Integration of highly crystalline C8-BTBT thin-films into simple logic gates and circuits

Janneck, R., Nowack, T. S. , De Roose, F., Ali, H., Dehaene, W., Heremans, P., Genoe, J. and Rolin, C. (2019) Integration of highly crystalline C8-BTBT thin-films into simple logic gates and circuits. Organic Electronics, 67, pp. 64-71. (doi: 10.1016/j.orgel.2019.01.010)

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Abstract

Highly crystalline organic thin films possess the charge carrier mobilities needed for high-performance, low-cost flexible electronics. However, only few reports exist that show the integration of these films into short-channel organic circuits. This work describes the integration of highly crystalline layers of the thermally and chemically fragile small molecule C8-BTBT. Thin films of this material are processed by a combination of zone-casting and homoepitaxial vacuum evaporation and display an average charge carrier mobility of 7.5 cm2/V in long channel transistors. The integration of these films into a circuit technology based on a 5 μm channel-length bottom-gate bottom-contact transistor topology results in inverters with gains up to 40 as well as a robust 19-stage ring oscillator. This circuit requires the simultaneous operation of 80 TFTs and displays a stage delay of 40 μs, resulting in an operating frequency of 630 Hz at an operating voltage of 10 V. With the help of circuit modelling, we quantify the relationship between the speed of ring oscillators and the contact resistance of individual transistors. Indeed, the successful integration of highly-crystalline layers with high intrinsic mobility stresses the need for advances in contact engineering.

Item Type:Articles
Additional Information:We acknowledge funding from the European Research Council under the European Seventh Framework Programme (FP7/2007–2013)/ERC grant agreement no 320680 (EPOS CRYSTALLI) and from the Research Foundation Flanders (FWO Vlaanderen) under the FWO-ARRS research collaboration program/grant number G0B5914N (ORSIC-HIMA). F. De Roose thanks the Agency for Innovation by Science and Technology in Flanders (IWT-Vlaanderen) for financial support.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Nowack, Mr Thomas
Authors: Janneck, R., Nowack, T. S., De Roose, F., Ali, H., Dehaene, W., Heremans, P., Genoe, J., and Rolin, C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Organic Electronics
Publisher:Elsevier
ISSN:1566-1199
ISSN (Online):1878-5530
Published Online:11 January 2019
Copyright Holders:Copyright © 2019 Elsevier B.V.
First Published:First published in Organic Electronics 67: 64-71
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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