Development of high-performance quinoid-based semiconducting polymers

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22535
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Hiroshima University
• Principal Investigator: Mikie Tsubasa 広島大学, 先進理工系科学研究科(工), 助教 (40881280)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 有機半導体材料 / π共役系ポリマー / 半導体ポリマー / キノイド骨格 / 有機電界効果トランジスタ / 有機エレクトロニクス

Outline of Final Research Achievements

Rational design of π-conjugated polymers for improving “intrachain” charge carrier transport along the backbone still remains a formidable challenge. In this study, we designed and synthesized new π-conjugated polymers based on non-fused and fused ring quinoid structures. Careful investigation of electronic properties, associated with the structural analysis of the model compounds, structural orders, and theoretical band simulations suggested that highly π-electron delocalization along the π-conjugated backbone resulted in the greatly improved intrachain charge carrier transport and thus the remarkably high mobility in the π-conjugated polymer. We believe that our study would provide new guidelines for the design of π-conjugated polymers with high intrachain charge carrier transport.

Free Research Field

化学

Academic Significance and Societal Importance of the Research Achievements

従来のポリマー主鎖間の電荷輸送性を改善するという開発指針に基づいた研究では、π共役系ポリマーの電荷移動度は頭打ちになりつつあった。本研究成果により、ポリマー主鎖内の電荷輸送性向上が可能となったことで、今後、さらにπ共役系ポリマーの高移動度化が進むことが期待される。高移動度ポリマーの開発により、有機トランジスタのみならず有機薄膜太陽電池や有機熱電変換素子など、様々なプリンテッドデバイスの性能が飛躍的に向上し、IoT社会、低炭素化社会実現に大きく貢献することができる。