Material Properties of Laser-Welded Thin Silicon Foils

Hessmann MT, Kunz T, Voigt M, Cvecek K, Schmidt M, Bochmann A, Christiansen S, Auer R, Brabec C (2013)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2013

Journal

International Journal of Photoenergy Hindawi Publishing Corporation

Publisher: Hindawi Publishing Corporation

Article Number: 724502

DOI: 10.1155/2013/724502

Abstract

An extended monocrystalline silicon base foil offers a great opportunity to combine low-cost production with high efficiency silicon solar cells on a large scale. By overcoming the area restriction of ingot-based monocrystalline silicon wafer production, costs could be decreased to thin film solar cell range. The extended monocrystalline silicon base foil consists of several individual thin silicon wafers which are welded together. A comparison of three different approaches to weld 50 mu m thin silicon foils is investigated here: (1) laser spot welding with low constant feed speed, (2) laser line welding, and (3) keyhole welding. Cross-sections are prepared and analyzed by electron backscatter diffraction (EBSD) to reveal changes in the crystal structure at the welding side after laser irradiation. The treatment leads to the appearance of new grains and boundaries. The induced internal stress, using the three different laser welding processes, was investigated by micro-Raman analysis. We conclude that the keyhole welding process is the most favorable to produce thin silicon foils.

Authors with CRIS profile

Michael Schmidt Lehrstuhl für Photonische Technologien (LPT) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Additional Organisation(s)

Lehrstuhl für Photonische Technologien (LPT)

Involved external institutions

Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern) DE Germany (DE) Ernst-Abbe-Hochschule Jena / University of Applied Sciences DE Germany (DE) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) Bayerisches Laserzentrum gemeinnützige Forschungsgesellschaft mbH (BLZ) DE Germany (DE)

How to cite

APA:

Hessmann, M.T., Kunz, T., Voigt, M., Cvecek, K., Schmidt, M., Bochmann, A.,... Brabec, C. (2013). Material Properties of Laser-Welded Thin Silicon Foils. International Journal of Photoenergy. https://doi.org/10.1155/2013/724502

MLA:

Hessmann, M. T., et al. "Material Properties of Laser-Welded Thin Silicon Foils." International Journal of Photoenergy (2013).

BibTeX: Download