Giraldo S., Neuschitzer M., Lopez-Marino S., Sanchez Y., Xie H., Colina M., Placidi M., Pistor P., Izquierdo-Roca V., Perez-Rodriguez, A., Saucedo E. "Large performance improvement in Cu2ZnSnSe4 based solar cells by surface engineering with a nanometric Ge layer" 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015 pp. - 2015 DOI: 10.1109/PVSC.2015.7356377