Fig. 3: Structural characterization of polycrystalline thin films with dark–light–dark cycle.
From: Strain-activated light-induced halide segregation in mixed-halide perovskite solids
a XRD patterns for 35%Br perovskite film under dark and light. The light source is a white-light LED with an intensity of approximately 100 mW cm−2. The XRD of “Dark recovery” was measured after the LED light was off for approximately 3 min. b Analysis on full width at half maximum (FWHM) for the XRD peaks with dark–light–dark cycle. XRD peak change (c) and FWHM change (d) for 65%Br perovskite film.
