| Project/Area Number |
18K18855
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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 21:Electrical and electronic engineering and related fields
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2018-06-29 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
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| Keywords | 誘電体 / 光誘起効果 / 光電効果 / アルミネート / 光誘起現象 / 誘電体物性 / ワイドギャップ酸化物 |
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| Outline of Final Research Achievements |
We have explored novel dielectric materials with the photo-dielectric effect, the dielectric permittivity of which varies with photo-irradiation, and have studied a mechanism of the photo-tunability. Through extensive investigations, we have found considerable enhancement of permittivity in reduced LaAlO3 under the photo-irradiation, and have clarified that oxygen vacancies play an important role in the observed photo-dielectric effect. In the modified BaAl2O4, which was subjected to slight element-substitution, furthermore, we have found that the dielectric relaxation of the photo-dielectric effect around 107 Hz. By analyzing the observed dielectric relaxation, it has been clarified that the photo-dielectric effect stems from the polarization response of photo-excited carriers trapped at the multiple in-gap states.
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| Academic Significance and Societal Importance of the Research Achievements |
トランジスタや青色LEDに代表されるように、新しいデバイス素子の創出は科学技術の新展開を常に先導してきた。本研究は、光－誘電応答相関の基礎学理構築を通して、光によって誘電体の特性を自在にコントロールする、これまでに例の無い全く新しいデバイス素子の創製に取り組むものである。誘電体は、周波数フィルタやセンサなどへの応用を通して現代の電子デバイスに遍く応用されており、言うなれば「エレクトロニクス技術の米」とも言うべき物質系である。したがって、本研究で実現する誘電体の光制御は、従来のエレクトロニクスから次世代のフォトエレクトロニクスへの不連続な技術革新を先導すると期待される。
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