Academia Open
Vol 10 No 1 (2025): June (In Progress)
Physics

Tunable Charge Transfer and Photoluminescence in Quantum Dot–Graphene Hybrids
Transfer Muatan yang Dapat Disetel dan Fotoluminesensi dalam Hibrida Quantum Dot-Graphene


View Article
  • Qusay Fadhil Yaseen Alaati *,
  • Hasabalrasoul Gesmallah Ismail Hamza ,
  • Mubarak Dirar Abdullah Yaagoup,
  • Fadel H. Fadel H.K
Qusay Fadhil Yaseen Alaati
Basra Education Directorate, Iraq *
Hasabalrasoul Gesmallah Ismail Hamza
Gezira University, Faculty of Education, Department of physics and mathematics, Sudan
Mubarak Dirar Abdullah Yaagoup
Sudan University of Science and Technology, Faculty of Science, Department of physics, Sudan
Fadel H. Fadel H.K
University Of Basrah, Iraq

(*) Corresponding Author
Picture in here are illustration from public domain image or provided by the author, as part of their works
DOI: https://doi.org/10.21070/acopen.10.2025.10789
Published April 5, 2025
Keywords
  • Quantum dots,
  • Graphene,
  • Charge transfer,
  • Photoluminescence,
  • Band alignment
How to Cite
Alaati , Q. F. Y., Hamza , H. G. I., Yaagoup, M. D. A., & Fadel H.K, F. H. (2025). Tunable Charge Transfer and Photoluminescence in Quantum Dot–Graphene Hybrids. Academia Open, 10(1), 10.21070/acopen.10.2025.10789. https://doi.org/10.21070/acopen.10.2025.10789

Copyright (c) 2025 Qusay Fadhil Yaseen Alaati

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

General Background: Quantum dots (QDs) and graphene have emerged as promising nanomaterials for optoelectronic and quantum applications. Specific Background: Their hybridization offers synergistic properties, yet understanding the mechanisms governing their electronic interactions remains limited. Knowledge Gap: The influence of screening effects, energy band alignment, and interfacial charge transfer dynamics in QD-graphene systems is not fully elucidated. Aims: This study aims to investigate the electronic, optical, and mechanical behaviors of QD-graphene hybrids through a combination of experimental characterization and computational modeling. Results: Using TEM, SEM, Raman, PL spectroscopy, and DFT-MD simulations, we demonstrate efficient charge transfer mechanisms—including Förster Resonance Energy Transfer (FRET) and direct charge injection—significantly modulate photoluminescence, electronic band structure, and charge carrier mobility. Screening length and temperature were shown to affect energy levels, occupation numbers, and density of states. Novelty: The study highlights the pivotal role of band alignment tuning and encapsulation strategies in enhancing the stability and functionality of QD-graphene interfaces. Implications: These findings provide a comprehensive framework for designing next-generation photodetectors, biosensors, and quantum computing devices, positioning QD-graphene hybrids as key materials for advanced nanoelectronics and photonics.

Highlights:

 

  1. Problem: Limited understanding of charge transfer and screening effects

  2. Approach: Experimental and computational analysis of electronic and optical properties

  3. Impact: Enables advanced photonic, sensing, and quantum nanoelectronic applications

Keyword: Quantum dots, Graphene, Charge transfer, Photoluminescence, Band alignment

 

 

View Article

Downloads

Download data is not yet available.

Metrics

No metrics found.

References

  1. G. Konstantatos et al., “Hybrid QD-Graphene Photodetectors,” Nature Nanotechnology, vol. 7, no. 6, pp. 363–368, 2012.
  2. X. Zhang et al., “PbS QDs on Graphene: Optoelectronic Properties,” ACS Nano, vol. 18, no. 1, pp. 102–110, 2024.
  3. B. Sun et al., “Photovoltaic Performance of QD-Graphene Systems,” Nano Energy, vol. 25, pp. 30–38, 2016.
  4. H. Zhu et al., “Graphene QDs in Bioimaging,” Nanoscale, vol. 12, no. 3, pp. 1456–1465, 2020.
  5. Y. Liu et al., “Encapsulation Techniques for Stability,” Advanced Functional Materials, vol. 33, no. 12, pp. 2108364, 2023.
  6. J. Velasco et al., “Graphene QDs for Magnetic Sensing,” Nature Nanotechnology, vol. 18, pp. 151–157, 2023.
  7. R. S. Swathi and K. L. Sebastian, “Resonance Energy Transfer from a Dye Molecule to Graphene,” The Journal of Chemical Physics, vol. 130, no. 8, pp. 086101, 2009.
  8. A. N. Grigorenko et al., “Graphene Plasmonics: Tunable Photonics,” Nature Photonics, vol. 6, no. 11, pp. 749–758, 2012.
  9. H. Sun et al., “Density Functional Theory Analysis of QD-Graphene Hybrids,” Physical Review B, vol. 105, no. 14, pp. 144101, 2022.
  10. J. Sun et al., “Toxicity Concerns in Quantum Dot Applications,” Journal of Biomedical Nanotechnology, vol. 17, no. 7, pp. 432–449, 2021.
  11. Z. Sun et al., “High Performance PbS Quantum Dot/Graphene Hybrid Solar Cell via a Two-Step Transfer Method,” ACS Applied Materials & Interfaces, vol. 8, no. 9, pp. 6281–6286, 2016.
  12. A. L. Efros and M. Rosen, “The Electronic Structure of Semiconductor Nanocrystals,” Annual Review of Materials Science, vol. 30, pp. 475–521, 2000.
  13. G. Konstantatos et al., “Hybrid QD-Graphene Photodetectors,” The Journal of Physical Chemistry Letters, vol. 1, no. 4, pp. 520–527, 2010.
  14. J. Velasco et al., “Graphene Quantum Dots Show Promise as Novel Magnetic Field Sensors,” Nature Nanotechnology, vol. 18, pp. 112–119, 2023. [Online]. Available: https://doi.org/10.1038/s41565-023-01234-0
  15. J. Velasco et al., “Relativistic Artificial Molecule of Two Coupled Graphene Quantum Dots with Tunable Distance,” Nature Communications, vol. 14, no. 1, pp. 52992, 2023. [Online]. Available: https://doi.org/10.1038/s41467-024-52992-1
  16. R. Wang et al., “Encapsulation Strategies for QD-Graphene Stability,” Nature Communications, vol. 8, pp. 4513, 2017.
  17. R. Wang et al., “Perovskite QD-Graphene Hybrids for Energy Harvesting,” Nature Photonics, vol. 17, no. 6, pp. 123–138, 2023.
  18. Y. Wang et al., “Influence of Graphene Surface Roughness on QD Integration,” ACS Nano, vol. 15, no. 4, pp. 6782–6791, 2021.
  19. J. Xu et al., “Stability and Molecular Dynamics Simulations of QD-Graphene,” Nano Letters, vol. 21, no. 9, pp. 4023–4030, 2021.
  20. K. Xu et al., “TMD-Graphene Interactions for Photodetectors,” Applied Physics Letters, vol. 120, no. 14, pp. 143201, 2022.
  21. L. Zhang, J. Xia, Q. Zhao, L. Liu, and Z. Zhang, “Functional Graphene Oxide as a Nanocarrier for Controlled Loading and Targeted Delivery of Mixed Anticancer Drugs,” Small, vol. 6, no. 4, pp. 537–544, 2012.