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Metal chloride passivation treatments for CdTe solar cells

Published online by Cambridge University Press:  21 August 2013

Jennifer Drayton
Affiliation:
Colorado State University, Physics Department, Fort Collins, CO 80523
Russell Geisthardt
Affiliation:
Colorado State University, Physics Department, Fort Collins, CO 80523
John Raguse
Affiliation:
Colorado State University, Physics Department, Fort Collins, CO 80523
James R. Sites
Affiliation:
Colorado State University, Physics Department, Fort Collins, CO 80523
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Abstract

The traditional CdCl2 passivation of CdTe is expanded by adding other chlorides such as MgCl2, NaCl, and MnCl2 into the process through a two-step passivation procedure that combines closed space sublimation step with a vapor process. This allows the possibility of forming a highly doped field at the back of the device that could act as an electron reflector that could boost device performance by directing electrons back into the absorber layer and increasing the voltage while limiting recombination at the back of the device. The effects the two-step passivation process on device performance are characterized by current-voltage measurements, and by electroluminescence and laser-beam induced current images to show the degree of device uniformity. Additionally, capacitance voltage measurements are used to study doping density, depletion width, and possible formation of a field at the back of the device.

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Copyright
Copyright © Materials Research Society 2013 

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References

McCandless, Brian E. and Sites, James R. in Handbook of Photovoltaic Science and Engineering 2nd Edition edited by Luque, Antonio and Hegedus, Steven (John Wiley & Sons, New York, 2011) pp. 615619.Google Scholar
Green, M.A., Emery, K., Hishikawa, Y., Warta, W., Dunlop, E.D., Progress in Photovoltaics 20 (2012) pp. 606614.CrossRef
Hsaio, Kuo-Sui and Sites, James R., in Proceedings of the 34th IEEE Photovoltaic Specialists Conference (Philadelphia, PA, 2009) pp. 13521356.Google Scholar
John, Raguse, Tyler McGoffin, J., and Sites, James R.Electroluminescence system for analysis of defects in CdTe cells and modules.” Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE. IEEE, 2012.Google Scholar

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