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Optimized circuit design for flexible 8-bit RFID transponders with active layer of ink-jet printed small molecule semiconductors

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Author: Kjellander, B.K.C. · Smaal, W.T.T. · Myny, K. · Genoe, J. · Dehaene, W. · Heremans, P. · Gelinck, G.H.
Source:Organic Electronics: physics, materials, applications, 3, 14, 768-774
Identifier: 471482
Keywords: Materials · Flexible circuits · Ink-jet printing · Morphology · Organic RFID · Organic transistors · Unipolar circuits · Building blockes · Circuit designs · Flexible circuit · Organic transistor · Printed transistors · RFID transponders · Saturation mobility · Transistor characteristics · Ink jet printers · Ink jet printing · Integrated circuit manufacture · Morphology · Polystyrenes · Transponders · Transistors · High Tech Systems & Materials · Industrial Innovation · Mechatronics, Mechanics & Materials · HOL - Holst · TS - Technical Sciences


We ink-jet print a blend of 6,13-bis(triisopropyl-silylethynyl)pentacene and polystyrene as the active layer for flexible circuits. The discrete ink-jet printed transistors exhibit a saturation mobility of 0.5 cm2 V -1 s-1. The relative spread in transistor characteristics can be very large. This spread is due to the morphology of the TIPS-PEN crystals, and is difficult to control using inkjet printing. Here we apply a novel circuitry design to minimize the probability of differences between the transistors. We include up to four transistors under the same ink-jet printed deposit. With the new design, we demonstrate unipolar circuitry building blocks such as inverters, NANDs and 19-stage ring-oscillators. Additionally, we integrate almost 300 TFTs, on a surface area of 34 mm2 of plastic foil, for 8-bit RFID transponder circuits. © 2012 Elsevier B.V. All rights reserved.