効率的な水酸化のためのn型シリコン光電極の界面エネルギー操作
Tingting Yao, Ruotian Chen1, Junjie Li2
1University of Chinese Academy of Sciences , Beijing 100049, China.
Journal of the American Chemical Society
|September 23, 2016
まとめ
研究者は,インターフェイスのエネルギーレベルを操作することによって,太陽エネルギー変換のためのシリコン光電極を最適化しました. これは,電荷輸送と水の酸化効率を向上させ,記録的な低発生可能性を達成しました.
科学分野:
- 材料科学
- 電気化学
- 再生可能エネルギー
背景:
- ヘテロジャンクションフォトアノードは太陽エネルギー変換に不可欠ですが,インターフェイスのエネルギーレベルのために電荷分離と輸送に課題があります.
- n-Si/ITOフォトアノードでの不十分な電荷伝達は,しばしば望ましくないドナーのようなインターフェイスの欠陥によって引き起こされる.
研究 の 目的:
- n-Si ショットキー光アノドの界面エネルギーレベルを効率的に操作し,太陽エネルギー変換を改善します.
- フォトアノード装置における電荷分離と輸送を強化するための方法を調査する.
主な方法:
- n-Si/TiOx/ITO ショットキー結合を電子エネルギーレベルを処理してインターフェイスの欠陥を軽減した.
- 表面エネルギーレベルを NiOOH コーティングした ITO 層で変えて穴の抽出を容易にした.
- 表面光電圧測定と水酸化反応分析によって評価された光電極性能.
主要な成果:
- n-Si/TiOx/ITO結合は,電荷輸送を最適化して,0.95 eVのバリア高を達成した.
- 表面の光電圧はNiOOH層を組み込んだ後に115%増加した.
- 0. 9V (対 RHE) の空前の低発生電位を水酸化のために達成した.
結論:
- 光電化学的変換を進めるには,インターフェイスエネルギーの効率的な操作が不可欠です.
- 開発されたn-Si/TiOx/ITO/NiOOHフォトアノードは,水酸化のための高い電荷分離 (100%) と注入効率 (> 90%) を示しています.
- この研究は,太陽エネルギーアプリケーションのための高性能のシリコンベースのフォトアノードの設計のための経路を提供します.
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