UV Irradiation Effect on the Surface KTaO3 Crystals

Mr.Sanit Suwanwong; Artit Hutem; Supoj Kerdmee; P. Moonsri

doi:10.4028/www.scientific.net/AMM.855.121

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 855UV Irradiation Effect on the Surface KTaO3...

UV Irradiation Effect on the Surface KTaO₃ Crystals

Abstract:

The perovskite oxides property are wide band-gap semiconductors and are sensitive to visible light but opaque. In this paper, we are interested in the resistance change of insulating KTaO₃ crystals could decrease as much as 3-4 orders of magnitudes under exposure to focused sunlight. But, these resistances under ambient pressure changed back quickly after light was off. And the resistance changed in a similar way under exposure to synchrotron light but the increase resistance rate was much slower under vacuum condition. However, the large increase resistance rate by increasing the oxygen pressure. From the ARPES study, the change in resistance occurred due to the oxygen vacancy induced by the exposure to ultraviolet light. These oxygen vacancies induce two-dimensional electron gas at the surface KTaO₃. This indicates that the KTaO₃ could be used as a light sensing device.

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Periodical:

Applied Mechanics and Materials (Volume 855)

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121-125

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.855.121

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Online since:

October 2016

Authors:

Mr.Sanit Suwanwong*, Artit Hutem, Supoj Kerdmee, P. Moonsri

Keywords:

KTaO₃, Oxygen Vacancy, UV Irradiation Effect

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