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Title:
 
Laser Induced Forward Transfer of Silver Pastes for Printing of Fingers in c-Si Cells
 
Author(s):
 
Y. Chen, M.I. Sánchez Aniorte, M. Morales, S. Lauzurica, C. Molpeceres
 
Topic:
 
WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Subtopic: Silicon Solar Cell Improvements
Event: 29th European Photovoltaic Solar Energy Conference and Exhibition
Session: 2CV.4.48
 
Pages:
 
1406 - 1409
ISBN: 3-936338-34-5
Paper DOI: 10.4229/EUPVSEC20142014-2CV.4.48
 
Price:
 
 
0,00 EUR
 
Document(s): paper, poster
 

Abstract/Summary:


The main objective of this work is to adapt the Laser Induced Forward Techniques (LIFT), a wellknown laser direct writing technique for material transfer, to define metallic contacts (fingers and busbars) onto c-Si cells. The silver paste (with viscosity around 30-50 kcPs) is applied over a glass substrate using a coater. The thickness of the paste can be control changing the deposit parameters. The glass with the silver paste is set at a controlled gap over the c-Si cell. A solid state pulsed laser (532 nm) is focused at the glass/silver interface producing a droplet of silver that it is transferred to the c-Si cell. A scanner is used to print lines. The process parameters (silver paste thickness, gap and laser parameters -spot size, pulse energy and overlapping of pulses) are modified and the morphology of the lines is studied using confocal microscopy. Long lines are printed and the uniformity (in thickness and height) is studied. Some examples of metallization of larger areas (up to 10 cm x 10 cm) are presented.