2018 Fiscal Year Annual Research Report
Fundamental Studies of Excitons and Charge-Carriers in Organic Materials Relevant to Organic Electronics
| Project/Area Number |
17H06791
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| Research Institution | Kyoto University |
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Principal Investigator |
Park Jaehong 京都大学, 工学研究科, 講師 (00802224)
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| Project Period (FY) |
2017-08-25 – 2019-03-31
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| Keywords | Organic semiconductor / Polymer self-assembly / Photophysics |
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| Outline of Annual Research Achievements |
With inherent solid-state structural (crystalline/amorphous) complexity in polymer-based condensed-phase materials, the current understanding on photoinduced exciton/carrier dynamics and exciton/carrier transport over interfaces is limited. To overcome this hurdle, we have achieved facile synthesis of conjugated polymer particles (CPPs) whose internal structure features pure crystalline domains. We performed structural characterization on CPPs obtained from regioregular poly(3-hexylthiophene) (rr-P3HT), using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and these results confirm their highly pure crystallinity that extends over 100s of nm. Even after solvent evaporation, therefore no additional molecular packing within crystalline domains is observed from the UV-vis spectroscopy. This opens new opportunities to investigate exciton/carrier dynamics only within a pure crystalline domain or at the interface between only crystalline and electron acceptors.
Additionally, in our effort to understand structure-property relations in organic-based materials, we utilized metal-organic frameworks (MOFs) featuring pyrene as an organic photoactive unit. In the excited-state studies of two MOFs (NU-901 and NU-1000), which are chemically identical (Zr6(μ3-O)4(μ3-OH)4(-OH2)4(TBAPy)2), while topologically distinguished, we showed that due to the topological difference, NU-901 contrastingly forms excimer to NU-1000. This study demonstrates that the topological control can modulate the fate of excited-states.
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| Research Progress Status |
平成30年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
平成30年度が最終年度であるため、記入しない。
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