric field applied to single crystals of methylammonium...
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