Characterization of UV-modulated dielectric constant of ZnO thin films

J. J. Chieh, Y. P. Chen, Shieh-Yueh Yang, Herng-Er Horng, Chin Yih Hong, Hong-Chang Yang

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

The modulation on complex dielectric constant of ZnO thin film with ultraviolet (UV) light is investigated by common-path heterodyne interferometer in visible range. The results indicate that the dielectric constant of ZnO thin film is reduced under UV irradiation. The dielectric constant recovers when the UV irradiation vanishes. As the dielectric constant is related to the charge density of bounded electrons, or so-called valence electrons, the influence of UV irradiation on the resistance of ZnO thin film was studied to clarify the physical mechanism associated with the UV-modulated dielectric constant. It was observed that a smaller resistance was achieved for ZnO thin film under UV irradiation. This implies that the valence electrons absorb the irradiated UV and become conduction electrons.

原文英語
頁(從 - 到)81-84
頁數4
期刊Optoelectronics and Advanced Materials, Rapid Communications
2
發行號2
出版狀態已發佈 - 2008 二月

ASJC Scopus subject areas

  • 電子、光磁材料
  • 電氣與電子工程

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