Optimization of perovskite/carbon interface performance using N-doped coal-based graphene quantum dots and its mechanism analysis

doi:10.1016/j.jechem.2022.12.014

Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 242-252.DOI: 10.1016/j.jechem.2022.12.014

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Optimization of perovskite/carbon interface performance using N-doped coal-based graphene quantum dots and its mechanism analysis

Qixu Hu^a, Xiaoyu Yang^a, Ying Qi^a, Peng Wei^a, Jian Cheng^b, Yahong Xie^a,*

^aState Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources; School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, Xinjiang, China;
^bDepartment of Materials & Chemical Engineering, Hanyang University, Seoul 04763, South Korea

Received:2022-10-27 Revised:2022-11-28 Accepted:2022-12-13 Online:2023-04-15 Published:2023-05-30
Contact: * E-mail address: xyh0707@xju.edu.cn (Y. Xie).

Abstract

Abstract: Optimizing the interfacial properties between perovskite and carbon electrodes has always been an important way to improve the photoelectric conversion efficiency (PCE) of carbon-based perovskite solar cells (C-PSCs) and facilitate their commercialization. In this paper, nitrogen-doped graphene quantum dots (N-GQDs) with fluorescent properties were successfully prepared using inexpensive coal as raw material by a facile and environmentally friendly chemical reagent oxidation. The results show that the electron-rich pyridinic nitrogen in N-GQDs can act as Lewis bases to form coordination bonds with uncoordinated lead ions by sharing electron pairs, thereby reducing the defect density and nonradiative recombination of photo-generated electron-hole, and extending lifetime of charge carriers. In addition, due to the passivation of N-GQDs, the hysteresis effect of the device is significantly reduced and the long-term stability is also improved. By optimizing the concentration, the PCE of C-PSCs achieved a max-imum of 14.31%, which was improved by 20.25% compared with 11.90% of the pristine C-PSCs. This work provides a facile, environmentally friendly and efficient strategy for improving the overall performance of C-PSCs using inexpensive coal-based N-GQDs.

Key words: Carbon-based PSCs, Nitrogen-doped GQDs, Reducing the defect density, Nonradiative recombination

Qixu Hu, Xiaoyu Yang, Ying Qi, Peng Wei, Jian Cheng, Yahong Xie. Optimization of perovskite/carbon interface performance using N-doped coal-based graphene quantum dots and its mechanism analysis[J]. Journal of Energy Chemistry, 2023, 79(4): 242-252.

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Optimization of perovskite/carbon interface performance using N-doped coal-based graphene quantum dots and its mechanism analysis

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