Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.79: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

Photoinduced polarons in conjugated polymer-fullerene composites studied with light-induced electron-spin resonance — •Andreas Sperlich¹, Moritz Liedtke^1,2, Johannes Sieger¹, Carsten Deibel¹, Ingo Riedel^1,2, Vladimir Dyakonov^1,2, and Nazario Martin³ — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians University of Würzburg, Am Hubland, D-97074 Würzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, Am Hubland, D97074 Würzburg, Germany — ³Departamento de Quimica Organica, Facultad de Quimica, Universidad Complutense, E-28040 Madrid

Electron-spin resonance (ESR) and light induced electron spin resonance (LESR) studies of photogenerated polarons in films of polymer and of polymer-fullerene composites were performed. Investigated materials are regio-regular and regio-random poly(3-hexylthiophene) (RR-P3HT / RRa-P3HT), [6,6] phenyl-C61-butyric acid methyl ester (PCBM) and a novel C70-derivate. In pure polymer-films a single polaron-signal is detected with ESR; it is significantly enhanced under illumination. Polymer-fullerene composites show two distinct polaron signals below 200K. The efficiency of the charge carrier generation in these polymer-fullerene-composites is relevant for applications in organic solar cell devices.