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(a) CsPbCl3 grown with purified materials. (b) CsPbCl3 grown with non-purified materials. (c) CsPbBr3 grown with non-purified materials. (d) CsPbBr3 grown with purified materials. (e) CsPbBr3 wafers cut transversely. (f) CsPbBr3 samples cut longitudinally and transversely.
