Electron Transport in Heteroatom-Doped Graphene Quantum Dots for TiO2-based Dye-sensitized Solar Cells

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2024-11-17 DOI:10.1016/j.electacta.2024.145369

Savisha Mahalingam, Ramisha Rabeya, Abreeza Manap, Kam Sheng Lau, Chin Hua Chia, Nurfanizan Afandi, Azimah Omar

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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.

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掺杂杂原子的石墨烯量子点中的电子传输，用于基于二氧化钛的染料敏化太阳能电池

石墨烯量子点（GQDs）因其出色的光收集能力而有望成为染料敏化太阳能电池（DSSCs）的共敏化剂。然而，它们在电子传输方面的固有局限性会阻碍设备的整体性能。本研究探讨了氮 (N)、氟 (F) 和硫 (S) 杂原子掺杂对 GQDs 作为 DSSC 中 N719 染料共敏化剂性能的影响。与原始 GQDs 相比，掺杂杂原子的 GQDs（NFS-GQDs）增强了光收集能力，并将吸收范围扩大到紫外区。光致发光淬灭数据证实了电子从 GQDs 和 NFS-GQDs 向二氧化钛导带的高效注入，显示出卓越的电子注入效率。在共敏化电池中，20 wt.% 的掺杂水平实现了 4.33 % 的最高功率转换效率。此外，还详细研究了电子传输和电子结构，以了解 TiO2/NFS-GQDs+N719 界面的相互作用。研究结果表明，掺杂 NFS 的 GQDs 为开发用于 DSSC 的高效共敏化剂提供了一种前景广阔的策略。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.