Tungsten oxide (WO3) is one of the most promising materials for electrochromic devices. WO3 thin films have been prepared at low temperature by using a polyethylene glycol (PEG) assisted sol–gel method. The structure and the stoichiometry of films deposited by dip coating on glass substrates have been studied as a function of thermal annealing by XRD, FTIR and l-Raman. PEGcontaining samples show improved electrochromic efficiency due to the formation of sub-stoichiometric, nanocrystalline phases. The electrochromic performance of WO3 films gets worse for annealing temperatures higher than 300C due to massive Na absorption from the substrate.
WO3 thin films by sol-gel for electrochromic applications / Cremonesi, A.; Bersani, Danilo; Lottici, Pier Paolo; Djaoued, Y.; Ashrit, P. V.. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - 345-346:(2004), pp. 500-504. [10.1016/j.jnoncrysol.2004.08.073]
WO3 thin films by sol-gel for electrochromic applications
BERSANI, Danilo;LOTTICI, Pier Paolo;
2004-01-01
Abstract
Tungsten oxide (WO3) is one of the most promising materials for electrochromic devices. WO3 thin films have been prepared at low temperature by using a polyethylene glycol (PEG) assisted sol–gel method. The structure and the stoichiometry of films deposited by dip coating on glass substrates have been studied as a function of thermal annealing by XRD, FTIR and l-Raman. PEGcontaining samples show improved electrochromic efficiency due to the formation of sub-stoichiometric, nanocrystalline phases. The electrochromic performance of WO3 films gets worse for annealing temperatures higher than 300C due to massive Na absorption from the substrate.| File | Dimensione | Formato | |
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