Professor Lee Sang-wook and His Team’s Research Achievement Publishes in Advanced Functional Materials
- 작성처
- Date2021.07.27
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Professor Lee Sang-wook and His Team’s Research Achievement Publishes in Advanced Functional Materials
A research team led by Professor Lee Sang-wook from the Department of Physics developed a new type of 2D transistor that can direct the flow of electric currents in a split state into top and bottom layers or a coupled state in one material. This study result was published in Advanced Functional Materials (IF 18.808), a distinguished academic journal in materials science, on June 2 (Wed).
Ever since Russian physicists Andre Geim and Konstantin Novoselov earned the Nobel Prize in Physics by discovering graphene, a graphite-derived 2D material composed of a single layer of atoms, studies on the various quantum properties of matter and applied devices on 2D materials have been actively conducted. A 2D material refers to a material arrayed with a single layer of nano-sized atoms. Studies have identified that electrical charges move relatively freely on a 2D plane, while their movement between 2D layers differs based on the electron structure of materials.
The research team garnered significant attention by designing and realizing a new idea to separate the flow of electric charges into top and bottom layers or couple them in a 2D material using ReS2, a kind of chalcogen compound composed of single-layered transition metal.
The team fabricated a dual gate transistor device, consisting of a gate electrode attached to the top and bottom layers of ReS2, and controlled gates in the top and bottom to identify the independent flow of electric currents on each layer. In addition, they enhanced the performance of the transistor and conducted performance optimization analyses of the transistor using diverse methodologies. As a result, they were able to physically identify the weak interlayer coupling of ReS2, and controlled the said characteristic to succeed in developing a new type of transistor that allows the two channels’ independent operation or interaction to take place in one 2D material.
Professor Lee commented, “Based on this study’s results, we were able to gain insight into developing a system that can artificially control interlayer coupling by controlling the intervals or layup angles of 2D materials,” and added, “We aim to further develop a system that can express the new quantum properties of matter in 2D materials using this idea.”
This study was jointly conducted by Professor Lee Sang-wook (co-corresponding author) and a research team from Ewha, a research team from the Interuniversity Microelectronics Center (IMEC), Europe’s largest nano and semiconductor technology research organization (including first author Dr. Lee Kook-jin), and a research team from Korea University.