ダイヤモンドの pn 接点からの紫外線放射.
S Koizumi1, K Watanabe, M Hasegawa
1Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. KOIZUMI.satoshi@nims.go.jp
まとめ
研究者らは,ダイヤモンドの pn 接続を使用して紫外線発光ダイオードを開発しました. この装置は235ナノメートルで強い紫外線を放射し,これはダイヤモンド材料における自由エクシトンの再結合に起因する.
科学分野:
- マテリアルサイエンス 材料科学
- 固体物理 固体物理学
- オプトエレクトロニクス (光電子機器)
背景:
- ダイヤモンドは,その広いバンドギャップと熱伝導性のために,光電子機器のための有望な材料です.
- ダイヤモンドベースの発光ダイオード (LED) に関する以前の取り組みは,効率的な光放出を達成する上で課題に直面しています.
- ダイヤモンドの信頼性の高い pn 接続の開発は,LED 製造に不可欠です.
研究 の 目的:
- ダイヤモンドの pn 接続を利用した紫外線発光ダイオード (UV-LED) を実現する.
- ボロンとリンを添加したダイヤモンドの pn 結合の電気発光特性を調査する.
- 紫外線光を生成する放射機構を確認する.
主な方法:
- 単一結晶ダイヤモンド基板 (111面) 上でのボロンドーピングされたp型およびリンドーピングされたn型ダイヤモンド層のエピタキシアル成長.
- p型とn型のダイヤモンド層を統合することによって pn 接点の製造.
- ダイヤモンド pn 接続の電気的性質の特徴.
- 前向きバイアス条件下での電光スペクトルの測定.
主要な成果:
- 製造されたダイヤモンド pn 接続は,良いダイオード特性を示しました.
- 235ナノメートルの波長で,約20ボルトの前向きバイアス下で強い紫外線放射が観察されました.
- 観測された放射は,ダイヤモンド材料内の自由エクシトンの再結合に起因する.
結論:
- ダイヤモンドのpN接続をベースにしたUV-LEDの実現が成功したと報告されています.
- ダイヤモンド pn 接合は紫外線放射を生成するのに有効です.
- このダイヤモンドLEDにおける自由刺激子再結合は,UV放出の主なメカニズムとして特定され,先進的なUV光電子装置への道を開いている.
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