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Control of the Gold Electrode Work Function for High Performance Organic Thin Film Transistors  

Park, Yeong Don (Department of Energy and Chemical Engineering, University of Incheon)
Publication Information
Applied Chemistry for Engineering / v.23, no.3, 2012 , pp. 289-292 More about this Journal
Abstract
Au electrodes modified with self-assembled monolayers (SAMs) were used to control the work function of source/drain electrodes in triethylsilylethynyl anthradithiophene (TES ADT)-based organic thin film transistors (OTFTs). By using benzothiol (BT) and pentafluorobenzothiol (PFBT) SAMs, the hole injection barrier between Au and the highest occupied molecular orbital (HOMO) of TES ADT was controlled. After a solvent annealing, TES ADT OTFTs with PFBT SAM-treated Au electrodes were found to exhibit high field-effect mobilities of $0.05\;cm^2/Vs$ and on/off current ratios of $10^6$.
Keywords
organic thin film transistors (OTFTs); triethylsilylethynyl anthradithiophene (TES ADT); self-assembled monolayer (SAM); work function; hole injection barrier;
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