Xie, H.; Dimitrievska, M.; Fontane, X.; Sanchez, Y.; Lopez-Marino, S.; Izquierdo-Roca, V.; Bermudez, V.; Perez-Rodriguez, A.; Saucedo, E. "Formation and impact of secondary phases in Cu-poor Zn-rich Cu2ZnSn(S1-ySey)4 (0≤y≤1) based solar cells" Solar Energy Materials and Solar Cells 140, pp. 289 - 298. 2015