Add time:08/17/2019         Source:sciencedirect.com

Antimony sulfide (Sb2S3) with an optical bandgap (Eg) of 1.88 eV and antimony selenide (Sb2Se3) with Eg 1.1 eV, both of orthorhombic crystalline structure, offer a unique opportunity to prepare solar cell absorbers of Eg, 1.3–1.6 eV poised toward economically viable, non-toxic and ‘earth-abundant” devices. We prepared chemical precipitates of Sb-S-Se from solutions containing potassium antimony tartrate, thioacetamide and selenosulfate, which were used as sources in vacuum thermal evaporation to produce thin films (280–300 nm) of composition, Sb2SxSe3−x (x = 0.7–2). The Eg of 1.43–1.6 eV and photoconductivity, 4 × 10−5 and 8 × 10−7 Ω−1 cm−1, respectively of these films help to combine a high open circuit voltage (Voc) of 0.609 V with a conversion efficiency (η) 5.5% or a Voc of 0.503 V with η of 6.2%. A dual-crucible thermal evaporation system allowed the preparation of absorber films of varying composition (x) in the cell structure, SnO2:F (FTO)/CdS/Sb2SxSe3−x/C-Ag. The cell area were, 0.2–0.8 cm2. A prototype module of seven series-connected cells of area 1 cm2 each produced a Voc of 3.5 V, short circuit current 12 mA at η, 2.4%. Evaluation of the composition of the Sb2SxSe3−x films through gracing incidence X-ray diffraction is illustrated; and device parameters and solar cell perspectives of these materials are presented.

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