Improved compositional flexibility of Cu(In,Ga)Se2-based thin film solar cells by sodium control technique |
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Authors: | Tokio Nakada Hiroki Ohbo Masakazu Fukuda Akio Kunioka |
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Abstract: | The effects of sodium on off-stoichiometric Cu(In,Ga)Se2 (CIGS)-based thin films and solar cells were investigated. The CIGS-based films were deposited with intentionally incorporated Na2Se on Mo-coated SiOx/soda-lime glass substrates by a multi-step process. By sodium control technique high-efficiency ZnO : Al/CdS/CIGS solar cells with efficiencies of 10–13.5% range were obtained over an extremely wide Cu/(In + Ga) ratio range of 0.51–0.96, which has great merit for the large-area manufacturing process. The improved efficiency in the off-stoichiometric regions is mainly attributed to the increased acceptor concentration and the formation of the Cu(In,Ga)3Se5 phase films with p-type conductvity. A new type of solar cell with p-type Cu(In,Ga)3Se5 phase absorber materials is also suggested. |
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Keywords: | Compositional flexibility Cu(In Ga)Se2 Solar cells Sodium control |
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