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Chemical Research in Chinese Universities ›› 2006, Vol. 22 ›› Issue (5): 552-555.doi:

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Structural and Optical Properties of ZnO Films with Different Thicknesses Grown on Sapphire by MOCVD

HOU Chang-min1, HUANG Ke-ke1, GAO Zhong-min1, LI Xiang-shan1, FENG Shou-hua1, ZHANG Yuan-tao2 and DU Guo-tong2
   

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
    2. College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China
  • Received:2005-10-31 Revised:1900-01-01 Online:2006-09-25 Published:2006-09-25
  • Contact: FENG Shou-hua E-mail:shfeng@mail.jlu.edu.cn

Abstract: ZnO(002) films with different thicknesses, grown on Al2O3(006) substrates by metal-organic chemical vapor deposition(MOCVD), were etched by Ar ion beams. The samples were examined by D8 X-ray diffraction, scanning electron microscopy(SEM), and photoluminescence(PL) spectrometry. The structural properties vary with the increasing thickness of the films. When the film thickness is thin, the phi(
Ф) scanning curves for ZnO(103) and sapphire(116) substrate show the existence of two kinds of orientation relationships between ZnO films and sapphire, which are ZnO(002)//Al2O3(006), ZnO(100)//Al2O3(110) and ZnO(002)//Al2O3(006), ZnO(110)//Al2O3(110). When the thickness increases to 500 nm there is only one orientation relationship, which is ZnO(002)//Al2O3(006), ZnO[100]//Al2O3[110]. Their photoluminescence(PL) spectra at room temperature show that the optical properties of ZnO films have been greatly improved when increasing the thickness of films is increased.

Key words: MOCVD, ZnO film, PL spectrum, Thickness