Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 779, Issue -, Pages 387-393Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.155
Keywords
Cu2O solar cell; Ultrathin MgO; Surface modification
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Funding
- National Natural Science Foundation of China [51572239, 91333203]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- National Science and Technology Support Program [2012BAC08B08]
- Major Project of Zhejiang Natural Science Foundation of China [LD18E020002]
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Here, we demonstrated the potential of an ultrathin Mg-rich MgO tunneling layer as a passivation layer for earth-abundant Cu2O based solar cell. An ultrathin Mg-rich MgO layer was introduced to the interface of Cu2O/SnO2 heterojunction by electron beam evaporation, which greatly enhanced the efficiency of Cu2O/SnO2 heterojunction solar cell. The MgO layer was found to significantly reduce the CuO defect density and create a stoichiometry Cu2O surface confirmed by high-resolution X-ray photoelectron spectroscopy. Thus, charge recombination caused by interface defect was mitigated bringing an increased device efficiency. This work highlights the need for stoichiometric Cu2O surface in Cu2O-based solar cells. (C) 2018 Elsevier B.V. All rights reserved.
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