量子点
材料科学
硒化镉
石墨烯
介孔材料
钝化
带隙
纳米技术
纳米颗粒
化学工程
光电子学
化学
图层(电子)
生物化学
工程类
催化作用
作者
In-Rok Jo,Younghoon Lee,Hyunsoo Kim,Kwang‐Soon Ahn
标识
DOI:10.1016/j.jallcom.2021.159527
摘要
Nitrogen-doped graphene quantum dots (N-GQDs) synthesized by a hydrothermal method were incorporated into TiO2 mesoporous films to boost the photovoltaic performance of quantum dot-sensitized solar cells (QDSSCs). Cadmium selenide quantum dots (CdSe QDs) were then deposited on the N-GQDs-incorporated TiO2 films using a successive ionic layer adsorption and reaction (SILAR) technique. The N-GQDs serve multiple functions for enhancing light-harvesting, facilitating electron transportation, and suppressing charge recombination. The non-zero gap N-GQDs both generate excitons as co-sensitizer and provide more adsorption sites for CdSe QDs. Furthermore, the N-GQDs provide efficient electron pathways between TiO2 nanoparticles and passivate the surface defects, giving rise to a high electron diffusion coefficient and long electron lifetime. The resulting QDSSC with the N-GQDs showed significantly improved power conversion efficiency (4.88%) compared to the QDSSC (3.92%) without N-GQDs.
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