2022 Fiscal Year Final Research Report
Rashba effect and magneto-optical properties of halide perovskites
Project/Area Number |
19K03683
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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Research Institution | Chiba University |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2023-03-31
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Keywords | ハロゲン化金属ペロブスカイト |
Outline of Final Research Achievements |
In this study, we investigated the unique electrical and optical properties of lead halide perovskite semiconductors. Magnetic spectroscopy at cryogenic temperatures revealed the impact of the polaron formation on effective mass and exciton binding energy. The increase in effective mass due to the polaron effect was quantitatively estimated from the magnetic field dependence of the Landau levels. We also studied the opto-electric properties at ferroelastic domain boundaries. In the low-temperature orthorhombic phase, the optically forbidden triplet exciton splits into three. Furthermore, we obtained results suggesting the formation of a two-dimensional conductive region at this interface.
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Free Research Field |
半導体光物性
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Academic Significance and Societal Importance of the Research Achievements |
本研究では、太陽電池や光デバイス材料として脚光を浴びるハロゲン化金属ペロブスカイト半導体の基礎的な光学特性を明らかにした。特に、磁気分光によるポーラロン形成メカニズムの解明は、最も重要な半導体パラメータの一つである有効質量の正確な値を報告するとともに、この材料の電気伝導特性の高いポテンシャルを示した点で大きな意義がある。また、ドメイン境界における二次元伝導性は、今後のさらなる研究が必要であるが、同種界面を舞台にした新しい物理現象の発現との観点から興味深い。
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