高効率の太陽光発電のためのセシウム鉛ハリドペロブスキート量子ドットに関する標的型リガンド交換化学
Lance M Wheeler1, Erin M Sanehira1,2, Ashley R Marshall1,3
1National Renewable Energy Laboratory , Golden , Colorado 80401 , United States.
Journal of the American Chemical Society
|July 26, 2018
まとめ
メタルハリドペロブスキート量子ドット (MHP QD) の表面操作は,高効率の太陽電池にとって困難ですが,非常に重要です. この研究は,特定のリガンド交換と大気中の水分が制御されたMHP QD膜形成をどのように可能にし,光伏の性能を向上させるかを明らかにしています.
科学分野:
- 材料科学
- ナノテクノロジー
- 太陽光発電
背景:
- メタルハリドペロブスキート量子ドット (MHP QD) の表面操作は,そのダイナミックな表面化学と低い形成エネルギーのために困難です.
- 従来の方法はしばしばMHP QDの結晶の分解につながります.
- 以前の研究では,QDのサイズと光電子特性を維持したリガンド交換を使用して高効率のQD太陽電池 (QDSC) を達成しました.
研究 の 目的:
- 膜の沈殿過程におけるMHP QD表面の化学的性質を分子レベルで理解する.
- MHP QDの表面改変におけるアニオンおよびカチオンリガンドの役割を解明する.
- 高品質で電子的に結合されたMHP QDフィルムのためのリガンド交換手順を最適化します.
主な方法:
- MHP QDの表面化学を分析するために様々なスペクトロスコピック技術を使用した.
- オレアート (アニオン) とオレーラモニウム (カチオン) のリガンドの交換を調査した.
- リガンド交換と膜形成に対する大気中の水分と処理時間の影響を研究した.
主要な成果:
- 大気中の水分は,油酸リガンドの代用となるエセティック酸の生成を促進する.
- 原生オレイラモニウムリガンドは,最終的なフォーマミディニウム処理まで保持されます.
- 大量MHP変換なしに結合されたQDフィルムを得るために,フォーマミディニウム処理の狭い処理ウィンドウは不可欠です.
結論:
- この研究は,高品質のMHP QDフィルムの堆積に関する重要な化学的洞察を提供します.
- 制御されたリガンド交換と処理条件は,量子閉じ込めと結晶相を維持します.
- 最適化されたMHP QDフィルムは,QDSCで高い光伏性能を達成します.
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