Fabrication of Organic Thin Film Transistor Arrays on Plastic and Paper Substrate for Flexible Display Application
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Fabrication of Organic Thin Film Transistor Arrays on Plastic and Paper Substrate for Flexible Display Application Y. Fujisaki, Y. Nakajima, M. Nakata, H. Tsuji, and T. Yamamoto NHK Science and Technology Research Laboratories, Kinuta, Setagaya-ku, Tokyo 157-8510, Japan. ABSTRACT Organic thin-film transistors (OTFTs) are the most promising candidates for flexible electronics owing to their flexible structures, the simplicity of processing large-area devices, and excellent compatibility with flexible substrates. To date, many studies have been reported that have aimed at developing a wide range of plastic electronics such as flexible displays, sensors. In this paper, we discuss our recent work, focusing on OTFT arrays and their application to flexible display. An active-matrix (AM) backplane using a low-temperature cross-linkable olefin-type polymer as the gatedielectric and an air-stable DNTT as the organic semiconductor (OSC) was successfully fabricated on a plastic substrate. The short-channel TFT array exhibited a high hole mobility of over 0.5 cm2/Vs, a low subthreshold slope of 0.31, and excellent environmental and operational stability. A 5-inch flexible OLED display exhibited a high luminescence of over 300 cd/m2 by driving of the DNTT-based OTFTs. Solution-processed OTFTs are also attracting considerable attention owing to both their simple manufacturing process and excellent transistor performance. We present a simple patterning process for a solution-processable OSC that can be used to develop a high-mobility short-channel TFT array. The OSC film was directly patterned on the confined active channel region by a simple lamination coating technique and the resulting TFTs showed a high mobility of up to 1.3 cm2/Vs. In the final section, we report on eco-friendly paper-based organic TFT array. A transparent cellulose nanofibers paper was firstly applied to a flexible substrate for the TFT backplane. A solution-processed TFT on the transparent paper exhibited a high mobility exceeding 1 cm2/Vs, good air stability, and excellent mechanical stability. INTRODUCTION Organic thin-film transistors (OTFTs), which can be fabricated directly on plastic films at low temperatures, have attracted considerable attention for their application to low-cost and large-area electron devices. Since the first demonstration of organic TFT driven “smart pixels” in 1998 [1], the electrical performance of OTFTs has been significantly improved during the past decade, and a number of vacuum-deposited or solution processed OSCs have been reported that surpass the performance of a-Si TFTs [2,3]. In this paper, we present the recent progress in the performance of OTFTs in combination with some gate dielectric materials and OSC materials. We will also discuss a process and integration technologies for achieving a high-performance OTFT backplane for flexible display application.
FABRICATION OF OTFT BACKPLANE WITH AIR-STABLE OSC Figure 1 (a) shows the molecular structure of the organic semiconductor (OSC) and the polymer gate dielectric mate
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