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A new approach for the performance evaluation of solar cells under realistic reporting conditions

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3 Author(s)
K. Heidler ; ISE Calibration Lab., Fraunhofer-Inst. fur Solare Energiesyst., Freiburg, Germany ; A. Raicu ; H. R. Wilson

An algorithm was developed which permits the determination of the realistic reporting conditions (RRC) efficiency of solar cells without the need for long-term outdoor measurements of the test objects. For Freiburg (48°N), the year 1986, and a set of three specific sample cells (mono-Si being rather poor), the influence of irradiance, temperature, and solar spectral distribution under RRC on the cell efficiencies was determined. On a yearly basis the RRC efficiency is lower than standard reporting conditions (SRC) efficiency by 7.6%, 8.5% and 9.2% for mono-Si, multi-Si, and GaAs, respectively. The highest monthly deviation is -13.3% in July for GaAs. The strongest reduction comes from irradiance (4.2%-6.3% on a yearly basis) and temperature (3.8%-4.1%), the latter being strongly modulated over the course of a year. The largest spectral effect on a yearly basis was +1.1% and on a monthly basis 3.4% in February for the multi-Si sample

Published in:

Photovoltaic Specialists Conference, 1990., Conference Record of the Twenty First IEEE

Date of Conference:

21-25 May 1990