ハリドペロブスキートから発光を最大化し安定させ,カリウム受動化

Mojtaba Abdi-Jalebi¹, Zahra Andaji-Garmaroudi¹, Stefania Cacovich²

¹Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.

Nature

|March 23, 2018

まとめ

研究者はカリウムハライド層を加えることで金属ハライドペロブスキットを改良した. 効率的な太陽電池や光電子装置の道を開くことでエネルギー損失を軽減し安定性を向上させます

科学分野:

材料科学
光電子機器
固体物理学

背景:

メタルハリドペロブスキットは,光電子機器のための調整可能なバンドギャップを提供します.
現在のペロブスキットは非放射性損失とイオン移動により性能が低下しています.
混合ハリドペロブスキートは,光誘導によるイオン分離により不安定である.

研究の目的:

金属ハリドペロブスキットの非放射性損失とイオン移動を軽減する.
ペロブスキットベースの光電子装置の性能と安定性を向上させる.
高い発光率と充電輸送を同時に達成する.

主な方法:

カリウムハライド層を用いた表面と粒子の境界の受動化.
光発光量子収量と電荷载体移動性の特徴化
ペロブスキート太陽電池装置の製造と試験

主要な成果:

外部光発光量66% (内部>95%) を達成した.
高い電荷キャリアの移動率 (> 40 cm2/Vs) を維持した.
光誘発性イオン移動の抑制と安定したバンドギャップ.

結論:

カリウムハリドの受動化は,金属ハリドペロブスキットの損失を効果的に削減し,安定性を改善します.
開発された材料は,タンデム太陽電池とLEDの効率の限界に近づいています.
この研究は,次世代の光電子機器のための調整可能なペロブスキートフィルムを進歩させています.

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