Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
Organic semiconductors have generated a lot of attention for low cost and thin organic electronic devices. One of the most studied organic semiconductors for for photovoltaic (OPV) applications has been poly(3-hexylthiophene) (P3HT), which possesses high optical absorbance. However P3HT, and other semiconducting polymers, has shown low out-of plane hole mobilities (10-4-10-3 cm2/V.s) compared to in-plane charge transport and mobilities (field effect transport). Higher out-of-plane mobility is important for devices with a diode configuration (OPVs and OLEDs).
Here we report P3HT films with out-of-plane mobilities in excess of 10 cm2/V.s, which is ≈4 orders of magnitude higher than the previously highest mobility in the diode configuration1,2. The films were characterized by synchrotron grazing incidence X-ray diffraction (GIXD), by macroscopic mobility measurements, and by conductive atomic force microscopy (c-AFM).
The exceptional long-range charge transport is well explained by an unusual chain packing and crystallinity, which results in conduction through the chain backbones of P3HT. Data is well fitted with a model of charge transport in an undoped semiconductor. We’ll discuss in detail the relationship between molecular structure and charge transport in these materials.
These results may open the route towards easily processed semiconducting polymers with vertical high mobility for diodes and OPVs.
[1] Coakley et al. Enhanced hole mobility in regioregular polythiophene infiltrated in straight nanopores. Adv. Funct. Mater. 15, 1927–1932 (2005). [2] McGehee, M. D. Nanostructured organic-inorganic hybrid solar cells. MRS Bulletin 34, 95–100 (2009).
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