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Local solar cell efficiency analysis performed by injection-dependent PL imaging (ELBA) and voltage-dependent lock-in thermography (Local I-V)

: Breitenstein, O.; Frühauf, F.; Bauer, J.; Schindler, F.; Michl, B.

Volltext (PDF; )

Energy Procedia 92 (2016), S.10-15
ISSN: 1876-6102
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <6, 2016, Chambéry>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

In this contribution two methods for performing local efficiency analysis of solar cells are compared with each other by applying them to a solar cell and a neighboring wafer. The first method called "ELBA" is based on injection-dependent photoluminescence (PL) imaging of a passivated wafer. The second method called "Local I-V" is based on voltage-dependent dark lock-in thermography (DLIT) on a solar cell. The results of both methods with respect to the influence of the bulk on the local solar cell parameters are comparable with each other. However, since only "Local I-V" is investigating a finished solar cell, it may image also local ohmic shunts, inhomogeneous front- and backside and depletion region recombination, and Rs effects, whereas "ELBA" is suited for assessing bulk-related efficiency losses in detail, which are not concealed by the aforementioned cell-related loss mechanisms in this method.