# Fileset

[[Vol. 77]New TEM Technique Creates 2.8nm Transistor_WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/fe7afd37-defa-4cae-9ab6-49473e791d29/download)

## Creator

International Center for Materials Nanoarchitectonics (WPI-MANA)

## Rights

In Copyright[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[[Research Highlights Vol.77] New TEM Technique Creates 2.8nm Transistor](https://mdr.nims.go.jp/datasets/df4703ad-5a80-4927-a54f-4d6f6764755c)

## Fulltext

2022/11/02 16:51 New TEM Technique Creates 2.8nm Transistor| MANAhttps://www.nims.go.jp/mana/research/highlights/vol77.html 1/2Previous  Index  NextResearch Highlights[Vol. 77]New TEM Technique Creates 2.8nm Transistor26 Jul, 2022An international research team at WPI-MANA has used a transmission electron microscope(TEM) to create a 2.8nm transistor consisting of nanochannels embedded in metallic carbonnanotubes (CNTs), which exhibits quantum transport at room temperature.One major aim of nanotechnology research is to control the helical structure of a CNT. This structuredetermines the nanotube’s properties, and altering it can result in drastic changes, such as turning itfrom a metal to a semiconductor. To achieve this, the focus has been on growing nanotubes to controlthe structure, but this has been very difficult due to their extremely small size, only one or twonanometers in diameter.To address this difficulty, researchers at WPI-MANA have developed a technique to preciselymanipulate individual CNTs and alter their helical structure inside a TEM.The WPI-MANA team used nanoprobes to apply tension and heat to the CNT. This deformed a sectionof the nanotube, altering its structure and changing it from a metal into a semiconductor.The section of the altered nanotube was very short, and formed a semiconductor embedded in ametallic nanotube. The researchers believe this can be used as a semiconductor channel, and with theoriginal metallic nanotube as the source and drain, the effect is like a molecular transistor embeddedinside the nanotube.https://www.nims.go.jp/mana/research/highlights/vol76.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol78.html2022/11/02 16:51 New TEM Technique Creates 2.8nm Transistor| MANAhttps://www.nims.go.jp/mana/research/highlights/vol77.html 2/2Dr. Dai-Ming Tang, leading member of the team, said, "This transistor is extremely small, only 2.8nmin channel length, shorter than any current silicon-based transistors. In fact, this is among the world’ssmallest transistors, and we created it by using our new technique."Another exciting aspect of this work relates to the behavior of materials on such tiny scales. "Becausewe can make such a very small transistor, other effects appear," Dr. Tang said. "For example, we haveseen quantum transport at room temperature, which is usually observed only at extremely lowtemperatures."This could allow the density of transistors on a computer chip to be much higher, leading to morepowerful and faster electronics.This research was conducted by Daiming Tang (Senior Researcher, Functional Nanomaterials Group,WPI-MANA, NIMS) and his collaborators.Reference“Semiconductor nanochannels in metallic carbon nanotubes by thermomechanical chirality alteration”Dai-Ming Tang et al.Journal: Science, 374, 1616-1620 (24 December 2021)DOI : 10.1126/science.abi8884AffiliationsInternational 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.jpTo receive our e-mail newsletter “MANA Research Highlights”, please send an e-mail with "MANA ResearchHighlights request” in the subject line or main text to the following address: mana-pr_at_ml.nims.go.jp *Please change "_at_ " in the email address to @.https://samurai.nims.go.jp/profiles/tang_daiming?locale=enhttps://samurai.nims.go.jp/profiles/tang_daiming?locale=enhttps://www.science.org/doi/10.1126/science.abi8884