Thin Solid Films, Vol.258, No.1-2, 86-90, 1995
Growth and Characterization of Polycrystalline InSe Thin-Films
Indium selenide films were obtained by the thermal evaporation of undoped crystals at substrate temperatures of 210 and 300 IC. Films were found to exhibit n-type conductivity. Scanning electron microscopy established that the films grown on glass substrates held at 210 degrees C had an atomic content of In46.66Se53.34, whereas the films obtained under the same conditions and annealed in vacuum at 150 degrees C had an atomic content of In48.13Se51.87. X-Ray diffraction indicated that the films were polycrystalline in nature and crystallized in the D-3h(1) space group. From an analysis of Hall and conductivity measurements, performed in the temperature ranges 110-320 K and 10-320 K respectively, thermionic emission is considered to be the predominant transport mechanism above 200 K. The current transport below 75 K is due to the hopping of carriers between localized states. In the intermediate temperature region, both thermally assisted tunnelling and thermionic emission contribute to the conduction.
Keywords:INDIUM SELENIDE;ELECTRICAL-PROPERTIES;HOPPING CONDUCTION;OPTICAL-PROPERTIES;CDS FILMS;EVAPORATION;SCATTERING;BARRIERS