Fig. 2: Structure characterization of PtSA/Cs2SnI6.

a Low-magnification and b high-magnification HAADF-STEM images, and c the corresponding STEM-EDS elemental mapping of PtSA/Cs2SnI6. d Pt L3-edge XANES spectra and corresponding K3-weighted FT spectra at e R space and g k-space of PtSA/Cs2SnI6, PbI2 and Pt foil. XANES f R space and h k-space fitting curves of PtSA/Cs2SnI6. i High-resolution XPS Pt 4f spectrum of PtSA/Cs2SnI6.