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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 42: Poster: Organic-Inorganic Hybrid Systems and Organic Films

O 42.13: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Interactions in Hybrid Nanocomposite Systems studied by Laser-Induced Photoemission Electron Microscopy — •Kevin Oldenburg1, Christian Völkner1, Johannes A. A. W. Elemans2, Karl-Heinz Meiwes-Broer1, Sylvia Speller1, and Ingo Barke11University of Rostock, Institute of Physics, 18059 Rostock, Germany — 2Radboud University Nijmegen, Institute for Molecules & Materials, NL-6525 AJ Nijmegen, The Netherlands

Utilizing the plasmonic properties of metal nanoparticles to locally create excitons in organic semiconductors is a promising pathway to transfer energy from a defined starting point over long distances. By means of spatially and energetically resolved Photoemission Electron Microscopy (PEEM) we study two nanocomposite systems consisting of mass-selected silver nanoparticles (≈15 nm diameter) on top of Cu porphyrin [1] and of tetracene aggregates, respectively. In case of Cu porphyrin we observe an enhancement of the photoemission signal in the direct vicinity of the nanoparticles. Contributions of electrons from particles versus dye can be clearly distinguished, based on spectral information. In tetracene an additional long lived state is populated which shows both enhanced and decreased population nearby different nanoparticles. The results are discussed in view of particle-molecule aggregate coupling (see also [2]). Open questions concern the dynamics and possible exciton migration as well as annihilation.

[1] H. Hartmann et al., J. Phys. Chem. C 120, 16977 (2016)

[2] K. Stallberg et al., J. Phys. Chem. C 121, 13833 (2017)

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