Fig. 1
From: Formamidinium lead iodide perovskite photovoltaics with MoS2 quantum dots
XPS spectrums for FAPI 1.5 film showing (a) Pb 4f showing Pb2+and Pb3+(FAPI) peaks, (b) I 3d orbital showing FAPI related peaks, (c) O 1 s orbital, (d) C 1 s orbital and (e) Mo 3d/S 2 s orbital. The XPS spectrums for drop-casted MoS2 QDs showing (f) Mo 3d orbital and (g) S 2p orbitals.
