Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.21: Poster

Mittwoch, 7. September 2022, 16:00–18:00, P3

Plasmonic-induced Thermoelectric Effects in Metal-organic Hybridstructures — •Lucca Macher¹, Paul Hoppstock¹, Maximilian Frank¹, Maximilian Rödel¹, and Jens Pflaum^1,2 — ¹Experimental Physics VI, University of Würzburg, 97074 Würzburg — ²Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

Local heat generation by plasmonic excitations in noble metal nanoparticles is of high technological interest for numerous applications such as photo-thermal chemistry or cancer therapy. In this work we utilize this approach to create a thermal gradient by the absorption of light in metal-organic hybrid structures. The latter are based on arrays of nanostructured gold and silver triangles in combination with solution processed p-type PEDOT:PSS films. As we can demonstrate, a defined temperature enhancement and thus, gradient evolves upon resonantly exciting local plasmons in the Au or Ag nanoparticle arrays. The amplitude of this enhancement amounts to Δ T = 0.5 K for an incident light power of 1.4 mW/mm². Accordingly, this plasmon-induced temperature gradient which is aligned along the PEDOT:PSS polymer layers results in a significant enhancement of the thermovoltage to V_T = 24 µ V/K as compared to neat PEDOT:PSS (V_T = 12 µ V/K). An application-oriented approach was carried out as well, using arrays of nanostructured gold triangles covered by a transparent polymer-gel electrolyte PEGMA/BEMA in a window-like device architecture. A temperature gradient of Δ T = 0.1 K for an incident light power of 1.8 mW/mm² was determined along the PEGMA/BEMA layer.