Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.83: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Polymer field effect transistor with contact modification by organic molecules — •Rebecca Winter1, Maria S. Hammer1, Carsten Deibel1, and Jens Pflaum1,2 — 1Julius-Maximilians-University of Würzburg, Institute of Physics, Experimental Physics VI, D-97074 Würzburg — 2Bavarian Centre for Applied Energy Research e.V. (ZAE Bayern), D-97074 Würzburg
In recent years organic electronics processed from solution received a lot of attention due to their low cost potential. The performance of field effect transistors (FET) influenced the quality of electronic curcuits. In order to get high on/off ratios and low threshold voltages the organic FET has to be optimized. The output current is strongly affected by injection of charge carriers at the contacts. Here we discuss the limitation of the performance of the organic FETs due to this contact/channel interface. Therefore we examine the influence of a monolayer of organic molecules on the Au- contacts before spin-coating rr-poly-3-hexyl-thiophene(rr-P3HT) on the contact resistance and the threshold voltage. From our presented data we will conclude on changes of the respective work functions with and without functionalization. By temperature dependent measurements we are able to discriminate between tunnelling assisted injection processes and those based on thermally activation.