Fig. 6: Defect dynamics in mixed-halide perovskite solar cells.
From: Local halide heterogeneity drives surface wrinkling in mixed-halide wide-bandgap perovskites
a Device configuration. b, c Sensitive external quantum efficiency (EQE) spectra of perovskite solar cells with different absorber layers. b Br content (y) = 0.40 and MA content (x) = 0.25, 0.50, and 0.75. c MA content (x) = 0.75 and Br content (y) = 0.40, 0.50, and 0.60. Shaded region in c represents the sub-bandgap EQE spectrum for the {x/y} = 0.25|0.40 composition. d–h Band-edge and sub-bandgap photocurrent response in the 0.80–2.10 eV range for solar cells using absorber layers for different compositions. Lines represent the spectra of pristine solar cells and open circles represent the spectra acquired after 10 min of continuous illumination (532 nm, 1-Sun equivalent intensity). Dashed vertical lines in d–h indicate the respective optical bandgaps. d {x/y} = 0.25|0.40. e {x/y} = 0.50|0.40. f {x/y} = 0.75⁞0.40. g {x/y} = 0.75⁞0.50. h {x/y} = 0.75⁞0.60.
