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Nhan, Le Minh
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Journal : Bulletin of Chemical Reaction Engineering

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Enhancement of Charge Transfer in Quantum Dot–sensitized Solar Cell Photoanodes by Supporting rGO Layers Phuc, Dang Huu; Tung, Ha Thanh; Duy, Le Doan; Nhan, Le Minh
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20366

Abstract

In this study, we have studied and fabricated quantum dot sensitized solar cells based on photoanodes with the support of rGO buffer layer to enhance the electron transfer ability from TiO2 nano-semiconductor to FTO substrate. The rGO materials were fabricated by hydrothermal method, then they were coated on FTO substrate by Screen - Printing technique to create rGO nano films. The thickness of rGO films was studied from 1 to 3 layers to evaluate the mobility of charge, reduce recombination and resistance of film. Experimental results were determined by structural properties using XRD, FTIR, EDX and XPS, FESEM spectra; determined optical properties using UV-Vis absorption and transmission spectra; determined optical, electrical and chemical properties using Nyquist and EIS spectra. The maximum measured efficiency was 5.23% for the FTO/rGO(2)/TiO2/QDs film, current density 21.34 mA/cm2, open circuit voltage 5.525V and fill factor of 0.34. These results were also proven through the research results of optical properties, electrochemical properties. In addition, these results are also consistent with the studies of others. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Charge Transport Kinetics in Fluorine-Doped Tin Oxide/Titanium Dioxide/Cadmium Sulfide/Cadmium Selenide Doped with Copper(II)/Zinc Sulfide Photoanode Minh, Nguyen Van; Vinh, Nguyen Xuan; Nhan, Le Minh; Thang, Bui Van; Thomas, Deepu
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20455

Abstract

Quantum dot-sensitized solar cells face major limitations due to electron recombination, which reduces their overall efficiency. To address this challenge, we investigated copper-doped cadmium selenide as a novel approach to enhance charge transport in multilayer photoanodes. The objective of this study was to evaluate the effect of copper doping concentration on charge transport kinetics in TiO₂@CdS@CdSe:Cu²⁺@ZnS photoanodes. Photoanodes with varying Cu contents (0–0.5 mol) were fabricated using the successive ionic layer adsorption and reaction method, followed by ZnS passivation. Electrochemical impedance spectroscopy and current–voltage characterization were employed to analyze charge transfer resistance, fill factor, power conversion efficiency, open-circuit voltage, and short-circuit current density. The optimized Cu(0.2) sample achieved the highest efficiency of 4.68% with a short-circuit current density of 27.35 mA/cm², attributed to improved charge transport, reduced recombination, and enhanced light absorption. However, excessive doping increased recombination and induced structural degradation. In conclusion, appropriate copper doping significantly improves the performance of QDSSCs, providing insights for designing advanced quantum absorber structures in next-generation solar cell technologies. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Duy, Le Doan Minh, Nguyen Van Phuc, Dang Huu Thang, Bui Van Thomas, Deepu Tung, Ha Thanh Vinh, Nguyen Xuan