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Graded-Bandgap Solar Cells Using All-Electrodeposited ZnS, CdS and CdTe Thin-Films

Author

Listed:
  • Obi K. Echendu

    (Electronic Materials and Sensors Group, Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
    Solar Energy and Materials Science Group, Department of Physics, Federal University of Technology, P. M. B. 1526, Owerri, Nigeria)

  • Imyhamy M. Dharmadasa

    (Electronic Materials and Sensors Group, Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK)

Abstract

A 3-layer graded-bandgap solar cell with glass/FTO/ZnS/CdS/CdTe/Au structure has been fabricated using all-electrodeposited ZnS, CdS and CdTe thin layers. The three semiconductor layers were electrodeposited using a two-electrode system for process simplification. The incorporation of a wide bandgap amorphous ZnS as a buffer/window layer to form glass/FTO/ZnS/CdS/CdTe/Au solar cell resulted in the formation of this 3-layer graded-bandgap device structure. This has yielded corresponding improvement in all the solar cell parameters resulting in a conversion efficiency >10% under AM1.5 illumination conditions at room temperature, compared to the 8.0% efficiency of a 2-layer glass/FTO/CdS/CdTe/Au reference solar cell structure. These results demonstrate the advantages of the multi-layer graded-bandgap device architecture over the conventional 2-layer structure. In addition, they demonstrate the effective application of the two-electrode system as a simplification to the conventional three-electrode system in the electrodeposition of semiconductors with the elimination of the reference electrode as a possible impurity source.

Suggested Citation

  • Obi K. Echendu & Imyhamy M. Dharmadasa, 2015. "Graded-Bandgap Solar Cells Using All-Electrodeposited ZnS, CdS and CdTe Thin-Films," Energies, MDPI, vol. 8(5), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:5:p:4416-4435:d:49656
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    References listed on IDEAS

    as
    1. Imyhamy M. Dharmadasa & Ayotunde A. Ojo & Hussein I. Salim & Ruvini Dharmadasa, 2015. "Next Generation Solar Cells Based on Graded Bandgap Device Structures Utilising Rod-Type Nano-Materials," Energies, MDPI, vol. 8(6), pages 1-19, June.
    2. Kim, Jaehoon & Kim, Sangsin, 2015. "2012년 국회법 개정의 효과 연구 [A Study on the Effect of the 2012 National Assembly Act Amendment]," KDI Research Monographs, Korea Development Institute (KDI), volume 127, number v:2015-03(k):y:2015:p:1-1.
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    1. Imyhamy M. Dharmadasa & Ayotunde A. Ojo & Hussein I. Salim & Ruvini Dharmadasa, 2015. "Next Generation Solar Cells Based on Graded Bandgap Device Structures Utilising Rod-Type Nano-Materials," Energies, MDPI, vol. 8(6), pages 1-19, June.

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