Laser Induced Forward Transfer (LIFT) enables a non-contact, mask-less and high-resolution/high-aspect ratio printing of various metals. However, the small gap between the donor (print head) and the acceptor (silicon wafer), which is typically <25 μm, limits its wider use in manufacturing. We demonstrate LIFT printing of metal micro-droplets from a gap larger than 100 μm to provide high quality electrical contacts to silicon. Post annealing process is not required as the contacts are formed instantaneously during the LIFT process. Printing aluminum contacts on p-type (resistivity of 10-30 Ω cm) and p+ type (0.01 Ω cm) Si substrates yields a specific contact resistance of 0.15 mΩ cm2 and 0.03 mΩ cm2 respectively. Finally, we demonstrate the use of LIFT metallization for serially connecting few vertical solar cells that are locally isolated by porous silicon.
|Original language||American English|
|Number of pages||9|
|State||Published - 1 Apr 2015|
|Event||5th Workshop on Metallization for Crystalline Silicon Solar Cells, 2014 - Constance, Germany|
Duration: 20 Oct 2014 → 21 Oct 2014
Bibliographical noteFunding Information:
This joint research was supported by the SES (solar energy solutions) consortium under the MAGNET program of the chief scientist (the Israeli Ministry of Industry and Trade). We like to thank Towerjazz semiconductor  for providing the vertical solar cells and Inna Lyubina, for the preparation of the test samples and for her professional advices.
© 2015 The Authors.
- high volatge solar cells
- laser priting
- solar cell metallizaion
- vertical solar cell