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Optically switchable organic field-effect transistors based on photoresponsive gold nanoparticles blended with poly(3-hexylthiophene)
Corinna Raimondo, Núria Crivillers, Federica Reinders, Fabian Sander, Marcel Mayor and Paolo Samorì
Proceedings of the National Academy of Sciences of the United States of America
Vol. 109, No. 31 (July 31, 2012), pp. 12375-12380
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/41685406
Page Count: 6
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Interface tailoring represents a route for integrating complex functions in systems and materials. Although it is ubiquitous in biological systems—e.g., in membranes—synthetic attempts have not yet reached the same level of sophistication. Here, we report on the fabrication of an organic field-effect transistor featuring dualgate response. Alongside the electric control through the gate electrode, we incorporated photoresponsive nanostructures in the polymeric semiconductor via blending, thereby providing optical switching ability to the device. In particular, we mixed poly(3-hexylthiophene) with gold nanoparticles (AuNP) coated with a chemisorbed azobenzene-based self-assembled monolayer, acting as traps for the charges in the device. The light-induced isomerization between the trans and eis states of the azobenzene molecules coating the AuNP induces a variation of the tunneling barrier, which controls the efficiency of the charge trapping/detrapping process within the semiconducting film. Our approach offers unique solutions to digital commuting between optical and electric signals.
Proceedings of the National Academy of Sciences of the United States of America © 2012 National Academy of Sciences