Illuminated versus dark lock-in thermography investigations of solar cells
by Otwin Breitenstein
International Journal of Nanoparticles (IJNP), Vol. 6, No. 2/3, 2013

Abstract: In this paper, after describing the basics of lock-in thermography investigations of solar cells, the application of this imaging technique for the characterisation of silicon wafer-based solar cells is reviewed. In particular, the differences between various variants of this technique working with and without light illumination are discussed. It is found that, for imaging and a detailed local investigation of leakage currents, both under forward and reverse bias, the application of dark lock-in thermography is most useful. On the other hand, illuminated lock-in thermography provides some unique possibilities, like the investigation of shunts in non-metallised solar cells or without contacting the cells, local efficiency imaging, and the imaging of the local avalanche multiplication factor under reverse bias. A special variant of illuminated lock-in thermography enables the imaging of the minority carrier lifetime distribution and of trapping centres in bare silicon wafers.

Online publication date: Mon, 31-Mar-2014

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