1. Institute for Solar Energy Research Hamelin (ISFH), Am Ohrberg 1, 31860, Emmerthal, Germany
2. Global Wafers, Via Nazionale 59, 39012 Merano, Italy
3. Harrison's Lane, Woodstock, OX20 1SS, UK
4. Department of Solar Energy, Institute of Solid-State Physics, Leibniz University Hannover, Appelstr. 2, 30167 Hanover, Germany