Jae-sung Park, Principal Researcher at the KRISS Electromagnetic Standards Center, is growing high-quality silicon carbide graphene.
[Asia Economy Reporter Junho Hwang] Domestic researchers have developed a new standard resistor device that contributes to the next-generation quantum electrical standard system. Since it enables the direct establishment of standard resistor devices previously imported from overseas, it is expected to serve as an opportunity to establish a national resistance standard system. The Korea Research Institute of Standards and Science (KRISS) announced on the 8th that it has succeeded in developing a new standard resistor device contributing to the next-generation quantum electrical standard system.
Using Graphene as a Standard Resistor Device
The standard resistor device developed by the KRISS Electromagnetic Standards Center research team utilizes silicon carbide graphene, a material known as a dream material. Compared to the existing GaAs (gallium arsenide) semiconductor-based quantum Hall devices, it can implement standard resistance in an efficient experimental environment at higher temperatures (above 4.2K) and lower magnetic fields (below 5T).
The research team, consisting of Dr. Jaesung Park, Donghoon Chae, and Wanseop Kim, grew high-quality silicon carbide graphene at high temperatures above 1600℃ and developed device process technology suitable for it. Using this, they succeeded in fabricating a graphene-based quantum Hall single standard resistor (12.9 kΩ) and a '129 kΩ graphene-based quantum Hall high-resistance array device' consisting of 10 devices connected in series.
Third After Germany and the United States
Quantum Hall Effect and Characteristic Evaluation of Graphene-Based High-Resistance Devices
This is the third instance of growing graphene and implementing it as a quantum Hall single device after Germany and the United States. In particular, the implementation of a 'precision quantum Hall high-resistance array device' connecting 10 quantum Hall single devices in series is the world's first.
Through this research result, KRISS has also established a national resistance standard system. Since 2008, KRISS has independently developed a quantum Hall resistance precision measurement system and has been establishing and maintaining the national resistance standard system. However, the standard resistor devices were imported from overseas measurement standard institutions.
Principal researcher Jaesung Park stated, "KRISS plans to distribute the standard resistor devices produced in-house to overseas measurement standard institutions for international comparison starting this year," adding, "This achievement can be applied to the quantum current standard field and will greatly contribute to improving the reliability of devices that use fine current measurement and generation technology."
This research result was published in the March issue of Applied Physics Letters, an international journal in the field of applied physics.
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