Neuschitzer, M.; Giraldo, S.; Marquez, J.; Dimitrievska, M.; Placidi, M.; Forbes, I.; Izquierdo-Roca, V.; Perez-Rodriguez, A.; Saucedo, E. "Enhancing grain growth and boosting Voc in CZTSe absorber layers – Is Ge doping the answer?" Conference Record of the IEEE Photovoltaic Specialists Conference pp. 183 - 187. 2016 DOI: 10.1109/PVSC.2016.7749574