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Professor Munseok JEONG and researcher Ngoc Thanh Duong (in the doctor’s course) has developed a device technology through a joint research with Prof. Sungjoo LIM. The newly developed device is able to output different notation system (binary, ternary and quinary at maximum) depending on the existence of light. It has been posted on the world renowned journal ACS Nano(IF=13.709)’s April 23^rd issue.

A normal integrated circuit operates by storing either 1 or 0 as a “bit”. This is because the output of a device is recognized by two types: on and off. If an output larger than ternary notation can be realized in a device, it can extensively improve the performance of integrated circuit.

The minimal unit of computer data processing “byte” uses 8 “bit” as the standard unit. Setting 1 byte as a standard, 6561 outputs can be produced by using ternary notation. This is 25 times greater than the binary notation, which produces 256 outputs. Also, if it is possible to realize a quinary notation, the performance will improve 1000 times with just a single byte.

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2. [Thesis] inverter device that changes notation by laser reaction
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4. The research team used two-dimensional materials such as Molybdenum ditelluride (MoTe2) and Molybdenum disulfide (MoS2) compound to create Van der Waals heterojunction device. They were able to develop multi-level electronic device by using the negative differential transconductance phenomenon discovered from the heterojunction device. 
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   Prof. JEONG said, “This research is expected overcome the difficulties in 4^th industrial revolution such as the high power consumption of big data and AI and data processing speed by improving the efficiency of electronic devices.”
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   This research was conducted in support of Institute for Basic Science and National Research Foundation of Korea.