Abstract
AbstractDye‐sensitized solar cells (DSSCs) are gaining considerable interest as substitutes to solar cells based on semiconductor thin‐films owing to their cost‐effective and effortless fabrication methods. Efforts are being made to replace counter electrodes (CE) in DSSCs, which are conventionally based on noble metal platinum (Pt). Among the new materials as CE, two‐dimensional (2D) transition metal dichalcogenide is one of the most explored to develop Pt‐free DSSCs. We report here the preparation of TiO2‐based DSSCs using beetroot (Beta vulgaris) extracts as sensitizers with carbon‐, pristine‐, and Ni (4%)‐doped WSe2 as the CEs. The Ni (4%) WSe2 CE exhibited a high‐power conversion efficiency (PCE) of 5.66% under the illumination of 100 mW cm−2. The electrical characteristics, including I‐V, C‐V, and electrochemical impedance spectroscopy, corroborate the better efficiency of Ni (4%) WSe2 CE. The cost‐effectiveness and efficiencies obtained for Pure and Ni (4%) WSe2 make them a worthy candidate as CE for DSSCs.
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