Phase transformation from PbS to PbSe:S in hot-wall deposition of nanocomposite thin film with evaporation sources of PbS and ZnSe

Abstract Simultaneous evaporation of PbS and ZnSe using hot-wall deposition was investigated to prepare nanocomposite thin films. X-ray diffraction patterns indicated that the films formed a phase mixture PbSe, suggesting an source phase-transformed PbSe during film deposition. Wavelength-dispersive spectroscopy composite contains small amount S below 1 at.%. High-angle annular dark-field scanning transmission electron microscopy line scan analysis in energy-loss nanocrystals were dispersed ZnSe, while tended segregate matrix. Photocurrent spectra peak position at approximately 460 nm shifted toward shorter wavelength as Pb concentration increased.