Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.10: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D2

Recombination kinetics of charge carriers and trap states in P3HT:PCBM blends studied by transient Electron Spin Resonance — •Magdalena Zawadzki¹, Andreas Sperlich¹, Hannes Kraus¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Julius-Maximilians-Universität of Würzburg, D-97074 Würzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, D-97074 Würzburg

The combination of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₆₁-butyric acid methylester (PCBM) has shown promising performance in organic solar cells. In order to understand the fate of photoexited charge carriers in P3HT:PCBM blends, cw- and transient electron spin resonance (ESR) were used to investigate the recombination kinetics of the light induced charges. Using cw-ESR the negative and positive polarons and trap states related to impurities and oxygen contamination can be detected as separate signals, while transient ESR allows access to the life and recombination times of the different species, which are in a time scale from µ s to minutes. We recorded the ESR signal intensity of the polarons and the decay of the photoluminescence after excitation by a pulsed LED. With the transient ESR technique, in addition to the cw-ESR, more detailed information about the P3HT:PCBM blends could be gained.