Mobilities conjugated polymers

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Chang, J.F., Clark, J., Zhao, N., Sirringhaus, H., Breiby, D.W., Andreasen, J.W., Nielsen, M.M., Giles, M., Heeney, M. and McCulloch, I., Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymers, Phy. Rev. B, 74, 15318, 2006 (submitted). 

Sirringhaus, H., Tessler, N., Thomas, D.S., Brown, P.J. and Friend, R.H., High-mobility conjugated polymer field-effect transistors. In Advances in Solid State Physics, Vol. 39, ed. B. Kramer Vieweg, Braunschweig, Germany, 1999, 101-110. 

H. Sirringhaus, N. Tessler, D. S. Thomas, P. J. Brown and R. H. Friend. High-mobility conjugated polymer field-effect transistors. Adv. Solid State Phys. 39, 101-110 (1999). 

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However, the values for the current that are obtained with the actual device parameters using the Fowler-Nordheim equation are several orders of magnitude higher than the values for the measured current in real devices. This is due to the fact that the I-V characteristics of PLEDs are determined not only by the injection mechanisms but also by the charge transport mechanism in the active polymer layer (see Section V). The discrepancy between the measured and calculated values for the current in the model for field-induced tunneling can be accounted for by a backflow current of the injected charge carriers into the injection contact. This effect then reduces the net device current and seems to be especially important in low mobility conjugated polymers [93]. 

Lee MJ, Gupta D, Zhao N, Heeney M, McCulloch I, Sirringhaus H (2011) Anisotropy of charge transport in a uniaxially aligned and chain-extended, high-mobility, conjugated polymer semiconductor. Adv Funct Mater 21 932-940... 

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