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Chemical spray pyrolysis synthesis of covellite copper sulphide (CuS) thin films for economical counter electrode for DSSCs

Diwate, Kiran, Rondia, Sachin, Mayabadi, Azam, Rokade, Avinash, Waykar, Ravindra, Borate, Haribhau, Funde, Adinath, Shinde, Manish, Rajedra Prasad, M. B., Pathan, Habib and Jadkar, Sandesh 2018. Chemical spray pyrolysis synthesis of covellite copper sulphide (CuS) thin films for economical counter electrode for DSSCs. Journal of Materials Science: Materials in Electronics 29 (6) , pp. 4940-4947. 10.1007/s10854-017-8453-6

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Thin films of covellite copper sulphide (CuS) were deposited on FTO substrates using chemical spray pyrolysis technique. Influence of Cu-to-S molar ratio on structural, surface morphological, optical and electrical properties were systematically investigated using variety of characterization techniques. Formation of covellite CuS films was confirmed by low angle-XRD and Raman spectroscopy. The field emission scanning electron microscopy analysis revealed the formation of faceted CuS particles without secondary growth. Optical studies exhibited decrease in optical band gap (from 2.21 to 1.69 eV) with increase in Cu-to-S molar ratio. Electrical properties were investigated using Van der Pauw four point probe method and Hall measurements revealed that as-synthesized CuS films have low sheet resistance (1.47–2.45 Ω/□), high carrier mobility (8.90–54.89 cm2/Vs) and high sheet concentration (1016–1018/cm2). The CuS films deposited at optimized Cu-to-S molar ratio (1:2.5) were then further studied for electrochemical impedance spectroscopy and photovoltaic characteristics. A quantum-dot sensitized solar cell incorporating optimized CuS film as counter electrode showed power conversion efficiency of ~ 1.05% with Voc ~ 0.46 V, Isc ~ 1.01 mA/cm2 and fill factor ~ 0.34%. Although the cell is not fully optimized and better results can be anticipated.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Springer Verlag (Germany)
ISSN: 0957-4522
Date of Acceptance: 18 December 2017
Last Modified: 26 Oct 2021 01:06

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