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Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production

School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea
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Nanomaterials 2020, 10(2), 245; https://doi.org/10.3390/nano10020245
Received: 28 December 2019 / Revised: 23 January 2020 / Accepted: 25 January 2020 / Published: 30 January 2020
(This article belongs to the Special Issue Nanoparticles for Photovoltaics)
A graphene–cadmium sulfide (Gr–CdS) nanocomposite was prepared by a chemical solution method, and its material properties were characterized by several analysis techniques. The synthesized pure CdS nanoparticles (NPs) and Gr–CdS nanocomposites were confirmed to have a stoichiometric atomic ratio (Cd/S = 1:1). The Cd 3d and S 2p peaks of the Gr–CdS nanocomposite appeared at lower binding energies compared to those of the pure CdS NPs according to X-ray photoelectron spectroscopy analyses. The formation of the Gr–CdS nanocomposite was also evidenced by the structural analysis using Raman spectroscopy and X-ray diffraction. Transmission electron microscopy confirmed that CdS NPs were uniformly distributed on the graphene sheets. The absorption spectra of both the Gr–CdS nanocomposite and pure CdS NPs thin films showed an absorption edge at 550 nm related to the energy band gap of CdS (~2.42 eV). The Cu(In,Ga)Se2 thin film photovoltaic device with Gr–CdS nanocomposite buffer layer showed a higher electrical conversion efficiency than that with pure CdS NPs thin film buffer layer. In addition, the water splitting efficiency of the Gr–CdS nanocomposite was almost three times higher than that of pure CdS NPs.
Keywords: Gr–CdS; cadmium sulfide; Cu(In; Ga)Se2; buffer layer; water splitting Gr–CdS; cadmium sulfide; Cu(In; Ga)Se2; buffer layer; water splitting
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Alhammadi, S.; Minnam Reddy, V.R.; Gedi, S.; Park, H.; Sayed, M.S.; Shim, J.-J.; Kim, W.K. Performance of Graphene–CdS Hybrid Nanocomposite Thin Film for Applications in Cu(In,Ga)Se2 Solar Cell and H2 Production. Nanomaterials 2020, 10, 245.

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