The effective mass of charge carriers is a crucial parameter for the design of any optoelectronic device. The estimated values of the effective mass of 2D halide perovskites currently span a broad range, providing an unwelcome source of confusion in this promising material system. Here we highlight how the distortion imposed by the organic spacers, and orbital hybridization effects by the metal cation, govern the effective mass. As a result, the effective mass in 2D halide perovskites can be easily tailored over a wide range. To demonstrate this, we have directly measured the reduced effective mass of charge carriers in phenethylamine (PEA)-based 2D halide perovskites. Combining the experimental results with electronic band-structure calculations, we propose a scaling diagram for the effective mass value versus the distortion of the octahedra imposed by the organic cations.

中文翻译：

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二维卤化物钙钛矿中载流子有效质量的广泛可调性

载流子的有效质量是任何光电设备设计的关键参数。目前二维卤化物钙钛矿有效质量的估计值范围很广，在这种有前途的材料系统中提供了令人不快的混乱来源。在这里，我们重点介绍了有机间隔基所施加的畸变以及金属阳离子的轨道杂化效应如何影响有效质量。结果，可以轻松地在较大范围内定制2D卤化物钙钛矿的有效质量。为了证明这一点，我们直接测量了基于苯乙胺（PEA）的2D卤化物钙钛矿中有效的载流子质量降低。将实验结果与电子能带结构计算相结合，