Low Temperature Photochemical Sol-Gel Processing of Functional Thin Films and their Applications
| Project/Area Number |
20J40137
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Review Section |
Basic Section 29020:Thin film/surface and interfacial physical properties-related
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| Research Institution | Yamagata University |
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Principal Investigator |
孫 麗娜 山形大学, 有機エレクトロニクスイノベーションセンター, 特別研究員(RPD)
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| Project Period (FY) |
2020-04-24 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | flexible electronics / electron injection layer / zinc oxide / metal-organic / solution processing / dielectric material / inverted IOLEDs / Znic-alkoxides / vacuum ultraviolet / photochemical conversion / metal oxide thin films / photoluminescence / thin film encapsulation / light emitting diode / low temperature |
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| Outline of Research at the Start |
The project aims establishing general methodologies to achieve precise control of metal-oxide thin films in their low temperature photochemical processing by vacuum ultraviolet (VUV) light for realization of roll-to-roll fabrication of flexible electronics. Selection of precursor solutions, tuning of VUV conditions, as well as designing architectures of multilayers are considered to achieve various functionalities.The performance of thus obtained thin films is to be tested and improved in their use as carrier transport / emission layers and thin film encapsulation in optoelectronic devices.
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| Outline of Annual Research Achievements |
The project aims to develop general methodologies for the precise control of functional inorganic thin films in their low temperature solution processing for the realization of roll-to-roll fabrication of flexible electronics. This year, it was found that solution-processed amorphous metal-organic thin film zinc(II) methoxyethoxide (ZME) acts as an efficient and stable electron injection layer (EIL) in inverted organic light-emitting diodes (iOLEDs). In contrast, crystallized ZnO obtained either by utilizing vacuum ultraviolet (VUV) light irradiation or by high temperature annealing caused a strong electron leakage, reducing device efficiency. DC capacitance analysis revealed that ag-ZME has a highly dielectric behavior, allowing it to selectively inject electrons into the LUMO of the organic layer while preventing non-emissive direct reduction of holes. Calcium(II) methoxyethoxide (CME) was also employed as an EIL for comparison and showed nearly the same performance as ZME in iOLEDs, despite its strongly insulating properties. The 4s orbitals of Ca(II) and Zn(II) in ag-CME and ag-ZME are used to regulate the electron injection, these insights offer a new design strategy that uses amorphous dielectric metal-organic thin films as EILs, which may yield high-performance, flexible, and stable electronic devices, such as iOLEDs and perovskite solar cells.
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| Research Progress Status |
令和4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 |
令和4年度が最終年度であるため、記入しない。
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Report
(3 results)
Research Products
(23 results)
