Optical properties of super-widegap semiconductors studied by time and spatially resolved deep-ultraviolet spectroscopy

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H04810
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Crystal engineering
• Research Institution: Kyoto University
• Principal Investigator: Ishii Ryota 京都大学, 工学研究科, 助教 (60737047)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 深紫外分光 / 近接場分光 / 励起子 / ダイヤモンド / 窒化物半導体 / 時間分解分光 / ワイドギャップ半導体

Outline of Final Research Achievements

The purpose of this study is to explore time and spatially resolved resolved deep ultraviolet spectroscopy and to reveal the optical properties of ultra-wide bandgap semiconductors. In the former, we developed a deep-ultraviolet scanning near-field optical microscope which has the shortest excitation wavelength ever reported. In the latter, we revealed the isotopic effect on excitons in diamond using deep-ultraviolet photoluminescence spectroscopy. We observed a deep-ultraviolet emission from nano-polycrystalline diamond. We observed localized emissions from AlGaN quantum well structures using a deep-ultraviolet scanning near-field optical microscope.

Free Research Field

半導体光物性

Academic Significance and Societal Importance of the Research Achievements

空気中を漂うウイルス(例えばコロナウイルスやインフルエンザウイルス)の滅菌に深紫外光の照射が有効であることがわかっている．しかしながら，現行の深紫外光源の発光効率は低く，深紫外光源の材料となる超ワイドギャップ半導体の光物性解明が望まれている．そこで本研究は，高効率深紫外発光光源の実現を目指して，未成熟である深紫外分光技術の深化とそれによる超ワイドギャップ半導体の光物性解明に取り組んだ．