Ellipsometric studies of optical properties of Er-doped ZnO thin films synthesized by sol-gel method

Lei Miao, Sakae Tanemura, Lili Zhao, Xiudi Xiao, Xiao Ting Zhang

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We have reported a low-cost and fast formation of highly efficient Er centers in ZnO thin films. As a high sensitivity tool for the detection of trace of Er dopant in ZnO film, spectroscopic ellipsometry is employed to disclose the systematic interrelationship of the crystallinity, dielectric function and optical band structure. Pure ZnO thin film shows very sharp band structure. The films with 0.05 at.% Er dopant, annealed at 600 C and 800 C, exhibit the similar tendency where the dopant level appears at the band tail. The band structure of the films with 0.05 at.% Er dopant, annealed at 400 C, is very close to that of pure ZnO. While the samples annealed at 1000 C are on the verge of amorphousness, and the flat curve of photon energy dependent εi(E) is observed. The strain effect caused by the formation of ErO6 pseudo-octahedron structure greatly affects the value of dielectric constants. Therefore, SE analyses reveal significant effect of Er doping and annealing temperatures on the modification of optical band structure, dielectric property and optically active center in ZnO films.

本文言語English
ページ(範囲)125-129
ページ数5
ジャーナルThin Solid Films
543
DOI
出版ステータスPublished - 2013 9 30
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 表面および界面
  • 表面、皮膜および薄膜
  • 金属および合金
  • 材料化学

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