Local measurement of solar cell emission characteristics

journal article - other

English

Light emission inspection technique are generally used for the localization of defects. In this paper, the emission comes from reverse biased mono-crystalline solar cells. Firstly, it is demonstrated that light emission of reverse biased solar cells is observable with our system. Experimental data of light emission from cracks, bulk defects, and borders of the cell are presented. Following these measurements, a few scratches were wittingly made on the top side of the solar cell sample and light emission was measured again for the same reverse voltage value. A method for distinguishing micro-crack and scratches from recombination centers is also presented. This method is based on detecting light emission intensity while varying the sample temperature, holding the reverse bias level fixed. The light emission data are then correlated with laser beam induced current maps. It is found that there is a different light emission temperature behavior in the case of bulk recombination defects and artificial damage defects. Finally, the scratched areas are inspected as sites of local structure damage.

solar cell, defect characterization, light emission

ŠKARVADA, P.; TOMÁNEK, P.; GRMELA, L.

2011

1. 11. 2011

SPIE

USA

0277-786X

Proceedings of SPIE

8036

8306

United States of America

1H1

1H6

6