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Effect of Shunts on Thin-Film CdTe Module Performance

Published online by Cambridge University Press:  31 January 2011

Galymzhan T. Koishiyev  and
James R. Sites
Galymzhan T. Koishiyev
Affiliation:
[email protected], Colorado State University, Physics, 1875 Campus Delivery, AR124 Engineering, Fort Collins, Colorado, 80523, United States, 9704911105, 9704917947
James R. Sites
Affiliation:
[email protected], Colorado State University, Physics, Fort Collins, Colorado, United States
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Abstract

A 2-D numerical circuit model is used to analyze the impact of shunts on basic performance parameters of a CdTe thin-film module. A numerical estimate of module-efficiency loss in the worst-case scenario due to shunts of different severity and fractional module area is presented. It is shown that absolute module-efficiency loss Δη (%) varies in systematic fashion with these shunt parameters. Estimates of Δη based on simple area-weighted efficiency are typically low by 3-4 times. Furthermore, the distribution pattern of shunts over the module plays a significant role in the module loss. A reliable parameter P to characterize the distribution of shunts is introduced, and its effect on module-efficiency loss, as well as individual-parameter (FF, VOC and JSC) losses, is shown. Furthermore, higher transparent-conductive-oxide (TCO) sheet resistance is shown to increase shunt isolation and consequently mitigate the efficiency decrease.

Keywords

thin filmphotovoltaicsimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1165: Symposium M – Thin-Film Compound Semiconductor Photovoltaics–2009 , 2009 , 1165-M05-22
Copyright
Copyright © Materials Research Society 2009

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References

1. McMahon, T.J., Berniard, T.J., and Albin, D.S., Nonlinear shunt paths in thin-film CdTe solar cells, Journal of Applied Physics 97, 054503 (2005).Google Scholar
2. Fahrenbruch, A.L., Bube, R.H., Fundamentals of Solar Cells, Photovoltaic Solar Energy Conversion, Academic Press, New York, 1983, p. 362–364.Google Scholar
3. Koishiyev, Galymzhan T., Sites, James R., Impact of sheet resistance on 2-D modeling thin-film solar cells, Solar Energy Materials & Solar Cells 93 (2009) 350–354.Google Scholar