Fig. 4: Strain distribution and stability measurements.
From: Ultrastable and efficient slight-interlayer-displacement 2D Dion-Jacobson perovskite solar cells
a, b GIXRD spectra at different tilt angles for the PDMA- and CDMA-based film, respectively. c Linear fit of 2θ-sin2φ in the different regions for the PDMA- and CDMA-based film. d, e XRD patterns of films exposed in a constant temperature humidity chamber with relative humidity (RH) of 85–90% under dark at room temperature. Inset: Comparison of the fresh perovskite films and after aging. f Dynamic dissolving process of a water droplet on the surface of PDMA- and CDMA-based DJ perovskite films. Inset: Contact angles of the water droplets on perovskite films.
