Photoinduced physical-properties switching of photochromic rare-earth metal oxyhydrides thin films
| Project/Area Number |
19H02596
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 29020:Thin film/surface and interfacial physical properties-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Shimizu Ryota 東京工業大学, 物質理工学院, 准教授 (70611953)
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| Co-Investigator(Kenkyū-buntansha) |
関場 大一郎 筑波大学, 数理物質系, 講師 (20396807)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
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| Keywords | 薄膜物性 / 複合アニオン化合物 / 光物性 / 電子物性 / 電気化学 / 金属水素化物 / エピタキシャル成長 / 光・電子物性 / 水素化物薄膜物性 / 光誘起物性 |
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| Outline of Research at the Start |
イットリウム酸水素化物薄膜において光照射による可逆的な5桁の抵抗変化を見出し、新奇光センサや抵抗・磁気メモリの応用を目指している。次なるステップとして、本研究では希土類酸水素化物における多機能なフォトクロミック素子応用を志向し、「光キャリア生成機構と磁気特性の解明」、「可逆的な透過・反射特性および金属化」「強磁性化」の実現を目指す。
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| Outline of Final Research Achievements |
In this study, we demonstrated repeatable photoinduced insulator-to-metal transition of rare-earth metal oxyhydrides using ultraviolet laser illumination for the first time. This permanent photoconductivity can be switched to the original insulating states by thermal annealing in argon atmosphere at 120oC for 2h. To investigate this photoinduced metallization, we performed high-resolution measurements including compositional and structural analysis based on sparse modeling technique, and obtained reliable structural models for theoretical calculations. The theoretical calculations reveals that excess hydrogen in the films can generate itinerant photocarriers, leading to metallic conduction. Thus, we succeeded in the exotic functions based on hydrogen in rare-earth metal oxyhydrides.
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| Academic Significance and Societal Importance of the Research Achievements |
光による絶縁体から金属へのスイッチングを繰り返し行った例は、どの物質においても世界で初めての成果である(プレスリリース済み)。未発表ではあるが、任意のタイミングにおける絶縁化の時間短縮にも成功しており、スマートウィンドウや光センサ・光メモリ応用につながる画期的な成果である。
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Report
(4 results)
Research Products
(27 results)
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[Journal Article] Repeatable Photoinduced Insulator-to-Metal Transition in Yttrium Oxyhydride Epitaxial Thin Films2022
Author(s)
Y. Komatsu, Ryota Shimizu, R. Sato, M. Wilde, K. Nishio, T. Katase, D. Matsumura, H. Saitoh, M. Miyauchi, J. R. Adelman, R. M. L. McFadden, D. Fujimoto, J. O. Ticknor, M. Stachura, I. McKenzie, G. D. Morris, W. A. MacFarlane, J. Sugiyama, K. Fukutani, S. Tsuneyuki, T. Hitosugi
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Journal Title
Chemistry of Materials
Volume: 34
Issue: 8
Pages: 3616-3623
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Bayesian sparse modeling of extended X-ray absorption fine structure to determine interstitial oxygen positions in yttrium oxyhydride epitaxial thin film2021
Author(s)
Hiroyuki Kumazoe, Yasuhiko Igarashi, Fabio Iesari, Ryota Shimizu, Yuya Komatsu, Taro Hitosugi, Daiju Matsumura, Hiroyuki Saitoh, Kazunori Iwamitsu, Toshihiro Okajima, Yoshiki Seno, Masato Okada, Ichiro Akai
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Journal Title
AIP Advances
Volume: 11
Issue: 12
Pages: 125013-125013
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] Photo-induced hydrogen diffusion in yttrium oxy-hydride epitaxial thin films2021
Author(s)
Yuya Komatsu, Jun Sugiyama, Ryota Shimizu, Kazunori Nishio, Masahiro Miyauchi, Markus Wilde, Katsuyuki Fukutani, Ryan McFadden, Martin Dehn, Victoria Karner, Derek Fujimoto, John Ticknor, Aris Chatzichristos, Monika Stachura, David Cortie, Gerald Morris, Dr. Iain McKenzie, W MacFarlane, Taro Hitosugi
Organizer
Pacifichem2021
Related Report
Int'l Joint Research
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