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High quality half-cell processing using thermal laser separation

: Eiternick, S.; Kaule, F.; Zühlke, H.U.; Kießling, T.; Grimm, M.; Schoenfelder, S.; Turek, M.

Fulltext (PDF; )

Energy Procedia 77 (2015), pp.340-345
ISSN: 1876-6102
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <5, 2015, Constance>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer CSP ()

Half-cell modules are promising candidates for a new generation of PV-modules as the electrical losses can be reduced while the optical gains are increased. This technological approach requires a cell separation process which does not induce any significant electrical or mechanical damages on cell level. Thermal laser separation (TLS) is a damage free and kerfless dicing technology for brittle materials such as silicon. We investigate the applicability of TLS for the solar cell splitting and compare it to a reference cell-splitting process based on laser scribing and subsequent cleavage. It is found that the electrical properties of the TLS-half-cells are slightly better compared to the reference process and that compared to a laser separation there is no mechanical damage due to the TLS process.