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• W4312996862 abstract "Antimony selenide (Sb₂Se₃) has advantages of low-toxicity, abundant and excellent photoelectric properties. It is widely considered as one of the most promising light-harvesting materials for thin-film solar cells. However, the power conversion efficiency of the Sb₂Se₃ thin-film solar cell is still far inferior to that of cadmium telluride, copper indium gallium selenium and perovskite solar cells. As known, the Sb₂Se₃ solar cell performance is closely related to the light absorber layer (crystallinity, composition and bulk defect density, etc.), PN heterojunction quality (charge carrier concertation, energy band alignment and interface defect density, etc.) and back-contact barrier formation, which determines the process of carrier generation, excitation, relaxation, transfer and recombination. The low fill factor is one of the core problems that limit further efficiency improvement of Sb₂Se₃ solar cells, which can be attributed to the high potential barrier at the back contact between the Mo electrode and Sb₂Se₃absorption layer. In this work, a heat treatment is applied to the Mo electrode to generate a MoO₂buffer layer. It can be found that this buffer layer can inhibit MoSe₂ film growth, exhibiting better ohmic contact with Sb₂Se₃ and reducing the back contact barrier of the solar cell. Sb₂Se₃ thin film is prepared by an effective combination reaction involving sputtered and selenized Sb precursor. After introducing the MoO₂buffer layer, it can also promote the formation of (hk1) (including (211), (221) and (002) etc.) preferentially oriented Sb₂Se₃ thin films with average grain size over 1 μm. And the ratio of Sb and Se was optimized from 0.57 to 0.62, approaching the stoichiometric ratio of Sb₂Se₃ thin film and inhibiting the formation of <em>V_se </em>and <em>Sb_Se</em> defects. Finally, it enhances the open-circuit voltage (<em>V_OC</em>) of solar cells from 0.473 V to 0.502 V, short-circuit current density (<em>J_SC</em>) from 22.71 mA/cm² to 24.98 mA/cm², and fill factor (<em>FF</em>) from 46.90% to 56.18%, establishing a promotion in power conversion efficiency (<em>PCE</em>) from 5.04% to 7.05%. This work proposes a facile strategy for interfacial treatment and elucidates the related carrier transport enhancement mechanism, paving a bright avenue to overcome the efficiency bottleneck of Sb₂Se₃ thin film solar cells." @default.
• W4312996862 created "2023-01-05" @default.
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• W4312996862 date "2022-01-01" @default.
• W4312996862 modified "2023-09-28" @default.
• W4312996862 title "Back Contact Optimization for Sb₂Se₃ Solar Cells" @default.
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• W4312996862 doi "https://doi.org/10.7498/aps.71.20221929" @default.
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