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Kerfless Wafering Approach with Si and Ge Templates for Si, Ge and III-V Epitaxy
C. Weiss, W. Schreiber, M. Drießen, R. Sorgenfrei, T. Liu, M. Ohnemus, S. Janz
Epitaxy, Lifetime, Porous Silicon, Porous Germanium
Silicon Materials and Cells
Subtopic: Feedstock, Crystallisation, Wafering, Defect Engineering
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 2DV.2.9
444 - 448
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-2DV.2.9
0,00 EUR
Document(s): paper


We work on the transfer from CZ wafers to epitaxially grown Si and Ge wafers on reusable substrates with a porous detachment layer (“kerfless wafering”) to reduce material and energy consumption. We report on our progress of applying the kerfless wafering approach to Si and to Ge wafers. For Si, we develop templates and epitaxially grown wafers (SiEpiWafers) since many years in our self-made CVD reactor (“RTCVD”) and are now bringing their quality to the next level with a new, microelectronic CVD reactor (“PEpi”) which allows us to grow 6” and 156x156 mm² (M0) epitaxial Si wafers with adjustable thickness and doping level (n- and p-type). In the first test runs, we achieved as-grown lifetimes up to 840 µs and a total thickness variation of ~ 10%. For Ge, we were successful in developing and understanding a porous layer stack leading to 4” detachable Ge templates for future Ge or III-V epitaxial growth.