Soluble P3HT-Grafted Graphene for Efficient Bilayer - Heterojunction Photovoltaic Devices
CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF CHEMICAL ENGINEERING
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CH2OH-terminated regioregular poly3-hexylthiophene P3HT was chemically grafted onto carboxylic groups of graphene oxide GO via esterification reaction. The resultant P3HT-grafted GO sheets GP3HT are soluble in common organic solvents, facilitating the structureproperty 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-P3HTC60 heterostructures showed a 200 increase of the power conversion efficiency 0.61 with respect to the P3HTC60 counterpart under AM 1.5 illumination 100 mWcm2.
- Electrooptical and Optoelectronic Devices