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Characterization of MHHPs. a) The crystal structure of MHHPs. b) The digital photos of synthesized MHHPs series MAPb(Br x I1‐ x )3 (x = 0, 0.17, 0.5, 0.75, 1). c) The HRTEM images of MHHPs pieces and the corresponding fast Fourier transform spots of MAPbI3 and MAPb(Br0.5I0.5)3 show the single‐crystalline nature. d) The powder X‐ray diffraction (PXRD) patterns of the MAPb(Br x I1‐ x )3 (x = 0, 0.17, 0.5, 0.75, 1) indicate the phase evolution from cubic to tetragonal phase.
