クリーングラフェン/CH3NH3PbI3インターフェースからの超高速ブロードバンド充電収集
Hao Hong1, Jincan Zhang2, Jin Zhang3
1State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Centre of Quantum Matter, School of Physics , Peking University , Beijing 100871 , China.
Journal of the American Chemical Society
|October 25, 2018
まとめ
研究者はクリーンなグラフェン/ペロブスキットインターフェースを使用して超高速のブロードバンドチャージ収集を達成しました. 光電子技術におけるこの突破は,光伏装置の電流とエネルギー変換の効率を高めることを約束しています.
科学分野:
- 材料科学
- 光電子機器
- 太陽光発電
背景:
- 光電子装置や光伏装置では 効率的な電荷収集が不可欠です
- 超高速とブロードバンドのチャージ収集は,電流とエネルギー変換の効率を向上させるための鍵です.
研究 の 目的:
- クリーンなグラフェン/ペロフスキットインターフェイスで超高速とブロードバンドの同時充電を実証する.
- この新しいインターフェースでの 充電の集積のダイナミクスを調べるため
主な方法:
- グラフェンにペロブスキットの直接成長は,クリーンなインターフェースを確保します.
- 調節可能な2色ポンプ探査スペクトル.
- 時間の解像度を持つ光発光スペクトロスコーピー
- 時間依存密度関数理論の計算
主要な成果:
- バンドエッジフォトキャリアの超高速 (∼100 fs) ブロードバンドチャージ収集を達成した.
- ユニットに近い電流の収集効率が実証されている (∼99%).
- グラフェンは,ペロブスキットの固有の冷却速度を超えて,約50fsで熱したキャリアを抽出しました.
- グラフェンのユニークなディラック線形帯構造を強調し,高効率なホットキャリア抽出を行います.
結論:
- クリーンなグラフェン/ペロブスキットインターフェースにより,超高速とブロードバンドの同時チャージ収集が可能になります.
- グラフェンは,その性質とディラック帯構造により,理想的な電荷収集層として機能します.
- このアプローチは,高効率の光電子装置と光伏装置の可能性を提供し,おそらくショックリー-クエッサーの限界を超えます.
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