期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901428
关键词
copper-indium-gallium diselenide; Cu concentration; narrow bandgap; photovoltaics; tandem solar cells
类别
资金
- Swiss National Science Foundation(SNF) [NRP70, PV2050]
- SNF-NanoTera
- Swiss Federal Office of Energy
- HZ2020 Sharc25 project
- Swiss State Secretariat for Education, Research and Innovation (SERI) [15.0158]
- Swiss Commission for Technology and Innovation [26231.1 PFNM-NM]
State-of-the-art Cu(In,Ga)Se-2 (CIGS) solar cells are grown with considerably substoichiometric Cu concentrations. The resulting defects, as well as potential improvements through increasing the Cu concentration, have been known in the field for many years. However, so far, cells with high Cu concentrations show decreased photovoltaic parameters. In this work, it is shown that RbF postdeposition treatment of CuInSe2 solar cells allows for capturing the benefits from the improved absorber quality with increasing Cu content. A reduced defect density and an increased doping level for cells with high Cu concentrations close to stoichiometry are demonstrated. Implementing a high mobility front transparent conductive oxide (TCO), the improved absorbers with 1.00 eV bandgap yield a solar cell efficiency of 19.2%, and combined with a perovskite top cell a 4-terminal tandem efficiency of 25.0% are demonstrated, surpassing the record efficiency of both subcell technologies.
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