Journal
ORGANIC ELECTRONICS
Volume 26, Issue -, Pages 20-24Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2015.07.009
Keywords
Organic-field-effect transistor (OFET); Low voltage operation; Self-assembled monolayer (SAM); Polymer semiconductor
Funding
- Cambridge Display Technology Ltd
- EPSRC [EP/K03099X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [GR/S96685/01, EP/K03099X/1] Funding Source: researchfish
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Control of the threshold voltage and the subthreshold swing is critical for low voltage transistor operation. In this contribution, organic field-effect transistors (OFETs) operating at 1 V using ultra-thin (similar to 4 nm), self-assembled monolayer (SAM) modified aluminium oxide layers as the gate dielectric are demonstrated. A solution-processed donor-acceptor semiconducting polymer poly(3,6-di(2-thie n-5-yl)-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c] pyrrole-1,4-dione) thieno[3,2-b] thiophene) (PDPP2TTT) is used as the active layer. It is shown that the threshold voltage of the fabricated transistors can be simply tuned by carefully controlling the composition of the applied SAM. The optimised OFETs display threshold voltages around 0 V, low subthreshold slopes (150 +/- 5 mV/dec), operate with negligible hysteresis and show average saturated field-effect mobilities in excess of 0.1 cm(2)/V s at 1 V. (C) 2015 Elsevier B.V. All rights reserved.
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