Institute for Basic Science Succeeds in Synthesizing 10,000 Times Bigger Two-Dimensional "White Graphene (h-BN)" (May 23)
- IBS Manufactures 100㎠ Two-Dimensional Monocrystal Boron Nitride and Results Were Published on the Online Edition of Nature
- IBS Discovers Principle of Manufacturing Two-Dimensional Monocrystals, Opening Way for Commercial Rollable Display
□ The research team led by Professor Feng Ding (UNIST's Distinguished Professor), the leader of Multidimensional Carbon Materials Research Group at the Institute for Basic Science (IBS), collaborated with researchers from China and Switzerland and developed the core technology for commercializing low-power, high-functioning rollable display.
o The team succeeded in manufacturing monocrystal* two-dimensional white graphene, whose maximum size only stood at a few square millimeters previously, in a maximum size of 100㎠, which is large enough to be used in semiconductor manufacturing process right away.
* Monocrystal: Material whose constituents are arranged in a highly ordered structure. It conducts heat and electricity well, so it is very high functioning and consumes less power when used in electric devices.
** Two dimensional white grapheme (h-BN): Two dimensional material composed of boron (B) and nitride (N), shaped in a triangle with a thickness of one or two atoms. Unlike grapheme, it can be used for two-dimensional nonconductor because it is an insulating material.
o The MSIT and the IBS announced that the research results were published on the online edition of the world-renowned Nature (IF 41.577) at 2:00 am (KST) on May 23.
□ Commercial rollable display requires flexible two-dimensional material (with a thickness of one or two atoms) instead of hard silicone. Using monocrystal will enhance the device's function.
o Up until now, two-dimensional monocrystal material has never been manufactured in a size large enough to be commercialized, except graphene.
o Through simulations, the researchers discovered a formula for growing a variety of large-area, two-dimensional monocrystals using a substrate with a lower surface symmetry* than the desired material for synthesis.
* Symmetry: the quality of remaining invariant when rotated 360 degrees. Hexagonal graphene remains invariant when rotated 60 degrees, and triangular h-BN remains invariant when rotated 120 degrees.
o Inspired by this principle, researchers succeeded in manufacturing large-size (10x10cm), two-dimensional, nonconducting monoscrystal white graphene, using copper substrate, which has a low surface symmetry.
o It is impossible to produce a semiconductor that can be turned on and off using conducting graphene*. However, when conducting graphene and nonconducting white graphene are layered on top of another, it is possible to realize a thin, flexible, high-functioning, low-power semiconductor that has a thickness of a few atoms, without going through a special processing.
* A new material of dream that has a speed of electron 100 times faster than that of silicone and a thickness of almost zero.
□ The research made it possible to use quality two-dimensional material, which was difficult to commercialize due to the lack of technology for large-size manufacturing, in the industry.
o White graphene is highly resistant to heat and even to radioactivity, so it can be widely adopted not only in electronic devices but in things that need to be light and require thermal and chemical stability, such as airplanes and spaceships.
□ Professor Feng Ding said, "Two-dimensional material is excellent by itself, but it is truly great when it is layered with other materials. It has opened doors for the next-generation semiconductor market after silicone. It will contribute to realizing electronic devices with a whole new properties of matter."