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Darroudi N, Eshghi H. Influence of substrate temperatures on the structural, optical and electrical properties of nanostructured V2O5 thin films prepared by spray pyrolysis technique. ICOP & ICPET _ INPC _ ICOFS 2018; 24 :153-156
URL: http://opsi.ir/article-1-1647-en.html
URL: http://opsi.ir/article-1-1647-en.html
1- Department of Physics, Shahrood University of Technology
Abstract: (1977 Views)
In this research, vanadium pentoxide thin films were grown at various substrate temperatures (300˚C, 350˚C and 400˚C) by spray pyrolysis technique. The SEM images showed that with increasing the substrate temperature, the density and the size of the nano-grains are increased from 50 to 100 nm. Also the analysis of EDX data confirmed the presence of oxygen and vanadium elements in layers in such a way that with increasing the growth temperature the oxygen vacancies also increased. The XRD results revealed that the samples have changed from amorphous phase (at the growth temperature of 300 ºC) to orthorhombic polycrystalline structure with preferred orientation of (001) at higher temperatures. The analysis of absorbance spectra showed that with increasing the substrate temperature the direct band gaps of the samples are decreased from 2.59 to 2.41 eV. These variations are well compatible with the EDX and also I-V data, based on the variations of band tail width, in these samples.
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