ホモゲナイズドハリドとアルカリケーション分離は,合金化された有機-無機ペロブスキット
Juan-Pablo Correa-Baena1,2, Yanqi Luo3,4, Thomas M Brenner3,4
1Massachusetts Institute of Technology, Cambridge, MA 02139, USA. jpcorrea@gatech.edu buonassisi@mit.edu dfenning@eng.ucsd.edu.
Science (New York, N.Y.)
|February 9, 2019
まとめ
ハリドペロブスキート太陽電池のアルカリ金属カチオンは,ハリド分布を均一化し,性能を改善します. しかし,高濃度では有害な相分離と再結合活性クラスターが発生し,デバイスの効率に影響を与えます.
科学分野:
- 材料科学
- 再生可能エネルギー
- 固体化学
背景:
- ハリドペロブスキート太陽電池におけるアルカリ金属カチオンの正確な役割は不明である.
- これらの役割を理解することは,ペロブスキットの光伏性能を最適化するために不可欠です.
研究 の 目的:
- アルカリ金属 (セシウム,ルビジウム,カリウム) のハライド分布と光電特性への影響を調査する.
- ペロブスキート太陽電池の性能に対するアルカリ金属の影響のメカニズムを解明する.
主な方法:
- シンクロトロンベースのナノX線光顕微鏡
- 補完的なスペクトル測定と顕微鏡測定
- ペロブスキート太陽電池装置の製造と特徴付け
主要な成果:
- イオジウム添加は,単独またはルビジアムイオジウムで,様々な組成物のハライド分布を均質化する.
- ホモゲナイゼーションは,より長い電荷キャリア寿命と空間的に均一なキャリアダイナミクスと相関しています.
- ルビジアムとカリウムイオンは,より高い濃度で相分離したクラスターを形成する傾向があります.
- ホモゲナイズドハライド分布により,光伏装置の性能が改善されたことが観察された.
結論:
- アルカリ金属は低濃度では,ハライドの均質化を促進し,太陽電池の効率を高めます.
- より高い濃度では,アルカリ金属は再結合活性クラスターを形成し,デバイスの性能に悪影響を及ぼします.
- 塩基金属濃度の正確な制御はペロブスキート太陽電池の性能を最大化するために不可欠です.
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