Neuromorphic device with an memristor array using diarylethenes

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05214
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Osaka Kyoiku University
• Principal Investigator: Tsujioka Tsuyoshi 大阪教育大学, 教育学部, 教授 (30346225)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: メモリスター / ジアリールエテン / 金属蒸着選択性 / 表面ガラス転移点 / マランゴニ効果 / ガラス状態 / 機能性有機材料

Outline of Final Research Achievements

We studied the potential of diarylethene (DAE) as a material with memristor function. Crossbar structure electrodes are often used as neuromorphic devices. We demonstrated a four-layer, 3-μm-wide crossbar electrode structure by maskless vacuum-deposition by utilizing selective Mg deposition, which is a function of DAE. We also clarified the surface conditions (surface softness and surface free energy) that achieve selective deposition for a variety of metals, and demonstrated maskless pattern formation of various metals such as Ag, Cu, Ni, and Cr. Although we were not able to evaluate the performance of neuromorphic devices, new research results include the discovery of the nano-Marangoni effect on the surface of organic films and the evaluation of the surface glass transition temperature based on it. We also found spontaneous movement of water-droplet on organic films having giant surface potential.

Free Research Field

機能性有機材料・デバイス

Academic Significance and Societal Importance of the Research Achievements

マスクレス蒸着による多層クロスバー電極形成は、まだ適用可能な金属種に課題を残すものの将来のAIエレクトロニクス分野におけるニューロモルフィックデバイス形成に向けた展開が期待される。多種金属種に対する蒸着選択性の実証は、様々なエレクトロニクスデバイスへの適用可能性を拓いたと言え、今後産業的な応用が期待される。有機表面におけるナノ・マランゴニ効果の発見に関しては、従来最表面のガラス転移点やその深さ分布が知られていなかったので新現象・手法として学術的意義は大きいと考えられる。