Photoluminescence and Raman study of Cu2ZnSn(SexS1−x)4 monograins for photovoltaic applicationsGrossberg, Maarja; Krustok, Jüri; Raudoja, Jaan; Timmo, Kristi; Altosaar, Mare; Raadik, TaaviThin solid films2011 / p. 7403-7406 : ill