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[[Vol. 42]Flexible Organic Electronic Devices for Three-Valued Logic Circuitry_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/f63c8578-dcb2-49aa-a9fa-82a4b47586f5/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.42] Flexible Organic Electronic Devices for Three-Valued Logic Circuitry](https://mdr.nims.go.jp/datasets/fb9d0354-c878-4e02-8587-76f9e642aa79)

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2022/04/04 10:04 Flexible Organic Electronic Devices for Three-Valued Logic Circuitry| MANAhttps://www.nims.go.jp/mana/research/highlights/vol42.html 1/2Previous  Index  NextResearch Highlights[Vol. 42]Flexible Organic Electronic Devices for Three-Valued Logic Circuitry29 Sep, 2018Figure: A ternary inverter based on organic electronic materials.Wearable and flexible integrated-circuit technology is on the rise, especially in the context of the‘internet of things (IoT)’ — devices sharing information through the internet. So-called organicfield-effect transistors (OFETs), built from organic molecules, are mechanically flexible, andtherefore suitable for IoT electronics. OFETs are difficult to downsize, however, making their high-density integration onto flexible chips is problematic. Yutaka Wakayama at the International Centerfor Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan, andcolleagues have now presented an alternative approach. Rather than considering OFETs offeringconventional two-valued logic — with zeroes and ones — they developed a circuit element, builtfrom organic materials, capable of handling three logical values.Multi-valued logic circuits can process more data with a lower integration density than binarycircuits. This notion inspired Wakayama and colleagues to build a ternary inverter from organicmaterials. (In three-valued logic, where an input signal can assume the values 0, 1/2 or 1, aternary inverter converts these into 1, 1/2 and 0 output values, respectively — similar to the NOTgate in binary logic.)The scientists’ inverter consists of two parts: an OFET and an element called an anti-ambipolartransistor. Although the transfer characteristics for their device did indeed correspond to three-valued logic functionality, its intrinsic operating voltage of 60 V is unrealistic for actual applications.https://www.nims.go.jp/mana/research/highlights/vol41.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol43.html2022/04/04 10:04 Flexible Organic Electronic Devices for Three-Valued Logic Circuitry| MANAhttps://www.nims.go.jp/mana/research/highlights/vol42.html 2/2By including a 30-nm thick aluminium oxide (a material with a high dielectric constant) layer in thedevice substrate, the researchers could bring the voltage down to 10 V.The anti-ambipolar transistor has the advantage that, by varying the channel length, the in- andoutput voltage ranges corresponding to 0, 1/2 and 1 signals can be tuned. Lower signal voltagesare important as they imply reduced power consumption.The researchers carried out their measurements at ambient conditions, at room temperature, anddemonstrated stability and reproducibility of the operation of the device. Wakayama and colleaguesconclude that their “organic ternary inverter has great potential as a key element of future flexibleIoT devices”.Reference“Multi-Valued Logic Circuits Based on Organic Anti-ambipolar Transistors”Kazuyoshi Kobashi, Ryoma Hayakawa, Toyohiro Chikyow, and Yutaka WakayamaJournal : Nano Lett. 18, 4355-4359 (2018).DOI : 10.1021/acs.nanolett.8b01357AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/hayakawa_ryoma?locale=enhttps://samurai.nims.go.jp/profiles/wakayama_yutakahttps://pubs.acs.org/doi/10.1021/acs.nanolett.8b01357