Photochromic mechanism in a-WO3 thin films based on Raman spectroscopic studies

초록

The photochromic mechanism in a-WO3 thin films prepared by thermal evaporation has been investigated using Raman scattering measurements. The Raman spectra of uv-irradiated thin films show a weak peak at 450 cm(-1). This peak is known to be related to the gasochromic and electochromic coloration and is attributed to the formation of W5+ = O bonds. The I-V characteristic of uv-irradiated a-WO3 thin films was measured to study the change in the electrical properties due to photochromic coloration. The uv-irradiated films show enhanced conductivity due to excited carriers.

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