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Structural and compositional dependence of the CdTexSe1−x alloy layer photoactivity in CdTe-based solar cells

Author

Listed:
  • Jonathan D. Poplawsky

    (Oak Ridge National Laboratory)

  • Wei Guo

    (Oak Ridge National Laboratory)

  • Naba Paudel

    (The University of Toledo)

  • Amy Ng

    (Vanderbilt University, 7330 Stevenson Center, Nashville, Tennessee 37235, USA
    Present address: US Naval Research Laboratory, Materials Science & Technology Division, 4555 Overlook Avenue SW, Washington DC 20375, USA)

  • Karren More

    (Oak Ridge National Laboratory)

  • Donovan Leonard

    (Oak Ridge National Laboratory)

  • Yanfa Yan

    (The University of Toledo)

Abstract

The published external quantum efficiency data of the world-record CdTe solar cell suggests that the device uses bandgap engineering, most likely with a CdTexSe1−x alloy layer to increase the short-circuit current and overall device efficiency. Here atom probe tomography, transmission electron microscopy and electron beam-induced current are used to clarify the dependence of Se content on the photoactive properties of CdTexSe1−x alloy layers in bandgap-graded CdTe solar cells. Four solar cells were prepared with 50, 100, 200 and 400 nm-thick CdSe layers to reveal the formation, growth, composition, structure and photoactivity of the CdTexSe1−x alloy with respect to the degree of Se diffusion. The results show that the CdTexSe1−x layer photoactivity is highly dependent on the crystalline structure of the alloy (zincblende versus wurtzite), which is also dependent on the Se and Te concentrations.

Suggested Citation

  • Jonathan D. Poplawsky & Wei Guo & Naba Paudel & Amy Ng & Karren More & Donovan Leonard & Yanfa Yan, 2016. "Structural and compositional dependence of the CdTexSe1−x alloy layer photoactivity in CdTe-based solar cells," Nature Communications, Nature, vol. 7(1), pages 1-10, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12537
    DOI: 10.1038/ncomms12537
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    Cited by:

    1. Alessandro Romeo & Elisa Artegiani, 2021. "CdTe-Based Thin Film Solar Cells: Past, Present and Future," Energies, MDPI, vol. 14(6), pages 1-24, March.

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