On January 26, 2015, a collaborative research team from the University of Tokyo and the Osaka Prefecture Industrial Technology Research Institute announced a groundbreaking development in flexible electronics. They successfully created CMOS circuits and temperature sensors using a printed technology approach, integrated with an antenna operating at 13.56 MHz, enabling the wireless transmission of temperature data. This innovation was made possible by utilizing a single-crystal organic semiconductor with a carrier mobility of 16.2 cm²/Vs—over ten times higher than conventional organic materials. Importantly, the process doesn't require vacuum conditions, significantly lowering manufacturing costs to less than one-tenth of traditional methods.
To build the CMOS circuits, the team employed their proprietary "coating crystallization method." The process involves preparing a mixed solution containing either p-type or n-type single-crystal organic semiconductor material along with a high-viscosity polymer. This solution is then applied onto a substrate. As the solvent evaporates, a polymer layer forms on the bottom, while a single-crystal organic semiconductor layer develops on top. P-type and n-type lines are alternately arranged at specific intervals, with electrodes and wiring added to create functional semiconductor components. The team has already demonstrated key digital circuits, including a D-flip-flop for memory applications and a 4-bit shift register for data transmission.
The temperature sensor leverages the temperature-dependent resistance properties of the organic polymer "PEDOT:PSS." Additionally, an organic semiconductor material was used to design a circuit that converts analog resistance values into digital signals. A rectifier circuit based on organic TFTs (fabricated using the coating crystallization technique) was also developed.
This research was part of the "Development of Plastic Electronic Labels Using Innovative Organic Transistors" project under the New Energy and Industrial Technology Development Organization (NEDO), a strategic initiative focused on energy-saving technologies. The collaboration included researchers from the Takeuya Lab at the University of Tokyo, Dr. Ueno from the Osaka Prefecture Industrial Technology Research Institute, as well as industry partners like Toppan Forms, JNC, Denso, Fujifilm, TANAKA Holdings, and Japan Electroplating Engineers.
Building on previous achievements, the team had already developed a high-performance organic TFT in 2011, a liquid crystal display driver using the coating crystallization method in 2012, and a low-cost RFID tag rectifier based on single-crystal TFTs. Looking ahead, they plan to develop RFID systems with built-in temperature sensors for practical use in logistics management. Furthermore, the newly established "High-end Organic Semiconductor Research and Development and Research Center" at the University of Tokyo will work closely with companies involved in organic semiconductor materials, panel components, and device development to advance the creation of high-speed, versatile organic electronic components.
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