Fig. 1: Chelation characterization and moisture tolerance study. | Nature Communications

Fig. 1: Chelation characterization and moisture tolerance study.

From: Surface chelation of cesium halide perovskite by dithiocarbamate for efficient and stable solar cells

Fig. 1

a Atomic structure of optimized CsPbI2Br (001) surface with Pb(DDTC)2 molecule. b ToF-SIMS depth profile of the CsPbI2Br perovskite (PVK) film with Pb(DDTC)2 (chelated CsPbI2Br), measured in negative polarity. The measured film was structured as glass/FTO/c-TiO2/perovskite. The concentration of Pb(DDTC)2 used for the chelated sample is 0.015 M. c FTIR spectra of Pb(DDTC)2 (purple) and chelated CsPbI2Br (gray) samples. The concentration of Pb(DDTC)2 and CsPbI2Br perovskite in precursor solution are 0.02 and 1.0 M, respectively. C–N stretching and C–S stretching were highlighted by blue and green colored dotted line, respectively. d Evolution of normalized absorbance for pristine (green) and chelated (purple, Pb(DDTC)2) CsPbI2Br thin films under dark in ambient atmosphere (RH, 15 ± 3%). Absorption intensities at the wavelength of 400 nm were extracted from the UV–Vis absorption spectra of CsPbI2Br films. Insets are the photographs of pristine and chelated CsPbI2Br films after exposure to ambient air for 70 and 95 days, respectively.

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