Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.
Int J Mol Sci. 2022 Oct 19;23(20):12531. doi: 10.3390/ijms232012531.
In this work, the current state of research concerning the determination of the effective mass in 2D layered perovskites is presented. The available experimental reports in which the reduced effective mass μ has been directly measured using magneto-absorption spectroscopy of interband Landau levels are reviewed. By comparing these results with DFT computational studies and various other methods, it is concluded that depending on the approach used, the μ found spans a broad range of values from as low as 0.05 up to 0.3 me. To facilitate quick and reliable estimation of μ, a model is proposed based solely on the available experimental data that bypass the complexity of interband Landau level spectroscopy. The model takes advantage of the μ value measured for (PEA)2PbI4 and approximates the reduced effective mass of the given 2D layered perovskites based on only two experimental parameters-the diamagnetic coefficient and the effective dielectric constant. The proposed model is tested on a broad range of 2D layered perovskites and captures well the main experimental and theoretical trends.
在这项工作中，呈现了关于二维层状钙钛矿中有效质量确定的研究现状。综述了利用带间朗道能级的磁吸收光谱直接测量得到的有效质量μ的现有实验报告。通过将这些结果与密度泛函理论（DFT）计算研究和各种其他方法进行比较，可以得出结论，根据所采用的方法，所得到的μ值范围很广，从低至 0.05 到 0.3 me。为了便于快速可靠地估计μ，提出了一个仅基于现有实验数据的模型，该模型绕过了带间朗道能级光谱的复杂性。该模型利用（PEA）2PbI4 测量的μ值，并仅基于两个实验参数——抗磁系数和有效介电常数，来近似给定二维层状钙钛矿的有效质量。该模型在广泛的二维层状钙钛矿上进行了测试，很好地捕捉了主要的实验和理论趋势。
