Quantum Materials Field
Quantum Device Engineering Group

Designing next-generation device architectures using antiambipolar transistors

Group Leader: Yutaka Wakayama

Next-Generation Semiconductor, Nanostructures and devices

Current Topics

We investigated two types of in-memory logic operations: reconfigurable two-input logic circuits and multifunctional artificial synapses. These were realized in a dual-gate antiambipolar transistor with a ReS₂/WSe₂ heterojunction and a zinc phthalocyanine-cored polystyrene film as memory layer.
In-memory logic circuits using AATs
Fig. 1. Reconfigurable logic-in-memory circuits and multifunctional synapses using dual-gate AATs.

Outline of Research

We have been developing a new type of logic circuits to overcome the limits of modern von Neumann type device architectures. A key element is an antiambipolar transistor (AAT), where a p-n heterojunction plays critical role in controlling electrical currents. The uniqueness of AATs can be ascribed to their distinctive electrical properties; negative differential transconductance can be manipulated in the wide range of 101–104. By taking this advantage, we have developed multi-valued (ternary and quaternary) logic circuits, reconfigurable logic gates, optically controllable logic-in-memory and artificial synaptic devices. These logic operations have been developed with organic semiconductors and two-dimensional atomic layers.

References

  1. Y. Shingaya, T. Iwasaki, R. Hayakawa, S. Nakaharai, K. Watanabe, T. Taniguchi, J. Aimi, Y. Wakayama, ACS Appl. Mater. Interfaces 16 , 33769 (2024). DOI: 10.1021/acsami.4c06116
  2. Y. Shingaya, A. Zulkefli, T. Iwasaki, R. Hayakawa, S. Nakaharai, K. Watanabe, T. Taniguchi, Y. Wakayama, Adv. Electron. Mater. 9 , 2200704 (2022). DOI: 10.1002/aelm.202200704

Group members

  • Profile image
    Yutaka Wakayama
    ・Group Leader
    ・Manager of Administrative Office
  • Profile image
    Ryoma Hayakawa
    ・Principal Researcher

Activities

  • Feb. 22, 2024
    Advancing Organic Circuits: MANA Study Changes the Current Computing Architecture
  • Mar. 4, 2024
    The Collaborative Research Achievement by Daiki Nishioka, Trainee, Takashi Tsuchiya, Principal Researcher, and Their Collaborators Featured in the Media
  • April 18, 2024
    NIMS-NTU Joint Symposium (2024 Spring)
  • Aug. 22, 2024
    From Bottleneck to Breakthrough: MANA Achieves New Computing Paradigm with Reconfigurable Logic Circuits
  • Sep. 6, 2024
    Joint workshop Novel Materials and Devices for Neuromorphic Applications
  • Oct. 25, 2024
    Joint workshop LANL/NIMS Quantum and Functional Materials and MANA International Symposium 2024

Quantum Materials Field Nanomaterials Field Independent Researcher Satellite Principal Investigator