Comparison of electrochromic amorphous and crystalline tungsten oxide films |
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Authors: | Esra Ozkan Se-Hee Lee C Edwin Tracy J Roland Pitts Satyen K Deb |
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Affiliation: | a National Renewable Energy Laboratory, Golden, CO 80401, USA;b Faculty of Science and Letters, Department of Physics, Istanbul Technical University, Maslak, Istanbul 80626, Turkey |
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Abstract: | A detailed systematic study of the tungsten oxide thin films has been carried out using WO3 films after they were annealed at progressively increasing temperatures ranging from 350°C to 450°C in oxygen environments. The structural properties of the films were characterized using X-ray diffraction and Raman spectroscopy. The amorphous WO3 films remain as an amorphous phase up to 385°C and begin to crystallize at 390°C and then are completely crystallized at 450°C. Absorption peaks of the films are found to shift to a higher energy side with increasing annealing temperature up to 385°C and then shift abruptly to a lower energy as the films begin to crystallize at 390°C. Deconvolution of the absorption spectra shows that there are two different polaron transitions in the amorphous WO3 films. |
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Keywords: | Tungsten oxide Thermal evaporation Electrochromism |
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