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Facile fabrication and optical properties of oriented multilayer Al-doped ZnO films

H. HE1,* , H. YU1

Affiliation

  1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, China

Abstract

Al-doped ZnO films are an excellent transparent conducting material. In this paper, we report the orientation and anisotropic arrangement and optical property of the Al-doped ZnO films prepared by sol-gel method and different calcining schedules on the quartz glass substrate. X-ray diffraction, atomic force microscopy, and spectrophotometer were used to characterize the films. Calcining of 700∼ for 1h after the preannealing at 400∼ for 60min led to a low (002)-preferential orientation and granular grains morphology. Calcining of 700∼ for 1h by heating at rate of 200∼/min led to a high (002)-preferential orientation and morphology of strip grain parallel to each other and to the surface of substrate. The obvious optical anisotropy of the film was observed. The high (002)-oriented films aligning horizontally the strip grains to the substrate show higher transmittance in range of UV-visible light and greater band gap energy. The mechanism of the formation and optical property of oriented films are discussed.

Keywords

ZnO:Al film, Sol-gel method, Orientation, Optical anisotropy, Transmittance, Band gap.

Citation

H. HE, H. YU, Facile fabrication and optical properties of oriented multilayer Al-doped ZnO films, Optoelectronics and Advanced Materials - Rapid Communications, 3, 7, July 2009, pp.680-684 (2009).

Submitted at: June 18, 2009

Accepted at: July 20, 2009