@conference {friedlmeier1997heterojunctions, title = {Heterojunctions based on Cu2ZnSnS4 and Cu2ZnSnSe4 thin films}, booktitle = {14th European PVSEC}, year = {1997}, author = {Friedlmeier, Th Magorian and Wieser, N and Walter, Th and Dittrich, H and Schock, HW} }