Research

• Semiconductor nanowires.

• 2D Materials: Graphene, h-BN, TMD, Weyl semimetals, and etc.

Low-dimensional semiconductors changes their intrinsic physical properties. It has widely attracted much attention of the scientific and engineering fields not only to find the unique electrical and optical properties of materials, but also to apply them to the future multifunctional devices. For examples, the silicon nanowire can be utilized as the electrical channel with their high mobilities, also be a charge trap block by controlling their surface nano structures. Those new properties enables us to develop the new optically controlled transistors without a gate structure. 2D materials will open new era of future devices. They are basically atomically thin layers with all material properties such as metal, insulator, and semiconductor. They are transparent, flexible, electrically and optically active. Beyond the conventional properties, Weyl semimetals and other TMDs show various non-linear dynamics and quantum phenomena. 

Under construction

• Transistors, LEDs, and photodetectors.

• Neuromorphics.

To take the advantage of unique physical properties of nano materials, we develope new multifunctional devices. For examples, the optical transistors without gate structures (Nat. Nanotechnol. 12, 963-968 (2017)), high-quality nano light-emitting devices, high efficiency nano photodetectors, nano neuromorphics, and etc. Those nano devices can be not only flexible, but also transparent, which enables to form the future wearble devices. In particular, the nano neuromorphic devices have much attention as one of the most promising basic artificial intelligence hardwares.