Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 50: Organic semiconductors: Transistors and OLEDs (with CPP/DS)
HL 50.1: Talk
Tuesday, April 1, 2014, 14:00–14:15, POT 081
Solution-gated organic field effect transistors: small-molecule versus polymeric materials — •Hannah Schamoni1, Rossella Porrazzo1,2, Jose A. Garrido1, and Maria Rosa Antognazza2 — 1Walter Schottky Institut, Technische Universität München, Deutschland — 2Center for Nanoscience Technology (CNST) of IIT@Polimi, via Pascoli 70/3, 20133 Milano, Italy
Solution-gated organic field effect transistors (SGOFETs) are promising devices for biosensing applications featuring, amongst others, low production costs. For the organic semiconductor, two different kinds of materials are typically used, namely polymers like poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (pBTTT) and small molecules like α-sexithiophene (6T). In this work, we have investigated devices of both types regarding their performance, stability, and pH and ion sensitivity. A comparison of the two approaches is presented, taking also into account the differences in processing: While polymers can be spin-coated onto the substrate, small molecules are grown using organic molecular beam deposition. Finally, we will discuss the potential of SGOFETs as light sensors to stimulate nerve cells, which can pave the way towards the development of a new generation of retinal implants.