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Engineered Directional Charge Flow in Mixed Two-Dimensional Perovskites Enabled by Facile Cation-Exchange
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.jpcc.7b08535 Junhui Wang 1 , Jing Leng 1 , Junxue Liu 1 , Sheng He 1 , Yu Wang 1 , Kaifeng Wu 1 , Shengye Jin 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.jpcc.7b08535 Junhui Wang 1 , Jing Leng 1 , Junxue Liu 1 , Sheng He 1 , Yu Wang 1 , Kaifeng Wu 1 , Shengye Jin 1
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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−1PbnI3n+1 (A = CH3(CH2)3NH3+, 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 due 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.
中文翻译：
通过方便的阳离子交换实现二维混合钙钛矿中的工程定向电荷流
二维（2D）有机铅卤化物钙钛矿由于与3D同行相比具有更高的耐湿性和带隙能量的可调谐性，因此有望用于许多光电应用。在这里，我们证明了在（A）2（B）n -1 Pb n I 3 n +1（A = CH 3（CH 2）3 NH 3 +，B = CH 3 NH 3 +）来制造具有受控n的混合2D钙钛矿钙钛矿成分的相对值及其相对含量。我们发现，薄膜中的钙钛矿成分可以从纯3D到2D混合物（包含多个2D成分）以及纯单相2D（n = 1）进行系统地调整。只需调整阳离子交换时间即可。大量的静态和瞬态光谱测量结果表明，由于不同钙钛矿成分之间的有序能带对准，导致混合的2D钙钛矿膜内部存在电子-空穴分离。这种设计的定向电荷流对于2D钙钛矿的光伏应用特别有用。
更新日期：2017-09-21
中文翻译：
通过方便的阳离子交换实现二维混合钙钛矿中的工程定向电荷流
二维（2D）有机铅卤化物钙钛矿由于与3D同行相比具有更高的耐湿性和带隙能量的可调谐性，因此有望用于许多光电应用。在这里，我们证明了在（A）2（B）n -1 Pb n I 3 n +1（A = CH 3（CH 2）3 NH 3 +，B = CH 3 NH 3 +）来制造具有受控n的混合2D钙钛矿钙钛矿成分的相对值及其相对含量。我们发现，薄膜中的钙钛矿成分可以从纯3D到2D混合物（包含多个2D成分）以及纯单相2D（n = 1）进行系统地调整。只需调整阳离子交换时间即可。大量的静态和瞬态光谱测量结果表明，由于不同钙钛矿成分之间的有序能带对准，导致混合的2D钙钛矿膜内部存在电子-空穴分离。这种设计的定向电荷流对于2D钙钛矿的光伏应用特别有用。
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