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Efficient solution-processed small-molecule solar cells by insertion of graphene quantum dots

Cited 21 time in Web of Science Cited 21 time in Scopus
Authors
Wang, Dong Hwan; Kim, Jung Kyu; Kim, Sang Jin; Hong, Byung Hee; Park, Jong Hyeok
Issue Date
2014-10
Citation
Nanoscale, Vol.6 No.24, pp.15175-15180
Abstract
In this work, we have demonstrated the results of several positive effects that arise from the addition of graphene quantum dots (GQDs) to solution-processed small molecule bulk-heterojunction (SM-BHJ) solar cells fabricated from a p-DTS(FBTTh2)(2)/[6,6]-phenyl C-71 butyric acid methyl-ester (PC71BM). The device with an optimized ratio of GQDs exhibits increased current density and fill factor owing to 10% improved external quantum efficiency (EQE) and induction of a favorable SM-BHJ morphology. Additionally, the multiple scattering of the GQDs in the SM-BHJ leads to longer optical pathlengths according to the analysis of diffuse reflectance spectra and UV/Vis absorption spectra. The GQD inserted SM-BHJ film at the optimized concentration exhibits decreased charge transport resistance significantly by impedance measurements with effective charge extraction in the device which contributes to 15% enhancement of power conversion efficiency (PCE).
ISSN
2040-3364
URI
https://hdl.handle.net/10371/172231
DOI
https://doi.org/10.1039/c4nr04944f
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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