Study of structural and optical properties of chemically synthesized nanostructured cadmium zinc sulphide films for band gap tunability

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• 作者：P. K. Mochahari ; K. C. Sarma
• 关键词：CdZnS films ; Williamson–Hall plot ; Size–strain plot ; Optical band gap ; Photoluminescence ; 61.05.cp ; 68.37.Hk ; 68.37.Og ; 78.67.Bf
• 刊名：Indian Journal of Physics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：90
• 期：1
• 页码：21-27
• 全文大小：1,420 KB
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• 作者单位：P. K. Mochahari (1)
  K. C. Sarma (1)
  
  1. Department of Instrumentation and University Science Instrumentation Centre (USIC), Gauhati University, Guwahati, 781014, India
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astronomy, Astrophysics and Cosmology
  Physics
  
• 出版者：Springer India
• ISSN：0974-9845

文摘

Nanostructured cadmium zinc sulphide films have been deposited onto cleaned glass substrates by chemical bath deposition method at room temperature using polyvinyl alcohol as capping agent. X-ray diffraction analysis confirms the formation of cubic-phase cadmium zinc sulphide films. Crystallite size obtained from the calculation of Scherrer’s formula and Williamson–Hall plot as well as size–strain plot is found to decrease with the increase in zinc concentration. The films have very high dislocation density of the order of 1016 m−2, whereas the strain is of the order of 10−3. Scanning electron microscopic image reveals that the particles are agglomerated to form nanoclusters and energy-dispersive X-ray analysis confirms that films are composed of cadmium, zinc and sulphur. High-resolution transmission electron microscopic image reveals that the shape of the particles is nearly spherical, uniformly distributed. Selected-area electron diffraction pattern supports the formation of cubic phase of the film. Optical absorption peaks of the films shift towards lower wavelength side and their optical band gap increases with the increase in zinc concentration. The increase in zinc concentration enhances the photoluminescence emission intensity, whose emission is in the green region of visible spectrum. Keywords CdZnS films Williamson–Hall plot Size–strain plot Optical band gap Photoluminescence