Lead-free on-laminate laser soldering

A new module assembling concept

authored by

Maren Gast, Marc Köntges, Rolf Brendel

Abstract

We demonstrate lead-free laser soldering of standard industrial solar cells. The laser-soldered contacts stay stable for more than 240 accelerated ageing cycles by humidity-freeze test and withstand peel forces in excess of 10N/cm. Laser soldering is demonstrated while the cells are lying on the ethylene vinyl acetate (EVA) foil. This permits to connect the solar cells to the lead-free tinned copper ribbons directly on the lamination materials. We also demonstrate soldering on the bottom side by lasering through the glass and the non-polymerized EVA. With the aid of a pick and place robot it thus becomes possible to avoid all string handling. On-laminate laser soldering (OLLS) technique, which permits a high level of automation and process control, induces little thermal and mechanical stress, reduces the handling and should thus be of particular advantage for assembling modules with very thin cells at a high yield.

External Organisation(s)

Institute for Solar Energy Research (ISFH)

Type

Article

Journal

Progress in Photovoltaics: Research and Applications

Volume

16

Pages

151-157

No. of pages

7

ISSN

1062-7995

Publication date

03.2008

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment, Condensed Matter Physics, Electrical and Electronic Engineering

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1002/pip.782 (Access: Open)