Fabrication of thin films composed of redox-active complexes through layer-by-layer assembly toward improving organic transistor memories performances

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04834
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Kagawa University (2022-2023); University of Hyogo (2021)
• Principal Investigator: Tahara Keishiro 香川大学, 創造工学部, 准教授 (50622297)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 有機半導体 / 電気化学活性 / 電気化学発光 / 結晶性薄膜 / 励起状態

Outline of Final Research Achievements

The purpose of this research is to develop new functional organic semiconductors that can contribute to next-generation organic devices. Benzothienobenzothiophene (BTBT), a p-type organic semiconductor that exhibits excellent atmospheric stability and high hole mobility, was used as the core material and incorporated into the ligand skeleton, and the obtained new complex were characterized. A detailed evaluation of the photophysical properties of the platinum complex revealed that the introduction of the BTBT site caused an unusual shift in the ligand center in the excited state. The boron complex formed a column structure in which the BTBT sites were one-dimensionally stacked, achieving a dimensional transformation from the original two-dimensional herringbone structure. We have developed an electrochemiluminescence device in which the electrode is modified with this crystalline thin film.

Free Research Field

デバイス関連化学

Academic Significance and Societal Importance of the Research Achievements

近年、有機デバイスの実現に向けて、有機エレクトロニクス分野と電気化学分野のボーダーレス化が進んでおり、デバイス中枢の有機半導体材料に多重機能性を付与することが期待されている。本研究では、前者の分野における分子設計のアイデアを、後者のデバイス開発に持ち込むことができた。蓄積電荷と超分子配列を一体化して制御することで、電気化学発光を実現した点で、学術的な意義が大きいと考えられる。実用の面でも価値が高い“電流とイオンを流して光る”分子性結晶材料を創出するための知見を与える点でも、社会的な意義がある。