Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.49: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Influence of metal nanoparticles on the optical properties of molecular thin films — •Verena Kolb¹, Nadezda Tarakina², Jochen Manara⁴, Andrès Guerrero Martìnez³, and Jens Pflaum^1,4 — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²Experimental Physics III, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ³Departamento de Química Física, Universidade de Vigo, 36310 Vigo, Spain — ⁴ZAE Bayern, D-97074 Würzburg

Utilization of plasmonic effects at metal nanoparticle surfaces provides an interesting approach to modify the optical properties of molecular thin films and thereby, to enhance their effective absorption. This enhancement is caused by an increase of the near-field component and the scattering of incident light and might be applied in e.g. organic photovoltaic (OPV) cells. In this contribution we present our latest results on synthesis and characterization of metallic nanoparticles. Silver nanocubes were prepared by wet-chemistry from CF₃COOAg-precursor. Complementary structural investigation by TEM, REM and X-ray confirmed the cubic morphology and single crystallinity. By UV-VIS spectrocopy the characteristic spectral features related to the plasmonic resonances of the nanoparticles were identified. Finally, the particles were embedded in an ITO/PEDOT:PSS/DIP layer structure, in analogy to standard OPV architectures, to analyze their influence on optical properties of the active molecular layer by Raman-spectroscopy.