Fig. 3: Characterization of the nominal n = 5 perovskite films.
From: Ultrastable and efficient slight-interlayer-displacement 2D Dion-Jacobson perovskite solar cells
a, b SEM images of the PDMA- and CDMA-based perovskite films, respectively. c, d GIWAXS images of the DJ perovskite films. e, g TA spectra under different delay times for the PDMA film under back- and front-photoexcitation. f, h TA spectra under different delay times for the CDMA film under back- and front-photoexcitation.
