Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Transport: Nanoelectronics III - Molecular Electronics 1
TT 32.9: Talk
Wednesday, March 28, 2012, 17:15–17:30, BH 334
Resonant photoconductance of molecular junctions formed in Gold nano-particle arrays — M. Mangold1, •J. Schopka1, M. Calame2, M. Mayor3, and A.W. Holleitner1 — 1Walter Schottky Insitut and Physik-Department, Technische Universitaet Muenchen, 85748 Garching — 2Departement Physik, Universitaet Basel, 4056 Basel, Switzerland — 3Departement Chemie, Universitaet Basel, 4056 Basel, Switzerland
We report on a molecular phototransistor effect based on oligo(phenylene vinylene) (OPV) incorporated in gold nanoparticle arrays. We find a pronounced photoconductance arising upon resonant excitation of the OPV molecules. We determine the typical response time and the irradiation intensity dependence of this resonant photoconductance. Our results suggest that the charge carriers, which are resonantly excited in the OPV molecules, directly contribute to the current flow through the nanoparticle arrays. We can consistently model the dynamics of the resonant photoconductance by considering the filling and recombination of trap states in the nanoparticle arrays. Our results verify that individual molecules in metal-molecule-metal junctions can be functional modules of optoelectronic devices [1].
M. Mangold, M. Calame, M. Mayor, A.W. Holleitner, J. Am. Chem. Soc. 133, 12185-12191 (2011).