Printed Organic Electronic Devices Made using High Volume Printing Processes
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Printed Organic Electronic Devices Made using High Volume Printing Processes Yu Xia2, Anupama Karwa2, Franz Sigg3, Daniel M. Clark4, and Bruce E. Kahn1,2* 1. Imaging and Photographic Technology, Rochester Institute of Technology, Rochester, NY 14623 2. Center for Materials Science and Engineering, Rochester Institute of Technology, Rochester, NY 14623 3. School of Print Media, Rochester Institute of Technology, Rochester, NY 14623 4. Printing Applications lab, Rochester Institute of Technology, Rochester, NY 14623 ABSTRACT Printing is a promising technique to fabricate commercial organic electronic devices such as OLED, TFT, solar cells and sensors. In this investigation, we report the application of high volume flexographic printing, which makes low cost and batch production possible. Commercial RFID tags have been printed using metallic inks with organic compounds in the Printing Applications Lab (PAL) at Rochester Institute of Technology (RIT). Polyaniline ink was prepared and printed by flexography in the form of test targets and Interdigitated electrodes (IDE). The conductivity can be controlled by different levels of doping. Furthermore, multiple impression printing was used to print overlapping functional layers to obtain all printed organic electronic devices like chemical vapor and humidity sensors. Optical profilometry and SEM were used to analyze the surface and interface structure. Sensitivity was measured and compared with commercial devices.
fast-drying inks. It is a high-speed printing process and can print continuous patterns on many types of absorbent and non-absorbent materials. Polyaniline sensors are generally made as resistance-type, known as chemiresistors. The ink is deposited on the substrate and is connected by two electrodes. Exposure to certain kinds of vapors leads to either chain structure modification or chemical reactions on [6] the polymer backbone , resulting in a change in conductivity. It can be recorded using an ohmmeter. The performance of a polyaniline sensor can be improved by 1) decreasing the distance between the electrodes to shorten the electron transfer time. 2) decreasing the thickness of the active layer to make diffusion easier. 3) using nanostructured polyaniline to expand the effective surface area. The sensor demonstrated in this paper has an inter-electrode distance about 100 µm and thickness less than 5 µm.
INTRODUCTION SENSOR FABRICATION Conventional microelectronic devices have been spectacularly successful in supporting the development of the world. However, they suffer a number of limitations, for example, providing electronic functions at very low cost, ultimate limits to feature sizes, and the ability to manufacture them over large areas or on arbitrary (flexible) surfaces. Alternatively, there is increasing interest in active thin film electronics，and printing is a promising method to manufacture these devices. Devices fabricated by different printing techniques like inkjet, gravure, screen, microcontact printing, etc. have been reported [2-5] whi
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