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Phase change behavior of a nitride material and its application in PCRAM device

Research Project

Project/Area Number 22K20474
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

SHUANG YI  東北大学, 材料科学高等研究所, 助教 (10962144)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords相変化材料 / 相変化メモリ / 窒化物 / 不揮発性メモリ / アモルファス相 / 結晶相 / 不揮発メモリ / CrN
Outline of Research at the Start

次世代不揮発性メモリとして相変化メモリ(PCRAM)が注目されている。現在、相変化材料にはGe-Sb-Te化合物(GST)が実用されているが、将来に向けては、PCRAMの高温環境利用や更なる微細化、省動作エネルギー化が強く望まれている。但し、GSTアモルファス化には材料を融解しなければならず、動作エネルギー(熱エネルギー)がどうしても高くなってしまうという本質的な材料的問題を抱えている。本研究では、世界に先駆けて、アモルファス相を介さない相変化により大きな抵抗変化を示す窒化物系を提案し、その相変化メカニズムを究明し、窒化物相変化メモリの実現を目指す。

Outline of Final Research Achievements

In the case of the conventional Ge-Sb-Te (GST) amorphous/crystalline phase transition, the low thermal stability of the amorphous phase requires a significant amount of energy to melt the material. However, in this study, CrN proposed can achieve ultra-low energy operation without going through the amorphous phase, and the realization of PCRAM with greatly reduced energy consumption is highly anticipated. In this study, we investigated the phase transition behavior of CrN, fabricated CrN devices, and evaluated them. Measurement results show that CrN phase change devices achieve operating speeds approximately 10 ns faster and a reduction in energy consumption by an order of magnitude compared with GST. Additionally, the drift of memory devices is small, and the rewriting performance is excellent.

Academic Significance and Societal Importance of the Research Achievements

本研究の新しい窒化物系の相変化材料を探究することで、従来のカルコゲナイド系相変化材料の枠を拡大することが可能になる。本研究の達成により、電子デバイスの飛躍的な高性能化や、次世代高速大容量不揮発性メモリを要する人工知能分野への応用も大いに期待される。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (6 results)

All 2024 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Direct observation of phase-change volume in contact resistance change memory using N-doped Cr2Ge2Te6 phase-change material2024

    • Author(s)
      Shuang Yi、Ando Daisuke、Song Yunheub、Sutou Yuji
    • Journal Title

      Applied Physics Letters

      Volume: 124 Issue: 6

    • DOI

      10.1063/5.0190632

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] NbTe<sub>4</sub> Phase‐Change Material: Breaking the Phase‐Change Temperature Balance in 2D Van der Waals Transition‐Metal Binary Chalcogenide2023

    • Author(s)
      Shuang Yi、Chen Qian、Kim Mihyeon、Wang Yinli、Saito Yuta、Hatayama Shogo、Fons Paul、Ando Daisuke、Kubo Momoji、Sutou Yuji
    • Journal Title

      Advanced Materials

      Volume: 35 Issue: 39 Pages: 2303646-2303646

    • DOI

      10.1002/adma.202303646

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Phase-change Chromium Nitride2023

    • Author(s)
      Yi Shuang, Shunsuke Mori, Takuya Yamamoto, Shogo, Hatayama, Yun-Heub Song, Jin-Pyo Hong, Daisuke Ando, Yuji Sutou
    • Organizer
      E/PCOS2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 酸素ドーパントによるCrN薄膜のP-N変換2023

    • Author(s)
      Yi Shuang and Yuji Sutou
    • Organizer
      日本金属学会2023年春期(第172回)講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] P-N conversion of CrN films by oxygen incorporation and their thermoelectric properties2022

    • Author(s)
      Yi Shuang and Yuji Sutou
    • Organizer
      2022 MRS Fall Meeting & Exhibit
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 抵抗変化材料、スイッチ素子用材料、スイッチ層、スイッチ素子及び記憶装置2023

    • Inventor(s)
      須藤 祐司、SHUANG YI
    • Industrial Property Rights Holder
      須藤 祐司、SHUANG YI
    • Industrial Property Rights Type
      特許
    • Filing Date
      2023
    • Related Report
      2023 Annual Research Report

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Published: 2022-09-01   Modified: 2025-01-30  

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