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EFFECTS OF Co CONCENTRATION ON THE STRUCTURAL AND OPTICAL PROPERTIES OF Zn1−xCoxS FILMS

Author

Listed:
  • SHUFENG LI

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China†Fundament Department, Chinese People’s Police University, Langfang 065000, P. R. China)

  • LI WANG

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China)

  • XUEQIONG SU

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China)

  • YONG PANG

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China)

  • DONGWEN GAO

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China)

  • XIAOWEI HAN

    (College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China)

Abstract

Amorphous and crystalline Zn1−xCoxS (x=0.1, 0.3, 0.5) thin films were grown on sapphire (Al2O3) substrates by pulsed laser deposition at substrate temperature of 25∘C and 800∘C, respectively. The X-ray diffraction results show that the crystalline film has a cubic zinc blende structure and the crystalline quality decreased with increasing Co-doping concentration. The X-ray diffraction and X-ray photoelectron spectroscopy spectra reveal that the samples reached an overdoping state at Co-doping concentration of x=0.5. The absorbance of films increases and the absorption edge shifts to longer wave length direction with increasing Co-doping concentration. The redshift of the band gap energy depends on the Co composition associating with the Urbach energy. Furthermore, the refractive index and dielectric constant increase with increasing Co-doping concentration. The dispersion parameters, such as dispersion energy (Ed), oscillator energy (Eo), static refractive index (n0), static dielectric constant (ϵ0), interband transition strength moments (M−1 and M−3), oscillator strength So and oscillator wavelength λo, have been analyzed by Wemple–DiDomenico single oscillator model. All these parameters were found to be dependent upon the Co-doping concentration in the Zn1−xCoxS thin films.

Suggested Citation

  • Shufeng Li & Li Wang & Xueqiong Su & Yong Pang & Dongwen Gao & Xiaowei Han, 2020. "EFFECTS OF Co CONCENTRATION ON THE STRUCTURAL AND OPTICAL PROPERTIES OF Zn1−xCoxS FILMS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 27(08), pages 1-10, August.
    • Handle: RePEc:wsi:srlxxx:v:27:y:2020:i:08:n:s0218625x19501968
    DOI: 10.1142/S0218625X19501968
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