期刊
NANOMATERIALS
卷 10, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/nano10030460
关键词
nitrogen-doped carbon quantum dots; co-sensitized solar cell; up-convention; light absorption
类别
资金
- National Natural Science Foundation of China (NSFC) [U1802257, 21701140, 51602282]
- Yunnan Provincial Natural Science Foundation [2017FA024]
- Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province
Dye-sensitized solar cells are regarded as promising candidates to resolve the energy and environmental issues in recent years, arising from their solution-processable fabrication technology and high power conversion efficiency. However, there are still several problems regarding how to accelerate the development of this type of photovoltaics, including the limited light-harvesting ability and high-production cost of molecular dye. In the current work, we have systematically studied the role of nitrogen-doped carbon quantum dots (N-CQDs) as co-sensitizers in traditional dye sensitized solar cells. A series of N-CQDs have been prepared by employing chitosan as a precursor via one-pot hydrothermal technology for various times, demonstrating a maximized efficiency as high as 0.089% for an only N-CQDs-based device. Moreover, the co-sensitized solar cell based on N719 dye (C58H86N8O8RuS2) and optimized N-CQDs shows significantly enhanced performance, yielding a solar-to-electric conversion efficiency of up to 9.15% under one standard sun (AM 1.5G) irradiation, which is much higher than the 8.5%-efficiency of the controlled device without N-CQDs. The matched characteristics of energy level, excellent up-convention, and FRET (Forster resonance energy transfer) abilities of N-CQDs are responsible for their improved power conversion efficiency.
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