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.
Original language | English |
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Pages (from-to) | 439-448 |
Number of pages | 10 |
Journal | Solar Energy Materials and Solar Cells |
Volume | 79 |
Issue number | 4 |
DOIs | |
Publication status | Published - 30 Sept 2003 |
Keywords
- Electrochromism
- Thermal evaporation
- Tungsten oxide