Organic Light-Emitting Transistors that use concentric source /drain electrodes on a molecular adhesion layer

SANTATO C;CICOIRA F;COSSEDDU, PIERO;BONFIGLIO, ANNALISA;BELLUTTI P;MUCCINI M;ZAMBONI R;MANTOUX A;DOPPELT P.

2006-01-01

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Abstract

Bottom-contact tetracene light-emitting transistors employing a mercaptosilane derivative self-assembled monolayer as adhesive between gold concentric interdigitated source/drain electrodes and SiO2 gate dielectric are described. Devices that employ the mercaptosilane adhesive have a higher mobility and electroluminescence compared to those employing a standard metallic adhesive. This is rationalized in terms of the large, well interconnected grains found in tetracene films deposited on substrates using the mercaptosilane adhesive. Our work represents a step forward in the understanding of physical processes at semiconductor/metal and semiconductor/dielectric interfaces in organic devices. (c) 2006 American Institute of Physics.