Journal
ACS NANO
Volume 4, Issue 10, Pages 5633-5640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101671t
Keywords
graphene; poly(3-hexylthiophene); end-functionalization; solution processing; solar cells
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Funding
- AFOSR [FA9550-09-1-0331]
- Ministry of Education, Science, and Technology in Korea
- National Research Foundation of Korea [2007-0052351, R31-2008-000-20012-0, 2010-00301, 2009-0073294] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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CH2OH-terminated regioregular poly(3-hexylthiophene) (P3HT) was chemically grafted onto carboxylic groups of graphene oxide (GO) via esterification reaction. The resultant P3HT-grafted GO sheets (G-P3HT) are soluble in common organic solvents, facilitating the structure/property characterization and the device fabrication by solution processing. The covalent linkage and the strong electronic interaction between the P3HT and graphene moieties in G-P3HT were confirmed by spectroscopic analyses and electrochemical measurements. A bilayer photovoltaic device based on the solution-cast G-P3HT/C-60 heterostructures showed a 200% increase of the power conversion efficiency (eta = 0.61%) with respect to the P3HT/C-60 counterpart under AM 1.5 illumination (100 mW/cm(2)).
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