1Advanced Passivation Technology Lab, College of Physics Science and Technology, Hebei University, Baoding, 071002, China.
2State Key Laboratory of Photovoltaic Materials & Technology, Yingli Green Energy Holding Co., Ltd., Baoding 071051, China.
3Das Solar Co., Ltd., No 43 Bailing South Road, Quzhou Green Industry Clustering Zone, Quzhou, Zhejiang Province, 324022, China.
4Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany.
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