2020 Fiscal Year Final Research Report
Improvement in Conductive Properties of Conjugated Polymer Blended in Insulating Polymer
| Project/Area Number |
19K22217
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 35:Polymers, organic materials, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
OHKITA Hideo 京都大学, 工学研究科, 教授 (50301239)
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| Co-Investigator(Kenkyū-buntansha) |
KIM HYUNGDO 京都大学, 工学研究科, 助教 (80837899)
玉井 康成 京都大学, 工学研究科, 助教 (30794268)
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| Project Period (FY) |
2019-06-28 – 2021-03-31
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| Keywords | 共役高分子 / 絶縁性高分子 / 結晶 / 非晶 / 相溶性 / 分子量 / 表面エネルギー / 太陽電池 |
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| Outline of Final Research Achievements |
We studied conductivity of various conjugated polymers blended in an amorphous insulating polymer matrix such as polystyrene. As a result, we found that most of conjugated polymers exhibit higher conductivity in such blend films than in neat films. We therefore conclude that this improvement is rather universal phenomena for various conjugated polymers. We also found that spectral change is related to the improved conductivity of conjugated polymers blended in polystyrene films. We thus conclude that the improved conductivity is due to improved electronic properties of the conjugated polymer. These improvements are dependent upon molecular weight and surface energy of the matrix polymer. This finding suggests that the conductivity of conjugated polymers can be controlled by careful selection of the matrix polymer in terms of miscibility. Furthermore, we also studied the origin of the improved hole transport in ternary blend polymer solar cells.
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| Free Research Field |
高分子光物理・光化学、高分子光・電子物性、高分子太陽電池
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果により、ポリスチレンのような非晶性の絶縁体ポリマーマトリックスに導電性高分子を少量ブレンドしたフィルムにおいて、ニート膜よりも優れた電荷輸送特性を実現可能であることが実証された。一般に、高い電気伝導特性を示すには、高結晶性の共役高分子が用いられるが、これらは柔軟性にかけウエアラブル素子への応用が難しいと考えられている。今回の研究成果を基に、高結晶性の共役高分子と非晶性高分子とのブレンド膜について適切な組合せを見出せば、高い電気伝導特性と柔軟性を両立した膜を実現できると期待される。
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