Study on the Effects of Protective Layer on the Electron and Hole Transmission of Cadmium Sulfide (CdS) Photocatalyst Based on a Simple Quantum Mechanical Model
Abstract
Cadmium Sulfide (CdS) is a photocatalyst material with a low energy band gap, which exhibits a potential application for the visible light spectrum. However, the serious photo-corrosion of CdS inhibits its wide applications. To prevent photo-corrosion, one can coat the CdS surface coated with an insulating material. The addition of this insulating layer will produce a barrier potential on the surface of the CdS thereby blocking the transmission of electrons and holes. If the thickness of this protective layer is thin enough the electron and hole can be transmitted by the quantum tunneling effect. Using a simple quantum mechanical model, the phenomena of electron and hole transmission through potential barriers due to the presence of a protective layer on the CdS surface can be analyzed. Based on this model, the effects of variations in thickness and type of protective layer on the performance of CdS photocatalyst materials are studied by calculating the transmission coefficient and injection efficiency values. The protective coatings used in this study were Aluminum Oxide (Al2O3), Hafnium Dioxide (HfO2), and Silicon Dioxide (SiO2). The results show that transmission decreases as the thickness of the protective increases. Among the three types of protective coatings used, HfO2 material has the potential to be used because it has the best injection efficiency value.
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Do, H. H. (2020). Recent progress in TiO2-based photocatalysts for hydrogen evolution reaction: A review. Arabian Journal of Chemistry, 13(2), 3653-3671. doi:https://doi.org/10.1016/J.ARABJC.2019.12.012
Fujishima, A., & Honda, K. (1972). Electrochemical Photolysis of Water at a Semiconductor Electrode. Nature 1972 238:5358, 238(5358), 37–38. doi:https://doi.org/10.1038/238037a0
Hasan, M. N.-H. (2021). Theoretical Prediction of Heterogeneous Integration of Dissimilar Semiconductor with Various Ultra-Thin Oxides and 2D Materials. Electronic Materials, 2(4), 495–503. doi:https://doi.org/10.3390/electronicmat2040034
Liu, M. X. (2016). A Rational Design of Heterojunction Photocatalyst CdS Interfacing with One Cycle of ALD Oxide. Journal of Materials Science and Technology, 32(6), 489–495. doi:https://doi.org/10.1016/j.jmst.2016.04.002
Nasir, J. A. (2020). Recent developments and perspectives in CdS-based photocatalysts for water splitting. Journal of Materials Chemistry A, 8(40), 20752–20780. doi:https://doi.org/10
Nowotny, J. S. (2005). Solar-hydrogen: Environmentally safe fuel for the future. International Journal of Hydrogen Energy, 30(5), 521–544. doi:https://doi.org/10.1016/J.IJHYDENE.2004.06.012
Yao, X. C. (2018). Rational design of Si/TiO2 heterojunction photocatalysts: Transfer matrix method. Applied Catalysis B: Environmental, 221, 70–76.
DOI: https://doi.org/10.26418/pf.v10i3.60652
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Diterbitkan oleh: Berkerjsama dengan:
Jurusan Fisika FMIPA UNTAN Perkumpulan Akademisi dan Saintis Indonesia, Kalimantan Barat
Alamat Redaksi:
Jalan Prof. Dr. H. Hadari Nawawi
Komp. FMIPA UNTAN Pontianak, Kalbar, 78124
Email: prismafisika@physics.untan.ac.id