Exciton-band tuning induced by the width of the cation in 2D lead iodide perovskite hybrids,Materials Chemistry Frontiers

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Exciton-band tuning induced by the width of the cation in 2D lead iodide perovskite hybrids
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-05-29 , DOI: 10.1039/d0qm00118j
Marie-Hélène Tremblay _{1,

2,

3,

4} , John Bacsa _{1,

2,

3,

4,

5} , Stephen Barlow _{1,

2,

3,

4} , Seth R. Marder _{1,

2,

3,

4}

Affiliation

It was previously demonstrated that the exciton energy of 2D hybrid organic–inorganic A₂PbI₄ perovskites is correlated with the Pb–I–Pb bond angle of the inorganic layer. We demonstrate that this angle can be tuned by changing the width of the cation and that the exciton band energy can be varied over ca. 100 meV, at least within a limited series of A₂PbI₄ compounds where A is a 2-(3,5-disubstitutedphenyl)ethylammonium or 2-(3-substitutedphenyl)ethylammonium ion and where the substituents are H, F, Cl, Br, or Me. Seven new crystal structures are presented here.

中文翻译：

2D碘化铅钙钛矿杂化体中阳离子宽度引起的激子带调谐

先前已证明，二维杂化有机-无机A ₂ PbI ₄钙钛矿的激子能量与无机层的Pb–I–Pb键角相关。我们证明，可以通过改变阳离子的宽度来调节该角度，并且激子带能可以在大约范围内变化。100 meV，至少在有限的一系列A ₂ PbI ₄化合物内，其中A为2-（3,5-二取代苯基）乙基铵或2-（3-取代苯基）乙基铵离子，且取代基为H，F，Cl， Br，或我。这里介绍了七个新的晶体结构。

更新日期：2020-07-02

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