Fig. 1: Effects of CdAc2 on perovskite grains and films. | Nature Communications

Fig. 1: Effects of CdAc2 on perovskite grains and films.

From: Synergistic passivation and stepped-dimensional perovskite analogs enable high-efficiency near-infrared light-emitting diodes

Fig. 1

a Schematic diagram of defect passivation on the FAPbI3 perovskite grain surface by CdAc2. b Scanning electron microscope (SEM) image of a FAPbI3 perovskite film with 2.5% CdAc2, the scale bar for the image is 1 μm. Inset: a HAADF-STEM image of a perovskite grain extracted from the CdAc2-added FAPbI3 without 5AVA. Energy-dispersive spectrum (EDS) mapping images of c O and d Cd, the scale bars for these images are 20 nm. e Density of states (DOS) of an un-passivated and passivated surface with Cd2+ or Ac−. Kelvin probe force microscopy (KPFM) images of the films f without and g with CdAc2.

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