الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
LaxZn1-xS (x = 2, 3, 4and 5 mol%) films were synthesized by sol-gel method. The La-doped ZnS films structure and electrical transport behavior were investigated. XRD and TEM revealed that the films are polycrystalline and have hexagonal wurtzite structure. Absorption, transmittance, reflectance and FTIR spectra were investigated. The dc conductivity data were explained in terms of two different polaronic models as a function of temperature range. In high temperature region above θD/2, Mott model of SPH between the nearest neighbors is consistent with the dc conductivity data, while at intermediate temperature the Greaves VRH model was found to be appropriate. Dc conductivity indicates that the maximum was found for x = 2 mol% which can be attributed to the grain size reduction. The ZnS nano-particles exciton resonance absorption band edge of the La-doped ZnS samples provides possibility for improving the complete elimination of toxic water pollutants where it characterizes by electron-hole pair rapid generation. The measured semi-log I - V characteristics of the Al/Zn1-xLaxS/p-Si/Al heterojunctions for analyzing the charge transport and photoconducting mechanism. Finally, the La-doped ZnS nanocrystalline films provide possibility for improving the photocatalytic behavior of ZnS and for solar energy applications.