Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 40: Joint Session: Organic Semiconductors III: Aggregation and Nanostructures

HL 40.5: Talk

Tuesday, March 15, 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)