Development of nonfullerene acceptors having high dielectric constants for realization of innovative solar cell mechanism

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02814
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Osaka University
• Principal Investigator: IE YUTAKA 大阪大学, 産業科学研究所, 教授 (80362622)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 有機半導体 / 有機太陽電池 / アクセプター / 誘電率 / 非フラーレン型材料

Outline of Final Research Achievements

Organic solar cells (OSCs) are regarded as the promising candidates for next-generation solar cells. To improve the power conversion efficiency of OSCs, it is essential to reduce voltage losses. The critical problem of voltage loss is related to the large exciton binding energy (low dielectric constant) of organic semiconducting materials. To solve this problem, we focused on the development of organic semiconducting materials with high dielectric constants. In particular, we focused on the development of nonfullerene acceptors with high dielectric constants. As a result, we found that the exciton binding energy is affected by the molecular structures and electronic structures. Furthermore, we found a correlation between the exciton binding energy and the power conversion efficiency of OSCs.

Free Research Field

有機機能材料

Academic Significance and Societal Importance of the Research Achievements

OSCは軽量、フレキシブル、プリンタブル、波長選択性などの有機半導体材料ならではの特徴をもつことから、次世代太陽電池として研究開発が盛んに行われており、近年では19%を越える高い性能が見出されつつある。本研究成果を活かすことで、新機軸の高性能な有機半導体材料、特に、アクセプター材料の開発が可能になることから、電圧損失の低減に基づくOSCのさらなる発電効率の向上が視野に入り、社会実装に向けた研究開発が加速すると期待できる。