Effect of Cu content and temperature on the properties of Cu2ZnSnSe4 solar cellsSylvester Sahayaraj, Guy Brammertz, Marie Buffière, Marc Meuris, Jef Vleugels and Jef PoortmansEPJ Photovolt., 7 (2016) 70304DOI: https://doi.org/10.1051/epjpv/2016004