Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: P2: Organic Electronics and Photovoltaics
CPP 30.8: Poster
Tuesday, March 17, 2015, 14:00–16:00, Poster B
Charge Transfer Between Single-Wall Carbon Nanotubes, Fullerenes and Polymers — •Michael Auth1, Andreas Sperlich1, Florian Späth3, Tobias Hertel3, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg — 2ZAE Bayern, 97074 Würzburg — 3Physical and Theoretical Chemistry II, Julius Maxim- ilian University of Würzburg
Single-Wall Carbon Nanotubes (SWNT) are of interest to improve the spectral response of organic photovoltaic cells (OPV) due to their near-infrared absorption bands. Additionally, their unique electrical properties, stemming from their one-dimensionality, recommend them to improve charge transport properties of electrons and holes in existing OPV systems. However, it is to date unclear, whether SWNTs act as electron donors or acceptors in conjunction with common OPV materials. Before we can optimize those systems, we need to understand how the SWNTs contribute to charge transfer processes. In this study semiconducting (6,5) SWNTs are combined with widely known OPV materials, such as the fullerene acceptor PC60BM and the polymer P3HT. Using Electron Paramagnetic Resonance (EPR) we can distinguish charge carriers residing on different conjugated organic molecules and SWNTs. We found specific EPR signatures for charges located on either SWNT, P3HT or PC60BM. Our measurements hint at the potential ambipolarity of SWNTs, leading to either hole transfer from PC60BM or electron transfer from P3HT.