Title :
Laser ablation and contact formation for Cu-plated large area C-silicon industrial solar cells
Author :
Hernández, J.L. ; Allebé, C. ; Tous, L. ; John, J. ; Poortmans, J.
Author_Institution :
IMEC vzw, Leuven, Belgium
Abstract :
In this work we demonstrate the successful implementation of laser ablation of SiNx ARC to contact high ohmic emitters up to 120 Ω/sq with an advanced metallization on large area substrates. We propose Suns-Voc measurements as a fast and effective method to characterize the potential laser damage. We look at the laser ablation factors that can compromise the solar cell performance and we see how to limit the damage that can jeopardize the device performance. We define the laser ablation process window for emitters of different resistivity ranging from a typical 60 Ω/sq emitter to a emitter of 140 Ω/sq. A point-contact contacting scheme is proposed that leads to an improved Voc of the solar cell. Finally we present results of the electrical characterization of large area solar cells. Efficiencies up to 18.7% are obtained on large area, 160 μm thick CZ silicon substrates.
Keywords :
copper; elemental semiconductors; laser ablation; metallisation; ohmic contacts; point contacts; silicon; solar cells; Cu-plated large area c-silicon industrial solar cell; Suns-Voc measurement; contact formation; copper plating; laser ablation; metallization; ohmic emitter; point-contact contacting scheme;
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2010 35th IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-5890-5
DOI :
10.1109/PVSC.2010.5615920