Fig. 1: Physico-chemical characterization of CuSCN-NP.
From: Moisture resistance in perovskite solar cells attributed to a water-splitting layer
a Representative TEM image of CuSCN-NP from water dispersion employing keratin as surfactant and b size distribution measured by DLS, with TEM image at high magnification in the inset showing the presence ofsignificantly thin platelets within the sample. c XPS characterization of CuSCN-NP: top left, Cu 2p3/2 XPS peak with fitted Cu(I)SCN component (blue); top center, Cu LMM Auger spectrum; top right, N 1s XPS spectrum fitted with SCN (blue) and thiourea (green) component; bottom left, C 1s XPS region with aliphatic (blue), SCN (green), thiourea (violet), carboxylate (ochre) components; bottom center, S 2p region with the main doublet assigned to SCN and thiourea (2p3/2 blue, 2p1/2 green), and the satellite doublet corresponding to oxidized sulfur (violet and ochre); bottom right, XPS valence band spectrum with red dashed lines indicating the valence band onset.
