Organic Thin Film Transiators on Synthesis Paper
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0965-S06-16
Organic Thin Film Transiators on Synthesis Paper Hua-Chi Cheng, Yu-Rung Peng, Chao-An Chung, Wei-Hsin Hou, and Zing-Way Pei EOL, Industrial Technology Research Institute, Hsinchu county, 310, Taiwan
ABSTRACT We have demonstrated organic thin-film transistor devices on synthesis paper of polypropylene (PP). All the fabrications are in solution-based processes except electrodes. As a barrier and smoother layer, photosensitive epoxy, 5µm-thich was coated on the paper substrate by using slit die coating. Polyvinyl phenol (PVP) was mixed with poly (melamine-coformaldehyde) methylated, filmed by spin coating and ultraviolet (UV) cross linked to provide the gate dielectric layer. Using poly (3-hexylthiophene) as an active layer, a high-performance organic transistor with field effect mobility up to 0.006 cm2/ V s and an on/off ratio of 50 can be achieved. For the applications in flexible and disposable electronics, to build organic transistors on a cheap synthesis paper substrate can extremely lower the cost. INTRODUCTION Organic thin-film transistors (TFTs) allow the fabrication of electronic circuits and active-matrix displays on a rigid or flexible substrates, such as silicon [1], glass [2], and polyimide [3]. For the organic thin-film transistors (OTFTs) applications, based circuits are particularly suited for large-area devices (e.g., active matrix displays) where high switching speeds are not essential; they may also be widely investigated as switching devices for electronics, such as radio-frequency identification tags (RF-IDs), and sensors. To reduce production costs and enhance tag efficiency, the effects the paper substrates impose on electronic properties of the printed area must be examined. The use of renewable materials to develop or improve existing materials or technologies is one of the most important ideas of research. Recently, paper-like organic electronics have gathered more attention and significant progresses have been made on the fields of organic transistors [4] and organic light-emitting diodes [5]. OTFTs with vacuum-deposited organic semiconductors exhibit the highest performance, but from a manufacturing cost point of view, printing based technology is more favorable. Using cheap synthesis paper instead of high-cost polymer substrates, with roll-to-roll processing, extremely low-cost electronics can be realized. However, compared to other flexible substrates the paper substrate suffers from wet process and heat treatments. Moreover, the porosity, permeability, surface roughness and relative humidity are needed to be improved. In order to protect the paper substrate from the water or chemicals, also for smoothing the surface, a barrier
layer must be coated on the entire substrate. Followed these backdrops, the purpose of this article is to fabricated a organic field effect thin film transistor which is a poly-3-hexylthiophene (P3HT) OTFT on flexible PP synthesis paper and PET film. Also, the requirement for morphology of PP synthesis paper is characterized. And we demonstrate the
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