Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 75: Organic Electronics and Photovoltaics II (Joint session of CPP, DS, HL and O, organized by CPP)
HL 75.9: Vortrag
Donnerstag, 10. März 2016, 12:00–12:15, H40
Ambipolar Charge Transfer In Single-Wall Carbon Nanotube Based Bulk-Heterojunctions — •Michael Auth1, Andreas Sperlich1, Florian Späth2, Tobias Hertel2, and Vladimir Dyakonov1,3 — 1Experimental Physics VI, Julius Maximilian University of Würzburg — 2Institute of Physical and Theoretical Chemistry, Julius Maximilian University of Würzburg, — 3Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), 97074 Würzburg
The exceptional electrical conductivity of Single-Wall Carbon Nano-tubes (SWNT) makes them potentially interesting to improve charge transport in organic photovoltaics (OPV). Additionally, their near infrared absorption bands can improve the spectral response of conventional polymer-fullerene bulk-heterojunctions. Until now, only few OPV devices containing purified semiconducting SWNTs were reported regarding the charge transfer properties of solar cell absorbers. For this study we prepared highly purified semiconducting (6,5)-SWNT samples, which we investigated in combination with known OPV donors and acceptors, namely the fullerene acceptor PC60BM and the conjugated polymer P3HT. Using Electron Paramagnetic Resonance, we found specific signatures for charge carriers localized on either SWNTs, P3HT or PC60BM and revealed the potential ambipolarity of SWNTs, leading to either hole transfer from PC60BM or electron transfer from P3HT. Furthermore our measurements confirmed exceptional SWNT purity, with respect to doping, dangling bonds or catalyst residue. In conclusion, we see a high application potential of (6,5)-SWNTs in OPV and, generally, in optoelectronic devices.