Ritzer M., Schönherr S., Schöppe P., Wisniewski W., Giraldo S., Gurieva G., Johannes A., Plass C.T., Ritter K., Martínez-Criado G., Schorr S., Saucedo E., Ronning C., Schnohr C.S. "On the Germanium Incorporation in Cu2ZnSnSe4 Kesterite Solar Cells Boosting Their Efficiency" ACS Applied Energy Materials 3, 1, pp. 558 - 564. 2020 DOI: 10.1021/acsaem.9b01784