Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Organic electronics and photovoltaics: Transport of charges - from molecules to devices (CPP with HL/TT)
HL 26.7: Vortrag
Dienstag, 17. März 2015, 11:00–11:15, C 130
The role of microstructure on charge transport in semicrystalline polymers — •Riccardo Di Pietro1, Iyad Nasrallah2, Joshua Carpenter3, Lisa Koelln4, Lars Thomsen5, Christopher R. McNeill6, Antonio Facchetti7, Harald W. Ade3, Henning Sirringhaus2, and Dieter Neher4 — 1Hitachi Cambridge Laboratory, UK — 2University of Cambridge, UK — 3North Carolina State University, Raleigh, USA — 4University of Potsdam, Germany — 5Australian Synchrotron, Clayton, Australia — 6Monash University, Clayton, Australia — 7Polyera Corporation, Skokie, USA
We present a study on charge transport on two widely used semiconducting polymers, P(NDI2OD-T2) and P3HT. Combining field effect transistor characterization and charge accumulation spectroscopy we provide a consistent and unambiguous correlation between the charge density dependence of mobility and the semicrystalline morphology of the polymer film. This new experimental evidence demonstrates that charge transport in semicrystalline polymers cannot be described using any currently available charge transport model such as multiple trap and release or variable range hopping. A new charge transport model is therefore proposed, which explicitly accounts for the presence of both crystalline and amorphous regions within the polymer film and for the coulobic repulsion between charge carriers accumulated within the same crystallite. It finally provides a coherent picture of charge transport that has important general consequences in regimes that are relevant not only for transistors but also diodes and solar cells.