立体化学的に活性な単体ペアと二次元多層亜鉛ペロブスキットの非線形光学特性
Xinyu Li1, Yan Guan1, Xiaotong Li2
1Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Journal of the American Chemical Society
|September 22, 2022
まとめ
この研究では,新しい2Dタンとジャーマンイオイドペロブスキットを調査し,独自の単対電子活動により,調整可能な半導体特性と,光電子のための無鉛の代替品としての可能性を明らかにしました.
科学分野:
- 材料科学
- 固体化学
- 光電子機器
背景:
- 二次元 (2D) メタルハリドペロブスキットは調節可能な半導体であり,以前の研究は鉛 (Pb) ベースのシステムに焦点を当てた.
- 多層のスチーン (Sn) とゲルマニウム (Ge) ベースの2Dペロブスキットは,異なる構造の化学的性質と2つの単対の電子からのユニークな性質の可能性があるにもかかわらず,未熟のままです.
研究 の 目的:
- 新しい2Dチンとゲルマニウムヨウド酸ペロブスキットを合成し,特徴づけること.
- 構造と性質の関係,特に単一対のステレオ化学的活動が結晶構造,半導体,非線形光学特性に及ぼす影響を調査する.
- これらの材料を,光電子アプリケーションの潜在的な無鉛の代替品として評価する.
主な方法:
- 2Dチンのヨド酸ペロブスキート (BA) 2と2Dゲルマニウムヨド酸ペロブスキート (BA) 2の合成,ここでBA = n-ブチラムニウムとA =様々な有機カチオン.
- 構造分析とPbベースの対照値との比較
- 半導体特性 (バンドギャップ,キャリアフォノン相互作用) と非線形光学特性 (第2ハーモニック生成,二フォトン吸収) の特徴付け.
主要な成果:
- 単一のペアの活動,結晶構造,および材料特性の間の相関関係を確立した.
- 単独のペアの活動が強化され,より顕著な低エネルギー光発光尾につながった.
- (BA) 2 (A) Ge2I7で,SnとPbの類型を大幅に上回る強力な第2ハーモニック生成 (∼10 pm V-1) を実証した.
- (BA) 2 (A) Sn2I7の報告された3次二光子吸収係数 (∼10cmMW-1) は,Pb同位体や従来の半導体よりも大きい.
結論:
- Lone-pair活動は,2Dハリドペロブスキットの組成と物理的特性を結びつける重要な要因である.
- 2Dタンとジェルマニウムヨウ酸化ペロブスキットは,有望な非線形光学特性を示しています.
- これらのSnとGeベースの2Dペロブスキットは,先進的な非線形光電子装置のための実行可能な無鉛の代替品を表しています.
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