@inproceedings{111772e781ee4698b0888bf0ecd55ff7,
title = "TOF mobility measurements in pristine films of P3HT: Control of hole injection and influence of film thickness",
abstract = "Time-of-flight (TOF) photocurrent measurements have been used to study charge transport in films of regioregular poly(3-hexylthiophene) (P3HT). Devices in which the P3HT film had been deposited directly onto an indium tin oxide (ITO) electrode produced high dark currents as a result of hole injection into P3HT from ITO. Photocurrent transients in such devices were disperse. It was found however, that these dark currents could be significantly reduced by inserting a dense TiO2 layer between the ITO and the polymer film. The resulting devices gave non-dispersive transients with hole and electron mobilities in the range of 1 - 2 10-4 cm2 V-1 s-1 at room temperature. The mobility values were observed to be almost independent of film thickness over the range of 350 nm to 4.3 μm. Temperature dependence studies showed a weak dependence on temperature with a low energetic disorder parameter according to analysis using the Gaussian Disorder Model (GDM) of 71 meV.",
keywords = "Charge mobility, Poly(3-hexylthiophene), Time-of-flight",
author = "Ballantyne, {Amy M.} and Wilson, {Joanne S.} and Jenny Nelson and Bradley, {Donal D.C.} and Durrant, {James R.} and Martin Heeney and Warren Duffy and Iain McCulloch",
year = "2006",
doi = "10.1117/12.680655",
language = "English (US)",
isbn = "0819464139",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Organic Photovoltaics VII",
note = "Organic Photovoltaics VII ; Conference date: 15-08-2006 Through 17-08-2006",
}