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N-Functionalized Graphene Quantum Dots with Ultrahigh Quantum Yield and Large Stokes Shift: Efficient Downconverters for CIGS Solar Cells

Title
N-Functionalized Graphene Quantum Dots with Ultrahigh Quantum Yield and Large Stokes Shift: Efficient Downconverters for CIGS Solar Cells
Authors
Khan, FirozKim, Jae Hyeon
DGIST Authors
Kim, Jae Hyeon
Issue Date
2018-11
Citation
ACS Photonics, 5(11), 4637-4643
Type
Article
Article Type
Article
Keywords
CIGS solar cellsdownconvertersN moietiesN-doped graphene quantum dotsquantum yieldCopper compoundsDoping (additives)Gallium compoundsGrapheneLayered semiconductorsNanocrystalsPhotonsQuantum yieldSemiconductor quantum dotsThin film solar cellsCIGS solar cellsDown-convertersFunctionalized grapheneLight trapping effectsN-dopedPhotoluminescence quantum yieldsRecombination lossThin film solar cell technologySolar cells
ISSN
2330-4022
Abstract
Copper indium gallium selenide (CIGS) is the most promising thin film solar cell technology. However, its high performance is hampered by its poor short-wavelength response. The short-wavelength response can be enhanced via photon downconversion using quantum dots. Unfortunately, most graphene quantum dots (GQDs) are not suitable as downconverters in CIGS cells owing to their low photoluminescence quantum yield (PL QY) and/or low Stokes shift. Herein, an ultrahigh PL QY (99%) and a large Stokes shift (98 nm) are achieved for N-doped GQDs via a novel method. The performance of a CIGS solar cell is enhanced via photon downconversion and the light-trapping effect using the NGQDs. The effectiveness of the NQGDs is manifested in a conversion efficiency (η) of 15.31%. In addition, improvements in the short-circuit current density from 30.69 mA/cm2 to 31.77 mA/cm2 and fill factor from 71.25% to 73.09% are observed. The n and J0 values are decreased by insertion of NGQDs, indicating a reduction in the recombination losses. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9363
DOI
10.1021/acsphotonics.8b01125
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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