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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Organic Semiconductors III: Aggregation and Nanostructures (jointly with HL, DS)
CPP 15.5: Vortrag
Dienstag, 15. März 2011, 15:00–15:15, ZEU 222
Plasmonic enhancement of light absorption in organic semiconductors using silver nanowire arrays — •Matthias Handloser1, Ricky Dunbar2, Philipp Altpeter2, Lukas Schmidt-Mende2, and Achim Hartschuh1 — 1Department Chemie and CeNS, Ludwig-Maximilians-Universität, München, Germany — 2Department Physik and CeNS, Ludwig-Maximilians-Universität, München, Germany
Plasmonics can be used to improve light absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of absorber layers, and yielding new options for solar-cell design [1]. We investigated arrays of aligned silver nanowires embedded in different organic polymers via confocal microscopy in combination with Time Correlated Single Photon Counting (TCSPC) and Pump-Probe techniques. The wires had a length of 10 um, a height of 20 nm, and variable widths and spacings. Thin films of different organic semiconductors were then deposited onto these arrays. Plasmon modes were excited through one and two photon absorption between 500 to 900 nm and photoluminescence maps and transients of the arrays were recorded. We observed a clear correlation between photoluminescence intensity, lifetime and nanowire spacing. We analyzed our data to distinguish between absorption and radiative rate enhancement and energy transfer to the metal followed by quenching. [1] H.A.Atwater, A.Polman, Nature Materials 9, 205 (2010)