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2020 Fiscal Year Final Research Report

Spatio-time-resolved cathodoluminescence studies on singularity crystals

Planned Research

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Project AreaMaterials Science and Advanced Elecronics created by singularity
Project/Area Number 16H06427
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionTohoku University

Principal Investigator

Chichibu Shigefusa  東北大学, 多元物質科学研究所, 教授 (80266907)

Co-Investigator(Kenkyū-buntansha) 小島 一信  東北大学, 多元物質科学研究所, 准教授 (30534250)
嶋 紘平  東北大学, 多元物質科学研究所, 助教 (40805173)
中須 大蔵  東北大学, 多元物質科学研究所, 助教 (40801254)
Project Period (FY) 2016-06-30 – 2021-03-31
Keywords時間空間同時分解分光 / フェムト秒電子銃 / 光物性 / 特異構造
Outline of Final Research Achievements

Singular structures containing imperfections and/or inhomogeneity form heterostructures with the bulk and the surface. In order to probe local luminescence dynamics in such singularities embedded in wide bandgap semiconductors (WBGSs), spatio-time-resolved cathodoluminescence (STRCL), which uses a femtosecond-laser-driven pulsed photoelectron gun instead of cw electron gun of spatially resolved cathodoluminescence (CL) equipped on scanning electron microscopy (SEM), is an attractive tool. In this work, technical advantages were offered on the spatial and temporal resolutions of our STRCL system, and then local luminescence dynamics in designed, self-formed, and accidentally formed WBGS singularity structures fabricated by other research groups within this academic area such as GaN, InGaN, AlInN, AlN, and BN were successfully characterized.

Free Research Field

半導体光物性

Academic Significance and Societal Importance of the Research Achievements

完全結晶や完全構造体では発現しない機能を呈する「特異構造」における局所キャリア緩和・発光機構を解明する技術を開発し実証できた事により、新奇光・電子デバイスの実現に有用な光物性研究が可能になった。具体的には、高純度やMgイオン注入されたGaN、InGaN量子殻、AlInN自然超格子、高温アニールされたスパッタAlN、六方晶BN等の時間空間同時分解カソードルミネッセンス計測によりそれら特異構造における物性的特徴を明らかにした。それらの材料はデバイス作製フェーズへと進展しており、工学・理学の両側面において貢献できたと考えられる。今後も、本研究で構築した装置を用いた光物性研究の成果が期待される。

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Published: 2022-01-27  

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