13 September 2007 Distinguishing between nonlinear channel transport and contact effects in organic FETs
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Abstract
We investigate charge injection and transport in organic field-effect transistors fabricated by using poly(2,5-bis(3-tetradecylthiophene-2-yl)thieno[3,2-b]thiophene) (pBTTT-C14) or poly(3-hexylthiophene) (P3HT) as the active polymer layer. We show that in high mobility devices where the channel resistances are low compared to the contact resistances, the device performance can be dominated by the metal/organic semiconductor (OSC) contacts. However, in sets of devices where the channel resistance is dominant over the contacts (usually the lower mobility devices), we see pronounced field dependence in the saturation regime mobilities consistent with a Poole-Frenkel model of charge transport within the channel. The field-dependent mobility in short-channel devices produces nonlinear output current-voltage characteristics which can be modeled consistently in the Poole-Frenkel framework.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
B. H. Hamadani, B. H. Hamadani, J. L. LeBoeuf, J. L. LeBoeuf, R. J. Kline, R. J. Kline, I. McCulloch, I. McCulloch, M. Heeney, M. Heeney, C. A. Richter, C. A. Richter, L. J. Richter, L. J. Richter, D. J. Gundlach, D. J. Gundlach, } "Distinguishing between nonlinear channel transport and contact effects in organic FETs", Proc. SPIE 6658, Organic Field-Effect Transistors VI, 66580V (13 September 2007); doi: 10.1117/12.734433; https://doi.org/10.1117/12.734433
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