SEMICONDUCTOR DEVICES

Deposition and doping of CdS/CdTe thin film solar cells

Nima E. Gorji

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 Corresponding author: Nima E. Gorji, E-mail: nima.eshaghigorji2@unibo.it

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Abstract: 1% oxygen is incorporated into both CdS and CdTe layers through RF sputtering of CdS/CdTe thin film solar cells. The optical and electrical parameters of the oxygenated and O2-free devices are compared after CdCl2 treatment and annealing in ambient Ar and/or air. The effects of ambient annealing on the electrical and optical properties of the films are investigated using current-voltage characterization, field emission scanning electron microscopy, X-ray diffraction, and optical transmission spectroscopy. The 1% oxygen content can slightly increase the grain size while the crystallinity does not change. Annealing in ambient Ar can increase the transmission rate of the oxygenated devices.

Key words: CdTe thin filmoxygen incorporationSEMX-ray diffraction



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Fig. 1.  The current-voltage characteristics of O$_2$-free and 1% oxygenated CdS/CdTe thin film devices. The electrical parameters are given in Table 1.

Fig. 2.  The SEM images of oxygenated and O$_2$-free films after activation by CdCl$_2$ and annealing in air or Ar ambient. The effect of activation process on the grain sizes is clear. The images were taken at 100 nm.

Fig. 3.  The XRD patterns of the O$_2$-free and 1% O$_2$ incorporated CdS/CdTe thin films: as-deposited and treated films in air and Ar ambient. All the films show zincblende phase with (1 1 1) plane with less oriented structure for the oxygenated films.

Fig. 4.  Color online) The transmission spectra of O$_2$-free and 1% O$_2$ CdS/CdTe films: as-deposited, annealed in air and Ar ambient. All samples show very good absorption by around 820 nm. As-deposited sample has a red-shift to lower wavelengths. The treatment reduced the band gap of the device. Oxygenation increases the band gap.

Table 1.   The best paramters of the fabricated CdS/CdTe thin film solar cells.

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    Received: 02 November 2014 Revised: Online: Published: 01 May 2015

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      Nima E. Gorji. Deposition and doping of CdS/CdTe thin film solar cells[J]. Journal of Semiconductors, 2015, 36(5): 054001. doi: 10.1088/1674-4926/36/5/054001 N. E. Gorji. Deposition and doping of CdS/CdTe thin film solar cells[J]. J. Semicond., 2015, 36(5): 054001. doi:  10.1088/1674-4926/36/5/054001.Export: BibTex EndNote
      Citation:
      Nima E. Gorji. Deposition and doping of CdS/CdTe thin film solar cells[J]. Journal of Semiconductors, 2015, 36(5): 054001. doi: 10.1088/1674-4926/36/5/054001

      N. E. Gorji. Deposition and doping of CdS/CdTe thin film solar cells[J]. J. Semicond., 2015, 36(5): 054001. doi:  10.1088/1674-4926/36/5/054001.
      Export: BibTex EndNote

      Deposition and doping of CdS/CdTe thin film solar cells

      doi: 10.1088/1674-4926/36/5/054001
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      • Corresponding author: E-mail: nima.eshaghigorji2@unibo.it
      • Received Date: 2014-11-02
      • Published Date: 2015-01-25

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