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Balancing Light Absorptivity and Carrier Conductivity of Graphene Quantum Dots for High-Efficiency Bulk Heterojunction Solar Cells

Cited 132 time in Web of Science Cited 136 time in Scopus
Authors
Kim, Jung Kyu; Park, Myung Jin; Kim, Sang Jin; Wang, Dong Hwan; Cho, Sung Pyo; Bae, Sukang; Park, Jong Hyeok; Hong, Byung Hee
Issue Date
2013-08
Citation
ACS Nano, Vol.7 No.8, pp.7207-7212
Keywords
graphene quantum dotsbulk heterojunction solar cellslight absorptionconductivity
Abstract
Graphene quantum dots (GQDs) have been considered as a novel material because their electronic and optoelectronic properties can be tuned by controlling the size and the functional groups of GQDs. Here we report the synthesis of reduction-controlled GQDs and their application to bulk heterojunction (BHJ) solar cells with enhanced power conversion, efficiency (PCE). Three different types of GQDs-graphene oxide quantum dots (GOQDs), 5 h reduced GQDs, and 10 h reduced GQDs-were tested in BM solar cells, and the results indicate that GQDs play an important role in increasing optical absorptivity and charge carrier extraction of the BIB solar cells. The enhanced optical absorptivity by rich functional groups in GOQDs increases short-circuit current, while the improved conductivity of reduced GQDs leads to the increase of fill factors. Thus, the reduction level of GQDs needs to be intermediate to balance the absorptivity and conductivity. Indeed, the partially reduced GQDs yielded the outstandingly improved PCE of 7.60% in BM devices compared to a reference device without GQDs (6.70%).
ISSN
1936-0851
URI
https://hdl.handle.net/10371/172129
DOI
https://doi.org/10.1021/nn402606v
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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