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Role of Oxide/Metal Bilayer Electrodes in Solution Processed Organic Field Effect Transistors
Abduleziz Ablat1,2, Adrica Kyndiah1, Geoffroy Houin1
1CNRS, Université Bordeaux, Laboratoire de l'Intégration du Matériau au Système (IMS), UMR 5218, ENSCBP, 16 avenue Pey Berland, 33607, Pessac Cedex, France.
Abstract:
High performance, air stable and solution-processed small molecule 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) based organic field-effect transistors (OFETs) with various electrode configurations were studied in detail. The contact resistance of OFET devices with Ag, Au, WO3/Ag, MoO3/Ag, WO3/Au, and MoO3/Au were compared. Reduced contact resistance and consequently improved performance were observed in OFET devices with oxide interlayers compared to the devices with bare metal electrodes. The best oxide/metal combination was determined. The possible mechanisms for enhanced electrical properties were explained by favorable morphological and electronic structure of organic/metal oxide/metal interfaces.
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