Fig. 4: The analysis of PL mechanism in bulk crystal and microstructure of MAPbBr3. | Nature Communications

Fig. 4: The analysis of PL mechanism in bulk crystal and microstructure of MAPbBr3.

From: Anisotropic carrier dynamics and laser-fabricated luminescent patterns on oriented single-crystal perovskite wafers

Fig. 4

a The SEM and FM images of the processed MAPbBr3 (001) wafer under different scanning speeds. b Schematic diagram of femtosecond laser defocus processing (470 µm before focus). c–e The front-view and back-view colored 3D profile images of LSCM and corresponding magnifying SEM images at different processing scanning speeds. f Micro-PL spectra of processed MAPbBr3 at different scanning speeds. g, h Binding energy spectra and the corresponding analytical fitting for MAPbBr3 crystals before and after laser processing. i, j Pseudo color TA plots before and after laser processing with a low excitation carrier density of 1.45 × 1016 cm−3. k, l TA spectra before and after laser processing at different delay time. m, n Flat-band energy level diagram for illustration of different relaxation pathways of the photocarriers in unprocessed (m) and processed (n) MAPbBr3 crystals. o Schematic diagram of PL driven by structural change before and after processing of MAPbBr3.

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