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Welcome to TAKAGI and TAKENAKA Group!
  • Publications Updated(2018/5/30) NEW
  • A following paper was published(2017/7/31)
    J.-H. Han, F. Boeuf, J. Fujikata, S. Takahashi, S. Takagi, and M. Takenaka, “Efficient low-loss InGaAsP/Si hybrid MOS optical modulator,” Nat. Photonics, vol. 11, no. 8, pp. 486–490, Jul. 2017. DOI: 10.1038/nphoton.2017.122
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The performance of Si LSIs has been enhanced over 40 years by increasing the number of transistors with the Moore's law. However, the device scaling is approaching to the physical limitation because the gate length has been alreday scaled to less than 20 nm. In the next 10 - 20 years, the device scaling will end. Thus, we cannot expect further enhancement in the LSI performance by the device scaling.

On the other hand, more computing power will be required because of the emergence of IoT and AI applications. Hence, the next-generation computing technologies has intesitvely been investigated to enhance the LSI performance without the device scaling. We are conducting researches on next-generation semiconductor devices for AI and IoT applications. Based on the heterogeneous integration of III-V semiconductors, Ge, and 2D materials on Si, we have investigated transistors and Si photonics.

As the "More Moore" approach, we have investaiged MOSFETs based on high-mobility channel materials such as III-V semicondutors and Ge. We have also investigated 2D materials for ultra-scaled MOSFETs. As the "More than Moore" approach, we have conducted the research on on-chip optical interconnect using Si photonics. Optical sensing chips based on photonics integrated circuits have also been investigated for IoT applications. As the "Beyond CMOS" approach, we are seeking new priciple for transistors including Tunnel FET and Ferroelectric FET. We have also investigated deep learning using Si photonic integrated circuits.

Main research topics:

  • Tunnel FETs
  • On-chip interconnect using Si photonics
  • Deep learning using Si universal photonic integrated circuit
  • Ge mid-infrared photonic integrated circuit
  • 2D material electronics and photonics

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