緑色光を発する半導体の材料設計:ペロブスキート型硫化物 SrHfS3
Kota Hanzawa1, Soshi Iimura1, Hidenori Hiramatsu1,2
1Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , Mailbox R3-3, 4259 Nagatsuta-cho, Midori-ku , Yokohama 226-8503 , Japan.
Journal of the American Chemical Society
|March 7, 2019
まとめ
研究者らは,デバイスで効率的な緑色の光放出のための有望な半導体材料であるストロンチウムハフニウムトリシルフィード (SrHfS3) を特定しました. この材料は調節可能な伝導性とキャリアポラリティを提供し,光電子学の重要な課題に取り組んでいます.
科学分野:
- 材料科学
- 固体物理学
- 光電子機器
背景:
- 先進的な発光装置には 効率的なグリーン・エミッティング・マテリアルの開発が不可欠です
- 現存する材料には,安定して効率的な緑色の光の放出に必要な性質が欠けていることが多い.
研究 の 目的:
- 初期の移行金属 (eTM) ベースのペロブスキットを緑色光放射のために探求する.
- 光電子アプリケーションのための特定の電子帯構造と制御可能な特性を有する半導体を特定する.
主な方法:
- 深導帯域最小値 (CBM) と浅導帯域最大値 (VBM) に対して調査されたeTMペロブスキット.
- 緑色放出のための直接的な帯域のギャップを達成するために,帯域の折り畳み技術を採用した.
- (La) と (P) でオーソロンビックSrHfS3を合成してドーピングし,伝導性とキャリアの極性調節する.
主要な成果:
- SrHfS3で調節可能な電気伝導性は6 × 10−7から7 × 10−1 S·cm−1 (Laドーピング) と2 × 10−4 S·cm−1 (Pドーピング) に達した.
- Laドーピングによるn型とP型へのキャリアポラリティの制御に成功しました.
- 2.37 eVの強烈な緑色光発光 (PL) が,ドーピングされていないSrHfS3とドーピングされたSrHfS3の両方で観測され,帯から帯への移行またはエキストンに起因する.
結論:
- ストロンチウムハフニウム三硫化物 (SrHfS3) は,緑色光を発するアプリケーションの非常に効果的な半導体としての可能性を証明しています.
- この材料の調節可能な電子特性と強い緑色放射は,光電子学の現在の限界を克服するための有効な候補となります.
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