Development of Electron-rich Thiophene Oligomer-type Highly conducitive Materials: Dimensionality Expansion Strategy via Hydrogen-bond Formation

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05018
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
• Research Institution: The University of Tokyo
• Principal Investigator: Fujino Tomoko 東京大学, 物性研究所, 助教 (70463768)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 有機伝導体 / オリゴマー / 単結晶 / 電気伝導性

Outline of Final Research Achievements

The use of π-conjugated system conductive polymer material has become widespread in current organic electronic devices. However, obtaining detailed structural and mechanism information is difficult due to structural disorder, and there is no established guideline for achieving high conductivity. In this study, we developed a series of single-crystalline oligomeric conductors from which the basic framework of a conducting polymer was extracted. By studying the structure-property relationship and utilizing the high degree of molecular design freedom inherent in oligomers, we were able to control the electronic structure based on the modulation of chain length, arrangement, dimensionality, and band filling. As a result, the electrical conductivity at room temperature was improved by six orders of magnitude. Additionally, metallic electronic states can be realized above room temperature.

Free Research Field

固体物性化学

Academic Significance and Societal Importance of the Research Achievements

高分子と低分子の中間に位置するオリゴマー材料は，その構成ユニットの種類、配列情報によって立体空間を制御可能な優れた特性を示す優れた伝導性材料であることを見出した．オリゴマー集合体の立体空間と電子機能を制御するという伝導体材料開発のための新しいコンセプトが実証されたものといえる．オリゴマー材料は、物質設計度が高く，レアメタルフリーで安価な原料から合成できる軽くて柔らかい新材料であり，有機伝導体材料や有機電子デバイス開発における技術革新をもたらしうるものと期待される．