Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Organic Electronics and Photovoltaics III
CPP 21.1: Vortrag
Mittwoch, 24. März 2010, 09:30–09:45, H37
High-resolution spectroscopic mapping of P3HT:PCBM organic blend films for solar-cell applications — •Xiao Wang1, Dai Zhang1, Kai Braun1, Hans-Joachim Egelhaaf2, Christoph J. Brabec2, and Alfred J. Meixner1 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen — 2Konarka Technologies GmbH, Nürnberg
We present a high resolution near-field spectroscopic mapping of the poly(3-hexylthiophene) and [6, 6]-penyl-C61 butyric acid methyl ester (P3HT:PCBM) blend film upon different thermal annealing.[1] From the simultaneously recorded morphology and spectroscopic information, the interplay among the blend film morphology, the local P3HT:PCBM molecular distribution, and the P3HT photoluminescence (PL) quenching efficiency were discussed. The PL and Raman signals of the electron donor (P3HT) and acceptor (PCBM) have been probed at an optical resolution of approximately 10 nm which allow the direct identification of the chemical nature of the different domains. Moreover, we were able to reveal and quantify local quenching, which is related to the electron transfer from P3HT to PCBM. Based on the experimental results, it is proposed that high resolution near-field spectroscopic imaging proves its clear capability of mapping the local chemical composition and photophysics of the P3HT:PCBM blends on a length of a few nanometers.
[1] X. Wang, et al. Advanced Functional Materials (in press)