|Title:||High performance printed organic transistors using rubrene and self-assembled monolayer (SAM) for RFID tags|
|Subject:||Hong Kong Polytechnic University -- Dissertations.|
Organic field-effect transistors.
Radio frequency identification systems.
|Department:||Department of Electronic and Information Engineering|
|Pages:||128 leaves : ill. ; 30 cm.|
|Abstract:||With globalization, bigger and bigger supply chain networks are developed and organizations ranging from consumers to International Corporation have much interest in improving supply chain performance so as to increase business success (higher profits, higher market share, leading position, added value, better image, better management, competitive advantage, higher security, better military moving, new opportunities, monopolistic competition and etc.) , and this is for obvious reason. According to the paper  on Market Research on Price, to make RFID widely used in daily environment such as supermarket items, the price of a tag must be cheaper than US$0.05 cent. However, in foreseeable 10 years, it is impossible for a silicon tag to be cheaper than US$0.2 cents. It is because silicon chips requires quite expensive and strict fabrication processing and highly clean environment. To break this bottleneck, organic RFID tag is developed. With printing organic ink to a plastic substrate layer by layer, the price of a functional Organic RFID tag can be lower than US$0.05 cent. The primary goal of printing organic electronics is to create structures that are functionally similar to conventional electronics but at a far greater production speed, lower cost, and with less manufacturing complexity. These advantages may be possible in large part due to the shift from high vacuum, high purity integrated circuit (1C) manufacturing to printing processes operating at room temperature in ambient conditions. From the technical point of view, RFID Tag circuits, for both silicon and organic ones, require at least three functional components: a conductor, a semiconductor, and a non-conductor (dielectric). A combination of these components can be used to form wires, resistors, capacitors, field effect transistors (FET), and the like. These components can be combined to form functional circuits, and ultimately complete electronic systems. In other words, the main critical factor to determine the performance of organic RFID tags is individual Organic Thin Film Transistors (OTFT). Up to time being, Pentacene as organic semiconductor is most extensively researched, so it is a good starting point to study OTFT. According to the handbook  "Introduction to organic electronic and optoelectronic materials and devices, Rubrene is found to have the about 6 times higher mobility than Pentacene, and they share the same hole-transporting mechanism so Rubrene and Pentacene are inter-exchangeable in the following theoretical analysis. Because most of the latest technologies available for OTFT are published in research conference and professional articles within one to two years, which are not found in any text book yet. Therefore some relevant important experiment results will be quoted in this paper for reference and comparison so that readers could understand the ideas and significance behind. Ideally, organic TFT process similar structure with silicon transistors but with much lower cost. However, one factor that makes them different is the Turn-on voltage. For typical OTFT, it is 15-20 V, 10 times larger than 1 -3 V of silicon ones. This has great influence on the design of passive RFID tags. The present concept of silicon RFID and 1C design is useful but need injection of new ideas and optimization for organic ones. While the logical processing required by a typical protocol is modest compared to modern processor capabilities, design of tag ICs is absolutely challenging due to the intersection of two constraints: very low cost and marginal power. Careful attention to individual aspects of the design, including hand routing and analog simulation, is required. The 1C, strap, antenna, and substrate form an inlay, which may be laminated into a printable and thus human-readable label to be used. Yet, improvements in tag life expectancy and durability still need for wide implementation. The aim of this thesis is to deliver the message on RFID importance and combine individual techniques using my original ideas to provide a theoretical analysis on developing promising and feasible manufacturing technologies, process and strategies for mass production of low-cost marketable Printed Organic RFID Tags.|
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