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Photovoltaic Efficiency Measurements

Published online by Cambridge University Press:  29 November 2013

Keith Emery
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Extract

A variety of performance indicators have been employed by the photovoltaic (PV) community to rate the performance of PV cells, modules, and arrays. The PV power conversion efficiency under a set of standard reporting conditions serves as a basis for meaningful comparisons of PV performance, within and among PV technologies. PV efficiency is defined as 100 times the maximum PV electrical power density produced divided by the incident light power at a reference PV temperature, total irradiance, and spectral irradiance. Standard reporting conditions commonly used by the PV community are summarized in Table I.

The direct and global reference spectra were generated by a comprehensive Monte-Carlo computer model and actually integrate to 768 W m−2 and 964 W m−2. The terrestrial PV community has arbitrarily assigned a 1-sun total irradiance of 1,000 W m−2 for the global and direct reference spectra. The term “direct” in Table I refers to the direct-normal (5° field of view about the sun) component of the global spectral irradiance distribution. The term “global” in Table I refers to the spectral irradiance distribution on a 37-tilted south-facing surface with a solar zenith angle of 48.2° (AM1.5). The terms AM1 or AM1.5 are often used to refer to standard spectra, but the relative optical air mass (AM) is a geometrical quantity and can be obtained by taking the secant of the angle between the sun and the zenith.

Type
Research Report
Information
MRS Bulletin , Volume 19 , Issue 6 , June 1994 , pp. 64 - 66
Copyright
Copyright © Materials Research Society 1994

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References

1.ASTM Handbook of Standards, Volume 12.02, ASTM standards E490, E891, E892, E948, and E1036 (American Society for Testing and Materials, 1916 Race St., Philadelphia, PA).Google Scholar
2. “Photovoltaic Devices Part 1: Measurement of Photovoltaic Current-Voltage Characteristics,” International Electrotechnical Commission Standard IEC 904-1 (1989); “Measurement Principles for Terrestrial PV Solar Devices with Reference Spectral Irradiance Data,” International Electrotechnical Commission Standard IEC 904-3 (1989).Google Scholar
3.Emery, K., in Advances in Solar Energy, Volume 7, edited by Böer, K. (American Solar Energy Society, Boulder, CO, 1992) p. 73.Google Scholar
4.Emery, K.A. and Osterwald, C.R., Current Topics in Photovoltaics, Volume 3, edited by Coutts, T. (Academic Press, London, 1988) p. 301.Google Scholar
5.Riordan, C., “Extraterrestrial Solar Spectral Irradiance Data for Modeling the Spectral Irradiance at the Earth's Surface” (NREL Tech. Rep. SERI/TR-215-2921, Golden, CO, 1987).Google Scholar
6.Emery, K.A., Solar Cells 18 (1986) p. 251.CrossRefGoogle Scholar
7.Green, M.A. and Emery, K.A., Prog. Photovoltaics Res. Appl. 1 (1993) p. 25.Google Scholar
8.Metzdorf, J., Wittchen, T., Heidler, K., Dehne, K., Shimokawa, R., Nagamine, F., Ossenbrink, H., Fornarini, L., Goodbody, C., Davies, M., Emery, K., and DeBlasio, R., in Proc. 21st IEEE Photovoltaic Specialists Conf., Orlando, FL, May 21–25, 1990 (IEEE, New York, 1990) p. 952.CrossRefGoogle Scholar
9.Green, M.A. and Emery, K.A., Prog. Photovoltaics Res. Appl. 2 (1994) p. 27.CrossRefGoogle Scholar
10.Fraas, L.M., MRS Bulletin XVIII (10) (1993) p. 48.CrossRefGoogle Scholar
11.Emery, K. and Osterwald, C., Solar Cells 21 (1987) p. 313.CrossRefGoogle Scholar
12.Field, H. and Emery, K., Proc. 23rd IEEE Photovoltaic Specialists Conf., Louisville, KY, May 10–14, 1993 (IEEE, New York, 1993) p. 1180.Google Scholar
13.Luft, W., von Roerdern, B., Stafford, B., and Mrig, L., Proc. 23rd IEEE Photovoltaic Specialists Conf., Louisville, KY, May 10–14, 1993 (IEEE, New York, 1993) p. 860.Google Scholar
14.Emery, K.A. and Osterwald, C.R., Proc. 21st IEEE Photovoltaic Specialists Conf., Orlando, FL, May 21–25, 1990 (IEEE, New York, 1990) p. 1068.CrossRefGoogle Scholar