Fig. 5
a Steady-state PL spectra. b TRPL spectra. c Cross-section image of an MAPbIxBr3 − x film. d, e EDS mapping images of I and Br elements in the area marked in (c), respectively. f, g Relative intensity of I and Br element based on (d) and (e) images along the longitudinal direction. h Cross-sectional image of a G-MAPbIxBr3 − x film. i, j EDS mapping images of I and Br elements in the area marked in (h), respectively. k, l Relative intensity of I and Br element based on (i) and (j) images along the longitudinal direction