Performance analysis of electrochromic coloration efficiency by the oxygen deficiency in the sputtering a-WOx films

Jyh-Jier Ho; Jia-Show Ho; Sheng-Shih Wang; Kang L. Wang

doi:10.1117/12.2022662

25 September 2013 Performance analysis of electrochromic coloration efficiency by the oxygen deficiency in the sputtering a-WO_x films

Jyh-Jier Ho, Jia-Show Ho, Sheng-Shih Wang, Kang L. Wang

Author Affiliations +

Proceedings Volume 8847, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII; 884718 (2013) https://doi.org/10.1117/12.2022662
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

In this paper, we report on how electrochromic coloration is affected by oxygen deficient stoichiometries in amorphous tungsten oxide (a-WO_x) films prepared by a dc reactive magnetron sputtering. The peak color efficient (CE) value of oxygen partial pressure at the optimum 6.5×10^-3 Torr is improved about nine-fold larger than that of 2.0×10-3 Torr even in the nearly stoichiometric a-WO_x films. We attributed that the optical absorption of a colored a-WOx film can be satisfactorily described by an intervalence charge-transfer transition (ICTT) mechanism between localized W⁵⁺ and W⁶⁺ states. Therefore, we have determined the most suitable condition (by increasing the partial oxygen pressure) to produce a-WO_x films, thus offering a good electrochromic performance for opto-switching applications.

Citation Download Citation

Jyh-Jier Ho, Jia-Show Ho, Sheng-Shih Wang, and Kang L. Wang "Performance analysis of electrochromic coloration efficiency by the oxygen deficiency in the sputtering a-WO_x films", Proc. SPIE 8847, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII, 884718 (25 September 2013); https://doi.org/10.1117/12.2022662

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