Journal
OPTICAL MATERIALS
Volume 75, Issue -, Pages 166-173Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2017.10.010
Keywords
Carbon quantum dots; Polymer solar cells; Electron acceptor
Categories
Funding
- National Natural Science Foundation of China [U1610255, U1607120]
- Shanxi Provincial Key Innovative Research Team in Science and Technology [2015013002-10, 201605D131045-10]
- Shanxi Provincial Key Research and Development Program [201603D111010, 201703D321015-1]
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology [KLISEAM201502]
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Excitation-wavelength-dependent blue-greenish fluorescent carbon quantum dots (CQDs) with graphite structure were synthesized by chemical vapor deposition (CVD) method. In comparison with those synthesized by hydrothermal method (named H-CQDs), C-CQDs have less hydrophilic terminal groups, showing good solubility in common organic solvents. Furthermore, these synthesized C-CQDs show a low LUMO energy level (LUMO = -3.84 eV), which is close to that of phenyl-C-61-butyric acid methyl ester (PC61BM, LUMO = -4.01 eV), the most widely used electron acceptor in polymer solar cells. Photoluminescence quenching of the poly(3-hexylthiophene-2,5-diyl):C-CQDs blended film (P3HT:C-CQDs) indicated that a photo-induced charge transfer between P3HT and C-CQDs occurs in such a composite film. Bulk heterojunction solar cells using C-CQDs as electron acceptors or doping materials were fabricated and tested. High fill factors were achieved for these C-CQDs based polymer solar cells, demonstrating that CQDs synthesized by CVD could be alternative to the fullerene derivatives for applying in polymer solar cells. (C) 2017 Elsevier B.V. All rights reserved.
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