Back Contact Effects on the Electro-Optical Properties of CdTe/CdS Solar Cells

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Studies of junction photoluminescence (PL) in CdTe/CdS solar cells reveal that back-contact application produces a dramatic qualitative change in the junction picosecond-PL spectrum. Prior to contact application, the spectrum has two peaks at energies of 1.501 eV and 1.457 eV, corresponding to recombination in regions of CdTeS alloy with 2% and 12% sulfur content, respectively. After contact application, the spectrum consists of a single broad peak at 1.48 eV. Previous studies have shown that the nitric-phosphoric (NP) etch used in the contact procedure produces a layer of elemental tellurium (Te) on the CdTe surface. We postulate that the change in ... continued below

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Levi, D. H.; Albin, D. S.; Gessert, T. A. (National Renewable Energy Laboratory) & Woods, L. M. (Department of Electrical Engineering, Colorado State University, Ft. Collins, CO) October 15, 1998.

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Studies of junction photoluminescence (PL) in CdTe/CdS solar cells reveal that back-contact application produces a dramatic qualitative change in the junction picosecond-PL spectrum. Prior to contact application, the spectrum has two peaks at energies of 1.501 eV and 1.457 eV, corresponding to recombination in regions of CdTeS alloy with 2% and 12% sulfur content, respectively. After contact application, the spectrum consists of a single broad peak at 1.48 eV. Previous studies have shown that the nitric-phosphoric (NP) etch used in the contact procedure produces a layer of elemental tellurium (Te) on the CdTe surface. We postulate that the change in the near-junction PL spectrum is caused by a grain-boundary field effect due to perturbations of the grain-boundary conductivity and Fermi level.

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  • Presented at the National Center for Photovoltaics Program Review Meeting, Denver, CO (US), 09/08/1998--09/11/1998

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  • Other: DE00006639
  • Report No.: NREL/CP-520-25684
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 6639
  • Archival Resource Key: ark:/67531/metadc706732

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  • October 15, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 30, 2016, 4:58 p.m.

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Levi, D. H.; Albin, D. S.; Gessert, T. A. (National Renewable Energy Laboratory) & Woods, L. M. (Department of Electrical Engineering, Colorado State University, Ft. Collins, CO). Back Contact Effects on the Electro-Optical Properties of CdTe/CdS Solar Cells, article, October 15, 1998; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc706732/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.