Solution-Processed High-Voltage Organic Thin Film Transistor
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Solution-Processed High-Voltage Organic Thin Film Transistor Andy Shih1 and Akintunde Ibitayo Akinwande1 1 Electrical Engineering and Computer Science Department, Microsystems Technology Laboratories, Massachusetts Institute of Technology, Cambridge, MA 02141, U.S.A ABSTRACT A 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) based high-voltage organic thin film transistor (HVOTFT) has been demonstrated via a low temperature (< 100⁰C) solution-processed fabrication method on borosilicate glass. High-voltage is an area not well developed in the organic transistor field and can be of benefit to various applications requiring such an operating range beyond that of conventional thin film transistors. Here, our HVOTFT exhibited a mobility μ of 0.005 cm2 V-1 s-1 and a breakdown voltage of VDS > 120 V, the latter being due a space-charge limiting device architecture in which the channel is partially gated. Non-saturating I-V characteristic behavior was observed. This is in contrast with our vacuumdeposited pentacene HVOTFTs which exhibited breakdown voltages of VDS > 400 V. TIPSpentacene was grown via a drop-casting deposition, with its crystallinity and grain size deduced under XRD and SEM analysis. The HVOTFT was fabricated with a dielectric stack of a high-k Bi1.5Zn1Nb1.5O7 (BZN) and parylene-C. INTRODUCTION Organic electronic devices have been of great interest over the past few decades due to their mechanical flexibility, room temperature processing, large area depositions, biodegradability, and potential low processing costs [1-4]. These allow for a truly ubiquitous electronics world where electronics are no longer confined to planar surfaces, but are free to be placed onto any arbitrary surface or material. With the development of organic light emitting diodes (OLEDs), organic photovoltaics (OPVs), and organic field effect transistors (OFETs), organic semiconductors have found their place in the electronic market, fueling innovative applications such as flexible displays [5], electronic skin and fabric [6], cheap and disposable RFID tags [7], anti-counterfeiting banknotes [8], as well as bio-sensors [9]. In terms of transistor behavior, although typical organic semiconductor mobilities are between 0.01 and 10 cm2V-1s-1, their performance matches or even surpasses that of typical a-Si thin film transistors (TFTs) [10]. Enabling a truly ubiquitous electronics world not only requires cheap, flexible and performing transistors, but also a versatile operating range to meet the demands of the application. High-voltage (> 100 V) is an area not well explored in the realm of organics and could enable flexible capacitive MEMS actuation integrated on shapeshifting plastic shells or fabrics. High-voltage drivers can be utilized in novel display systems such as ferroelectric liquid crystals, electrophoretic or electro-optic displays, or even tactile MEMS-based braille sheets [1114]. Digital x-ray imaging is yet another application in which a high-voltage organic thin film transistor can be of use by replacing the flat
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