A research team composed of the University of Tokyo and the Osaka Prefecture Industrial Technology Research Institute and others announced on January 26, 2015 that CMOS circuits and temperature sensors are made using printed technology and connected to an antenna for 13.56MHz, which can be successfully Send temperature data. This achievement was achieved using a single crystal organic semiconductor with a carrier mobility of 16.2 cm2 / Vs, which is more than 10 times higher than traditional organic materials. Since no vacuum process is required, the manufacturing cost can be reduced to less than one tenth of the original.
When forming a CMOS circuit, the "coating crystallization method" developed by the research team was used. The specific step of the coating crystallization method is to prepare a mixed solution doped with a p-type or n-type single crystal organic semiconductor material and a polymer with a relatively high viscosity, and then apply the mixed solution on the substrate. When the solution is evaporated to dryness, a polymer layer is formed on the bottom and a single crystal organic material layer is formed on the top. P-type lines and n-type lines are alternately arranged at a certain distance, and electrodes and connection wiring are drawn on them, thereby forming a semiconductor element. In terms of digital circuits, a D-flip (Flip-Flop) circuit required for memory implementation and a 4-bit shift register required for data transmission have been formed.
The realization of the temperature sensor utilizes the characteristic that the resistance of the organic polymer material "PEDOT: PSS" changes with temperature. In addition, an organic semiconductor material is also used to form a circuit that converts analog resistance data into digital data. In addition, a rectifier circuit using organic TFT elements (based on the coating crystallization method) is also available.
The research was carried out as the subject of "Development of Plastic Electronic Labels Using Innovative Organic Transistors" in the "New Energy Industry Technology Development Agency (NEDO)", a strategic energy-saving technology innovation project. The research team of Takeuya Lab of the University of Tokyo, the chief researcher of Ueno, Osaka Prefecture Industrial Technology Research Institute, Toppan Forms, JNC, Denso, Fujifilm, TANAKA Holdings and Japan Electroplating Engineers participated in the study.
The research team has successfully developed a high-performance organic TFT using single-crystal organic materials in 2011, successfully developed a liquid crystal display driver using a coating crystallization method in 2012, and successfully developed a single-crystal Relevant achievements of crystal TFT's low-cost RFID tag rectifier have been released. In the future, we will promote the development of RFID for logistics management equipped with temperature sensors for practical use. In addition, the "High-end Organic Semiconductor Research and Development and Research Center" established at the University of Tokyo will conduct joint research with companies engaged in the development of organic semiconductor materials, panel components, device development, and component development to promote the development of a wide range of uses High-speed organic electronic components.
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