Spatial Charge Separation as the Origin of Anomalous Stark Effect in Fluorous 2D Hybrid Perovskites

Queloz Valentin I. E.; Bouduban Marine E. F.; Garcia-Benito Ines; Fedorovskiy Alexander; Orlandi Simonetta; Cavazzini Marco; Pozzi Gianluca; Trivedi Harsh; Lupascu Doru C.; Beljonne David; Moser Jaques-E; Nazeeruddin Mohammad Khaja; Quarti Claudio; Grancini Giulia

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Spatial Charge Separation as the Origin of Anomalous Stark Effect in Fluorous 2D Hybrid Perovskites

机译：空间电荷分离为流荧光2D杂交植物中异常缺斑效应的起源

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2D hybrid perovskites (2DP) are versatile materials, whose electronic and optical properties can be tuned through the nature of the organic cations (even when those are seemingly electronically inert). Here, it is demonstrated that fluorination of the organic ligands yields glassy 2DP materials featuring long-lived correlated electron-hole pairs. Such states have a marked charge-transfer character, as revealed by the persistent Stark effect in the form of a second derivative in electroabsorption. Modeling shows that electrostatic effects associated with fluorination, combined with the steric hindrance due to the bulky side groups, drive the formation of spatially dislocated charge pairs with reduced recombination rates. This work enriches and broadens the current knowledge of the photophysics of 2DP, which will hopefully guide synthesis efforts toward novel materials with improved functionalities.

机译：2D Hybrid Perovskites（2DP）是多功能材料，其电子和光学性能可以通过有机阳离子的性质调整（即使这些似乎是电子方式惰性的）。这里，证明有机配体的氟化产生玻璃2DP材料，具有长寿命相关的电子孔对。这些状态具有标记的电荷转移特征，如持续的滞留效果以第二衍生物在电吸收中的形式所揭示的。建模表明，与氟化件相关的静电效应与由于庞大的侧基引起的空间障碍相结合，使空间脱位的电荷对形成具有降低的重组率。这项工作丰富并扩大了2DP的光物理学的目前的知识，希望引导综合努力改善功能的新材料。

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来源
《Advanced Functional Materials》 |2020年第28期|2000228.1-2000228.8|共8页
作者
Queloz Valentin I. E.; Bouduban Marine E. F.; Garcia-Benito Ines; Fedorovskiy Alexander; Orlandi Simonetta; Cavazzini Marco; Pozzi Gianluca; Trivedi Harsh; Lupascu Doru C.; Beljonne David; Moser Jaques-E; Nazeeruddin Mohammad Khaja; Quarti Claudio; Grancini Giulia;
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Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Grp Mol Engn Funct Mat CH-1951 Sion Switzerland;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Photochem Dynam Grp CH-1015 Lausanne Switzerland|Ecole Polytech Fed Lausanne Lausanne Ctr Ultrafast Sci LACUS CH-1015 Lausanne Switzerland;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Grp Mol Engn Funct Mat CH-1951 Sion Switzerland;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Grp Mol Engn Funct Mat CH-1951 Sion Switzerland;

CNR Ist Sci & Tecnol Chim Giulio Natta CNR SCITEC Via Golgi 19 I-20133 Milan Italy;

CNR Ist Sci & Tecnol Chim Giulio Natta CNR SCITEC Via Golgi 19 I-20133 Milan Italy;

CNR Ist Sci & Tecnol Chim Giulio Natta CNR SCITEC Via Golgi 19 I-20133 Milan Italy;

Univ Duisburg Essen Inst Mat Sci D-45141 Essen Germany|Univ Duisburg Essen Ctr Nanointegrat Duisburg Essen CENIDE D-45141 Essen Germany;

Univ Duisburg Essen Inst Mat Sci D-45141 Essen Germany|Univ Duisburg Essen Ctr Nanointegrat Duisburg Essen CENIDE D-45141 Essen Germany;

Univ Mons Lab Chem Novel Mat Pl Parc 20 B-7000 Mons Belgium;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Photochem Dynam Grp CH-1015 Lausanne Switzerland|Ecole Polytech Fed Lausanne Lausanne Ctr Ultrafast Sci LACUS CH-1015 Lausanne Switzerland;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Grp Mol Engn Funct Mat CH-1951 Sion Switzerland;

Univ Mons Lab Chem Novel Mat Pl Parc 20 B-7000 Mons Belgium|Univ Rennes Inst Sci Chim Rennes ISCR ENSCR INSA Rennes CNRS F-35000 Rennes France;

Ecole Polytech Fed Lausanne Inst Chem Sci & Engn Grp Mol Engn Funct Mat CH-1951 Sion Switzerland|Univ Pavia Dept Chem Via Taramelli 14 I-27100 Pavia Italy|Univ Pavia INSTM Via Taramelli 14 I-27100 Pavia Italy;

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正文语种 eng
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关键词
2D perovskite; electroabsorption; Stark effect; transient absorption;

机译：2D Perovskite;电吸收;缺点效果;瞬态吸收;

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Spatial Charge Separation as the Origin of Anomalous Stark Effect in Fluorous 2D Hybrid Perovskites

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