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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Engineered Directional Charge Flow in Mixed Two-Dimensional Perovskites Enabled by Facile Cation-Exchange
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Engineered Directional Charge Flow in Mixed Two-Dimensional Perovskites Enabled by Facile Cation-Exchange

机译：通过Facile阳离子交换使能混合二维Perovskites中的工程方向电荷流动

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摘要

Two-dimensional (2D) organolead halide perovskites are promising candidates for many optoelectronic applications in view of their improved moisture-resistance and tunability in bandgap energy as compared to their 3D counterparts. Herein, we demonstrate the use of cation exchange between A and B in (A)(2)(B)(n-1)PbnI3n+1 (A = CH3(CH2)(3)NH3+, B = CH3NH3+) to fabricate mixed 2D perovskites with well-controlled n-values of perovskite constituentsas well as their relative amounts. We find that the perovskite components in thin films can be systematically tuned from pure 3D to 2D mixture (containing multiple 2D components), and to pure single-phase 2D (n = 1) by simply adjusting the cation-exchange time. Extensive static and transient spectroscopic measurements show the internal electron-hole separation in the mixed 2D perovskite film clue to the ordered band alignment between different perovskite components. This engineered directional charge flow can be particularly helpful for the photovoltaic application of 2D perovskites.
机译：考虑到其与其3D对应物相比，其具有许多光电应用的许多光电应用的候选者是许多光电应用的承诺候选者。在此，我们证明在（a）（2）（b）（b）（b）（n-1）pbni3n + 1（a = ch 3（ch 2）（3）NH 3 +，B = CH 3 NH 3 +）中使用阳离子交换（a = CH 3（3）NH 3 +，B = CH 3 NH 3 +）以制造混合2D Perovskites具有良好控制的钙钛矿成分的N值，以及它们的相对量。我们发现薄膜中的钙钛矿组件可以通过简单地调节阳离子交换时间来系统地从纯3D到2D混合物（含有多相组分）和纯单相2d（n = 1）。广泛的静态和瞬态光谱测量显示混合的2D钙钛矿膜线索中的内部电子空穴分离到不同钙钛矿组分之间的有序带对准。该工程化方向电荷流动对2D Perovskites的光伏应用特别有利。

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