Fig. 1: Optical, structural and compositional analysis of the phase segregation of MAPb(BrxI1-x)3 (x = 0.905) single crystal. | Communications Materials

Fig. 1: Optical, structural and compositional analysis of the phase segregation of MAPb(BrxI1-x)3 (x = 0.905) single crystal.

From: Energy-band gradient structure originated from longitudinal phase segregation of mixed halide perovskite single crystal

Fig. 1

a XRD patterns of the sample before and after phase segregation. The inset shows the magnified spectrum around 29°. The bottom panel shows the reference powder XRD patterns for MAPbI3 and MAPbBr3. b UV-vis absorption spectra of the sample before and after phase segregation. c PL evolution during phase segregation, extracted from region 1 which is labelled in the inset confocal map of crystal surface. d Schematics showing a longitudinally gradient perovskite structure and the SEM-EDS analysis results of phase segregated sample, obtained using incident electrons of two energies. The energy deposition of 5 kV and 15 kV electrons obtained from simulation is also shown. e, f Evolution of I 3d and Br 3d XPS spectra with etch time. g The quantified percentage of two halide ions obtained from XPS spectra at different etch time.

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