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Energies 2015, 8(5), 4416-4435; doi:10.3390/en8054416

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

1
Electronic Materials and Sensors Group, Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
2
Solar Energy and Materials Science Group, Department of Physics, Federal University of Technology, P. M. B. 1526, Owerri, Nigeria
*
Author to whom correspondence should be addressed.
Academic Editor: Jean-Michel Nunzi
Received: 26 February 2015 / Revised: 6 May 2015 / Accepted: 11 May 2015 / Published: 15 May 2015
(This article belongs to the Special Issue Next Generation of Photovoltaic (PV) Technology)
View Full-Text   |   Download PDF [1368 KB, uploaded 15 May 2015]   |  

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. View Full-Text
Keywords: graded bandgap; electrodeposition; CdTe; ZnS; CdS; solar cell graded bandgap; electrodeposition; CdTe; ZnS; CdS; solar cell
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Echendu, O.K.; Dharmadasa, I.M. Graded-Bandgap Solar Cells Using All-Electrodeposited ZnS, CdS and CdTe Thin-Films. Energies 2015, 8, 4416-4435.

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