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Electronics 2016, 5(1), 2; doi:10.3390/electronics5010002

Self-Aligned Metal Electrodes in Fully Roll-to-Roll Processed Organic Transistors

1
VTT Technical Research Centre of Finland Ltd, Printed and Hybrid Functionalities, Tietotie 3, FI-02150 Espoo, Finland
2
VTT Technical Research Centre of Finland Ltd, Customer Solutions, Microkatu 1, FI-70211 Kuopio, Finland
3
VTT Technical Research Centre of Finland Ltd, Printed and Hybrid Functionalities, Kaitoväylä 1, FI-90590 Oulu, Finland
*
Author to whom correspondence should be addressed.
Academic Editor: Hyun Wook Kang
Received: 30 November 2015 / Revised: 23 December 2015 / Accepted: 4 January 2016 / Published: 7 January 2016
(This article belongs to the Special Issue Printed Electronics)
View Full-Text   |   Download PDF [3964 KB, uploaded 7 January 2016]   |  

Abstract

We demonstrate the production of organic bottom gate transistors with self-aligned electrodes, using only continuous roll-to-roll (R2R) techniques. The self-alignment allows accurate <5 µm layer-to-layer registration, which is usually a challenge in high-speed R2R environments as the standard registration methods are limited to the millimeter range—or, at best, to tens of µm if online cameras and automatic web control are utilized. The improved registration enables minimizing the overlap between the source/drain electrodes and the gate electrode, which is essential for minimizing the parasitic capacitance. The complete process is a combination of several techniques, including evaporation, reverse gravure, flexography, lift-off, UV exposure and development methods—all transferred to a continuous R2R pilot line. Altogether, approximately 80 meters of devices consisting of thousands of transistors were manufactured in a roll-to-roll fashion. Finally, a cost analysis is presented in order to ascertain the main costs and to predict whether the process would be feasible for the industrial production of organic transistors. View Full-Text
Keywords: roll-to-roll; organic transistor; self-alignment; printing; cost analysis roll-to-roll; organic transistor; self-alignment; printing; cost analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Vilkman, M.; Ruotsalainen, T.; Solehmainen, K.; Jansson, E.; Hiitola-Keinänen, J. Self-Aligned Metal Electrodes in Fully Roll-to-Roll Processed Organic Transistors. Electronics 2016, 5, 2.

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