1. IEK-5 Photovoltaics, Forschungszentrum Jülich, Wilhelm-Johnen-Strasse, 52425 Jülich, Germany
2. Institute of Photovoltaics, Southwest Petroleum University, Xindu Road No. 8, 610500 Chengdu, China
3. Central Institute for Engineering Electronics and Analytics (ZEA-3), Forschungszentrum Jülich, Wilhelm-Johnen-Strasse, 52425 Jülich, Germany