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Reliable hot-spot classification in 10 ms using ultra-fast lock-in thermography

: Kasemann, M.; Walter, B.; Warta, W.


Progress in Photovoltaics 17 (2009), Nr.7, S.441-450
ISSN: 1062-7995
Fraunhofer ISE ()

We propose and demonstrate a reliable and non-destructive spatially resolved measurement technique for ultra-fast hot-spot classification of solar cells. The method can deliver quantitative images of the local heat dissipation in hot-spots in measurement times below 10 ms. The high accuracy and sensitivity allow for reliable hot-spot testing and provide the basis for a reliable classification of solar cells into different hot-spot categories. The method can be applied to wafer-based silicon solar cells and in principle also to thin-film solar cells of all material compositions. This paper explains the measurement principle, gives a detailed step-by-step description of viable automated evaluation procedures, and assesses the sensitivity and accuracy of the method.