Structural and optical characterization of amorphous and crystalline evaporated WO3 layers

被引：70

作者：

Antonaia, A ^{[1
]}

Polichetti, T ^{[1
]}

Addonizio, ML ^{[1
]}

Aprea, S ^{[1
]}

Minarini, C ^{[1
]}

Rubino, A ^{[1
]}

机构：

[1] ENEA Ctr Ric, I-80055 Naples, Italy

来源：

THIN SOLID FILMS | 1999年 / 354卷 / 1-2期

关键词：

tungsten oxide; evaporation; structural properties; optical properties;

D O I：

10.1016/S0040-6090(99)00567-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Amorphous and crystalline WO3 films show electrochromic properties by means of double injection of cations and electrons. At low substrate temperature thermal evaporation technique produces an amorphous material mixed to a nanocrystalline phase. When this material is annealed at temperatures higher than 400 degrees C a fully crystalline structure is obtained. Different absorption mechanisms are responsible for colored amorphous and crystalline WO3 layers, small polaron transitions and Drude-like free electron scattering, respectively. Furthermore, both O/W ratio and crystalline structure affect electrochromic efficiency of a WO3 film. It has been confirmed that a hydrogen tungsten bronze structure appears when the material is colored. Finally, a self-bleaching process occurs when a colored WO3 film is exposed to an oxidative environment. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：73 / 81

页数：9

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