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Proceedings Paper

Development of TFT device stack for integration of organic semiconductors into flexible displays
Author(s): Tomas G. Bäcklund; Rashmi Bhintade; Piotr Wierzchowiec; Li-Wei Tan; Irina Afonina; Stephen Bain; Andromachi Malandraki; Paul Brookes; Giles Lloyd; Steve Tierney; Mark James
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Paper Abstract

To enable the integration of organic transistors into flexible displays we have developed passive materials for a robust, layer-to-layer compatible device stack to be manufactured using a variety of industrially applicable coating and printing processes. The solution processable materials for the OSC protection and the passivation material are designed for good interlayer adhesion and OTFT stability. The 365 nm UV-curable protection layers for the OSC are compatible with fabrication processes commonly used in the display industry, e.g., sputtering of metals. Fabrication of ink-jet printed devices is demonstrated with usage of a passive material suitable for further pixel integration. The bias stress and ambient stability was shown for the integrated stacks of transistors with the carrier mobility greater than that of amorphous silicon. We further demonstrate the development of formulations, suitable for high throughput roll-to-roll processing of soluble small molecule semiconductors allowing a high degree of structural order in the final solid film. Transistor mobility <2 cm2/V·s is achieved with a range of viscosity values compatible with flexographic printing. Fine pattern of OSC is demonstrated with flexographic printing by adjusting the viscosity of the formulation. Uniform layers are achieved with coating and printing techniques and uniformity values are sufficient for display application.

Paper Details

Date Published: 11 October 2012
PDF: 5 pages
Proc. SPIE 8478, Organic Field-Effect Transistors XI, 847808 (11 October 2012); doi: 10.1117/12.929285
Show Author Affiliations
Tomas G. Bäcklund, Merck Chemicals Ltd. (United Kingdom)
Rashmi Bhintade, Merck Chemicals Ltd. (United Kingdom)
Piotr Wierzchowiec, Merck Chemicals Ltd. (United Kingdom)
Li-Wei Tan, Merck Chemicals Ltd. (United Kingdom)
Irina Afonina, Merck Chemicals Ltd. (United Kingdom)
Stephen Bain, Merck Chemicals Ltd. (United Kingdom)
Andromachi Malandraki, Merck Chemicals Ltd. (United Kingdom)
Paul Brookes, Merck Chemicals Ltd. (United Kingdom)
Giles Lloyd, Merck Chemicals Ltd. (United Kingdom)
Steve Tierney, Merck Chemicals Ltd. (United Kingdom)
Mark James, Merck Chemicals Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 8478:
Organic Field-Effect Transistors XI
Zhenan Bao; Iain McCulloch, Editor(s)

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