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Chemical Bath Deposited WS2 Quantum Dots on TiO2 for Dye Sensitized Solar Cell Applications

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Optical and Quantum Electronics

Source : Volume 52, Issue 2, p.65

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move

Department : Nanosciences and Molecular Medicine

Year : 2020

Abstract : Tungsten disulphide (WS2) quantum dots, coated on titanium dioxide (TiO2) by chemical bath deposition, increased the photovoltaic performance of dye sensitized solar cells (DSSCs) by ~ 11%. WS2 quantum dots exhibited a dominant optical absorption in a spectral range of 350–800 nm with its characteristics peaks at 550 nm and 620 nm corresponding to the direct bandgap optical transition at the K-point. X-ray photoelectron spectroscopic measurement was performed to study W 4f and S 2p peaks assured the presence of phase-pure WS2 quantum dots. Further, transmission electron microscopic studies showed a distribution of 8.5–20 nm quantum dots with d-spacing of 0.33 nm confirming the WS2. Photovoltaic characteristics of DSSCs with WS2 quantum dots asserted the additional photo-electrons generated by WS2 via the increment in photocurrent density and overall performance. This study demonstrated the possibility of integrating 2D-layered quantum dots into DSSCs as an additional photo-absorbing material candidate along with organic photo-sensitizer such as Ruthenium based N719.

Cite this Research Publication : N. S. Powar, Gopakumar, G., Ramanathan, K. V., Shantikumar V Nair, and Dr. Mariyappan Shanmugam, “Chemical Bath Deposited WS2 Quantum Dots on TiO2 for Dye Sensitized Solar Cell Applications ”, Optical and Quantum Electronics, vol. 52, no. 2, p. 65, 2020.

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