SEMICONDUCTOR MATERIALS

ZnS thin films deposition by thermal evaporation for photovoltaic applications

K. Benyahia1, A. Benhaya2 and M. S. Aida3

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 Corresponding author: K. Benyahia, Email: kaddour.benyahia@gmail.com

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Abstract: ZnS thin films were deposited on a glass substrate by thermal evaporation from millimetric crystals of ZnS.The structural, compositional and optical properties of the films are studied by X-ray diffraction, SEM microscopy, and UV-VIS spectroscopy.The obtained results show that the films are pin hole free and have a cubic zinc blend structure with (111) preferential orientation.The estimated optical band gap is 3.5 eV and the refractive index in the visible wavelength ranges from 2.5 to 1.8.The good cubic structure obtained for thin layers enabled us to conclude that the prepared ZnS films may have application as buffer layer in replacement of the harmful CdS in CIGS thin film solar cells or as an antireflection coating in silicon-based solar cells.

Key words: ZnSthin filmsthermal evaporationbuffer layerantireflection coating



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Fig. 1.  XRD diffractograms of ZnS thin films. Insert was from Reference [7].

Fig. 2.  Typical SEM image of the prepared ZnS thin films.

Fig. 3.  EDX spectrum showing the ZnS composition.

Fig. 4.  Typical UV visible transmittance spectrum recorded in ZnS.

Fig. 5.  Variation of ($\alpha h \nu)$$^{2}$ as a function of photons energy,the intercept of the linear part with $x$ axis yields to the optical band gap.

Fig. 6.  Variation of ZnS thin film refractive index as a function of wavelength. Insert was from Reference [7].

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    Received: 22 March 2015 Revised: Online: Published: 01 October 2015

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      K. Benyahia, A. Benhaya, M. S. Aida. ZnS thin films deposition by thermal evaporation for photovoltaic applications[J]. Journal of Semiconductors, 2015, 36(10): 103001. doi: 10.1088/1674-4926/36/10/103001 K. Benyahia, A. Benhaya, M. S. Aida. ZnS thin films deposition by thermal evaporation for photovoltaic applications[J]. J. Semicond., 2015, 36(10): 103001. doi: 10.1088/1674-4926/36/10/103001.Export: BibTex EndNote
      Citation:
      K. Benyahia, A. Benhaya, M. S. Aida. ZnS thin films deposition by thermal evaporation for photovoltaic applications[J]. Journal of Semiconductors, 2015, 36(10): 103001. doi: 10.1088/1674-4926/36/10/103001

      K. Benyahia, A. Benhaya, M. S. Aida. ZnS thin films deposition by thermal evaporation for photovoltaic applications[J]. J. Semicond., 2015, 36(10): 103001. doi: 10.1088/1674-4926/36/10/103001.
      Export: BibTex EndNote

      ZnS thin films deposition by thermal evaporation for photovoltaic applications

      doi: 10.1088/1674-4926/36/10/103001
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      • Corresponding author: Email: kaddour.benyahia@gmail.com
      • Received Date: 2015-03-22
      • Accepted Date: 2015-06-06
      • Published Date: 2015-01-25

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