低次元ペロブスキート光学における量子井戸幅分布とキャリア移動の合成制御
Andrew H Proppe1,2, Rafael Quintero-Bermudez2, Hairen Tan2
1Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario, Canada , M5S 3G4.
Journal of the American Chemical Society
|February 6, 2018
まとめ
アリラモニウムリガンドは,量子井戸分布を狭めることで,低次元ペロブスキート太陽電池の安定性と性能を改善します. これにより,電荷キャリアの拡散が強化され,電力変換効率 (PCE) が向上します.
科学分野:
- 材料科学
- 太陽光発電
- ナノテクノロジー
背景:
- 金属ハリドペロブスキットは高光発電効率を提供していますが,不安定です.
- 有機結合体を持つ低次元ペロブスキットは,量子井戸 (QWs) を形成することによって安定性を高めます.
- 薄膜のQW幅分布はバンドギャップの変動を引き起こし,パフォーマンスを制限する.
研究 の 目的:
- 低次元ペロブスキットのQW幅分布を精密に制御する.
- QWの幅が太陽光発電の性能に及ぼす影響を調査する.
- ペロブスキート太陽電池の安定性と効率を高めるため
主な方法:
- QW幅の分布を狭めるためのリガンドとしてアルリラムニウムを使用する.
- アリラモニウムベースのペロブスキート量子井戸 (PQW) の太陽電池の製造
- 混合カチオン戦略を用いたPQW装置の最適化
- 環境条件下での装置の安定性を評価する.
主要な成果:
- アリラモニウムリガンドは,より狭いQW幅分布をもたらした.
- 電子と穴の拡散長さはそれぞれ1.4×と1.9×増加した.
- 電力変換効率 (PCE) は,他のリガンドの11~12%と比較して,アルリラムニウムで14.4%に増加した.
- 最適化された装置はPCEの16.5%を達成し,650時間後に90%の効率を維持した.
結論:
- PQWの太陽電池の安定性と性能を大幅に改善します.
- QWの分布が狭くなると,電荷輸送が強化され,PCEが増加します.
- これらの発見は,より安定した効率的なペロブスキート光伏の道を開きます.
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