Mahalingam, Savisha and Rabeya, Ramisha and Manap, Abreeza and Lau, Kam Sheng and Chia, Chin Hua and Afandi, Nurfanizan and Omar, Azimah (2025) Electron transport in heteroatom-doped graphene quantum dots for TiO2-based dye-sensitized solar cells. Electrochimica Acta, 510. p. 145369. ISSN 0013-4686, DOI https://doi.org/10.1016/j.electacta.2024.145369.
Full text not available from this repository.Abstract
Graphene quantum dots (GQDs) hold promise as co-sensitizers in dye-sensitized solar cells (DSSCs) due to their excellent light-harvesting capabilities. However, their intrinsic limitations in electron transport can hinder overall device performance. This study investigates the impact of heteroatom-doping with nitrogen (N), fluorine (F), and sulfur (S) on the performance of GQDs as co-sensitizers for N719 dye in DSSCs. The heteroatom-doped GQDs (NFS-GQDs) enhance light harvesting compared to pristine GQDs, extending absorption into the UV region. Photoluminescence quenching data confirms efficient electron injection from both GQDs and NFS-GQDs to the TiO2 conduction band, exhibiting superior electron injection efficiency. Among the co-sensitized cells, 20 wt. % doping level achieves the highest power conversion efficiency of 4.33 %. Besides, electron transport and electronic structure were investigated in detail to understand the interaction of the TiO2/NFS-GQDs+N719 interface. The findings suggest that NFS-doping GQDs offer a promising strategy for developing efficient co- sensitizers for DSSCs.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education, Malaysia, through the Fundamental Research Grant Scheme (FRGS) (FRGS/1/2023/STG05/UNITEN/02/2) |
| Uncontrolled Keywords: | Electron injection; Energy; NFS-GQD; Recombination |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty of Engineering > Department of Electrical Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 24 Feb 2025 01:30 |
| Last Modified: | 24 Feb 2025 01:30 |
| URI: | http://eprints.um.edu.my/id/eprint/47293 |
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