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• W2607029785 startingPage "1606945" @default.
• W2607029785 abstract "In recent years, Cu2ZnSn(S,Se)4 (CZTSSe) materials have enabled important progress in associated thin-film photovoltaic (PV) technology, while avoiding scarce and/or toxic metals; however, cationic disorder and associated band tailing fundamentally limit device performance. Cu2BaSnS4 (CBTS) has recently been proposed as a prospective alternative large bandgap (~2 eV), environmentally friendly PV material, with ~2% power conversion efficiency (PCE) already demonstrated in corresponding devices. In this study, a two-step process (i.e., precursor sputter deposition followed by successive sulfurization/selenization) yields high-quality nominally pinhole-free films with large (>1 µm) grains of selenium-incorporated (x = 3) Cu2BaSnS4−xSex (CBTSSe) for high-efficiency PV devices. By incorporating Se in the sulfide film, absorber layers with 1.55 eV bandgap, ideal for single-junction PV, have been achieved within the CBTSSe trigonal structural family. The abrupt transition in quantum efficiency data for wavelengths above the absorption edge, coupled with a strong sharp photoluminescence feature, confirms the relative absence of band tailing in CBTSSe compared to CZTSSe. For the first time, by combining bandgap tuning with an air-annealing step, a CBTSSe-based PV device with 5.2% PCE (total area 0.425 cm2) is reported, >2.5× better than the previous champion pure sulfide device. These results suggest substantial promise for the emerging Se-rich Cu2BaSnS4–xSex family for high-efficiency and earth-abundant PV." @default.
• W2607029785 created "2017-04-28" @default.
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• W2607029785 date "2017-04-20" @default.
• W2607029785 modified "2023-10-03" @default.
• W2607029785 title "Earth‐Abundant Chalcogenide Photovoltaic Devices with over 5% Efficiency Based on a Cu ₂ BaSn(S,Se) ₄ Absorber" @default.
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• W2607029785 doi "https://doi.org/10.1002/adma.201606945" @default.
• W2607029785 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28425630" @default.
• W2607029785 hasPublicationYear "2017" @default.
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