Spectra-Physics is a market leader in lasers for photovoltaic (PV) manufacturing. With thousands of lasers used in PV manufacturing, Spectra-Physics lasers deliver highest reliability and cost-effectiveness for demanding 24/7 operations. Our broad portfolio of lasers for PV is used in a variety of processes for crystalline, multi-crystalline and thin-film a-Si, CdTe and CIGS PV. Our lasers are backed by our team of applications engineers and a global support organization.
Lasers are used for creating openings in the dielectric passivation layer for ohmic contact. Aluminum paste is screen printed to this surface and a subsequent thermal annealing process alloys the aluminum with the laser-exposed silicon to form a good ohmic contact. A typical 6 inch PERC cell will have about 155 laser-scribed lines which are longer than 156 mm, 40-50 µm wide, and are separated by 1 mm. The aggregate length of the PERC scribes on a single wafer is approximately 25 m. The target processing time can be as fast as one second per wafer, which equates to a 25 m/s required scribing speed. Fast two-axis galvo scanners as well as spinning polygon scanners can achieve such speeds. Please see Newport.com for additional information on Solar Panel Manufacturing.