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Solar Cells Edge Isolation with UV laser



In order to remove parasitic emitter  diffusion around wafer edges of Solar Cells, laser technology is gaining more and more interest. The technique is fast, suitable for inline process, and contactless for safe handling of thin solar cell wafers. We have developed a very efficient process that makes  use of high power, high quality single mode laser emitting at 355 nm, resulting in a process as fast as 1.5 s/cell, with isolation efficiency    as high as 99% (as mesured by LBIC technque). Furthermore, UV laser radiation, due to the high absorption coefficient, results in a nearly damage free groove structures in Silicon, thus maintaining high solar cells conversion efficiency. We have applied Light Beam Induced  Current (LBIC) technique for the in-line detection of wafer edges leakage, which influence the final solar cell quality. Based on the use  of a galvanometric x-y scanner system, three amplitude modulated lasers (633 nm, 780 nm and 830 nm) are focalised on the sample surface  > with a lateral resolution of 60 mm on an area of 12x12 cm2. The  pictures shows the LBIC immage of an optimized UV laser isolation process, the parasitic leakage (right end side of the immage) is nearly absent.

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Via Burona, 51 - 20090 Vimodrone (MI) Italy | Tel. (+39) 02 2740 0236 | Fax. (+39) 02 2502 9161 - E-mail sales@laserpoint.it