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CHNHI, PbI and CHNHPbI films were fabricated by evaporation and characterized with X-ray Photoelectron Spectroscopy (XPS) and X-ray diffraction (XRD). The XPS results indicate that the PbI and CHNHPbI films are more uniform and stable than the CHNHI film. The atomic ratio of the CHNHI, PbI and CHNHPbI films are C:N:I=1.00:1.01:0.70, Pb:I= 1.00:1.91 and C: N: Pb: I = 1.29:1.07:1.00:2.94, respectively. The atomic ratio of CHNHPbI is very close to that of the ideal perovskite. Small angle x-ray diffraction results demonstrate that the as evaporated CHNHPbI film is crystalline. The valence band maximum (VBM) and work function (WF) of the CHNHPbI film are about 0.85eV and 4.86eV, respectively.


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