2022 Fiscal Year Annual Research Report
Low Temperature Photochemical Sol-Gel Processing of Functional Thin Films and their Applications
| Project/Area Number |
20J40137
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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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| Keywords | flexible electronics / electron injection layer / zinc oxide / metal-organic / solution processing / dielectric material |
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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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Research Products
(10 results)
