Effect of Spectral Mismatch on Power Rating Measurements - A Comparison of Indoor and Outdoor Measurements for Single and Multi-Junction Devices

The paper investigates the effects of varying spectra on the current production of devices. The use of measured solar simulator spectra as well as simulated clear sky spectra allows us to establish the magnitude of effects that can be expected when e.g. carrying out a round robin intercomparison of different test installations. There are significant variations within each technology group, which will also be affected by the solar simulator class. The findings demonstrate that it is not, however, a clear relationship because it is shown that even within the same solar simulator spectral classification both over- and an underestimation of the current produced by the test device are possible. A methodology based on the average photon energy characterisation of spectra is suggested to carry out spectral correction for outdoor measurements. In the case of solar simulator measurements, this is more difficult and the only way to reduce uncertainty is the use of an appropriate reference cell. The behaviour of multi-junctions is highly dependent on the specific shape of the spectrum and there is as yet no solution of how to correct a solar simulator measurement using a single reference device.

GOTTSCHALG Ralph;  BETTS Thomas R;  HOHL-EBINGER Jochen;  HERRMANN Werner;  MUELLEJANS Harald; 

2008-11-13

WIP-Renewable Energies

JRC40281

http://www.photovoltaic-conference.com/fileadmin/template/res/pics/08_previous_conference/Cdrom_Proceedings/TABLE_OF_CONTENT_FINAL.pdf,    https://publications.jrc.ec.europa.eu/repository/handle/JRC40281,