Unification of the hole transport in polymeric field-effect transistors and light-emitting diodes.

By C. Tănase, E. Meijer, Paul W. M. Blom, Dago M. De Leeuw. Physical Review Letters, 2003

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Morphology and Charge Transport in Conjugated Polymers (2006, background): “provided an alternative explanation for the difference in mobility in the two directions in amorphous films by pointing out that the charge carrier concentration is several orders of magnitude higher in TFTs than in other devices and that the mobility is charge carrier concentration dependent.([33])”
Charge transport in organic semiconductors. (2012, result): “This is consistent with charge transport studies on an undoped film [123].”
Small Bandgap Polymers for Organic Solar Cells (Polymer Material Development in the Last 5 Years) (2008, background): “For solar cells, the field-effect transistor measurements are less quantitative due to the much higher charge carrier density in these types of devices, which strongly influences the mobility.(49,50) Due to the large variety of measurement techniques the comparison of values reported is often diffic”
Polymer–fullerene bulk heterojunction solar cells (2010, methodology): “Similar to the approach of Bässler, experimental findings of a carrier concentration depending mobility [129]—due to filling of the Gaussian density of states, where lower states act as charge traps—were simulated by a hopping master equation approach and fitted parametrically, yielding an empirical”