Development of terahertz optical devices based on printable heavily-doped conducting polymers

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04561
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Mie University
• Principal Investigator: Matsui Tatsunosuke 三重大学, 工学研究科, 准教授 (80452225)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 導電性高分子 / ドーピング / テラヘルツ

Outline of Final Research Achievements

The dielectric responses of the thiophene-based conducting polymer PBTTT, which is known to show high carrier mobility of 1 cm2/(V・s) and can be solution-processed, vapor-doped with accepter molecule F4TCNQ, were evaluated based on the terahertz time-domain spectroscopy (THz-TDS). The analysis based on the Drude-Smith model showed that THz dielectric responses of the PBTTT/F4TCNQ showed similar with those of the PEDOT:PSS. The highly-resistive Si substrate coated with thin layer of the organic semiconductor PCBM and deposited with very thin layer of Au showed reduced THz transmission, which suggests that the emergence of the electronic states with high carrier transport in Au/PCBM.

Free Research Field

電子材料工学

Academic Significance and Societal Importance of the Research Achievements

光波と電波の間に位置するテラヘルツ電磁波に関する科学技術は、分光分析などの基礎学術的な見地からはもとより、非接触・非破壊検査や、近年では次世代移動通信システム（B5G, 6G）での本格的な活用が見込まれており、ますます重要度が増している。そのような中、本研究ではアクセプタ分子ドープ導電性高分子PBTTT/F4TCNQあるいはAu/PCBMのテラヘルツ時間領域分光解析に関する研究を行い、高いテラヘルツ光学導電度を示すことを明らかとした。本研究で得られた成果は、新規テラヘルツ光学材料・素子の開発に資するものと考えられる。