LED Floodlight for Spectral Tuning of a Class AAA Large Area Pulsed Solar Simulator

Pravettoni, Mauro and Manni, Loris and Dittmann, Sebastian (2015) LED Floodlight for Spectral Tuning of a Class AAA Large Area Pulsed Solar Simulator. In: EU PVSEC Proceedings 31st European Photovoltaic Solar Energy Conference and Exhibition, 14-18 Sep 2015, Hamburg.

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Spectral tuning of solar simulators is a well-known procedure, used in the experimental practice for years with multi-junction cells for concentrating photovoltaics (CPV) and space photovoltaic (PV) applications. Multi-junction structures are also used in second generation thin-film PV modules (for example in a-Si:H compounds). A dedicated international standard procedure (IEC 60904-1.1) is in view of publication, describing the “how-to” for current-voltage characterization of multi-junction PV cells and modules: thereafter spectral tuning will need to become soon a widely diffuse practice in research, research-and-development and development-and-production sites. With this in mind, the authors present here the upgrade of a Class AAA large area pulsed solar simulator to allow spectral tuning by means of a set of high power LEDs. They revise the spectral tuning procedure and show results on commercial modules. They give indications to quantify the new uncertainty contributions arising from the non-uniformity of spectral irradiance and from the spectral mismatch, which affects not only the short-circuit current (which is the same as in single-junction devices), but also the fill factor and the open-circuit voltage in multi-junction devices.

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