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An intriguing reversible band gap narrowing behavior of the lead‐free hybrid perovskite single crystal DMASnI3 (DMA=CH3NH2CH3+) from yellow to black is observed without phase transformation. We discuss the transformation mechanism in detail. More interestingly, the transformed samples in black can rapidly self‐heal into yellow ones when exposed to deionized water (DI water). Contrary to other hybrid...
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