论文标题
量子井限制和竞争性辐射途径在黑磷层的发光中
Quantum well confinement and competitive radiative pathways in the luminescence of black phosphorus layers
论文作者
论文摘要
黑色磷（BP）以其他2D材料脱颖而出，从带隙能量（Delta（Eg））的宽幅度从可见的（VIS）到红外（IR）波长，取决于层厚度，从而将光学窗口从可见的（VIS）到红外（IR）波长。这种奇异性使BP的光学和激子特性难以映射。具体而言，文献缺乏在扩展厚度范围内提供有关BP光学特性的实验和理论数据。在这里，我们报告了通过机械去角质获得的厚度为4 k至700 nm的厚度为4 k至700 nm的厚度为4 k的79个钝化BP片的光致发光光谱的研究。我们观察到，去角质步骤引起的其他缺陷指出，从晶体中观察到的结合激子的辐射重组竞争。我们还表明，光致发光能量与厚度的演变遵循了一个量子井的限制模型，可以从预测的厚度和25 nm处进行探测。放置在不同2D异质结构中的BP平板表明，介电环境并未显着调节发射能。简介监禁效应
Black phosphorus (BP) stands out from other 2D materials by the wide amplitude of the band-gap energy (Delta(Eg)) that sweeps an optical window from Visible (VIS) to Infrared (IR) wavelengths, depending on the layer thickness. This singularity made the optical and excitonic properties of BP difficult to map. Specifically, the literature lacks in presenting experimental and theoretical data on the optical properties of BP on an extended thickness range. Here we report the study of an ensemble of photoluminescence spectra from 79 passivated BP flakes recorded at 4 K with thicknesses ranging from 4 nm to 700 nm, obtained by mechanical exfoliation. We observe that the exfoliation steps induce additional defects states that compete the radiative recombination from bound excitons observed in the crystal. We also show that the evolution of the photoluminescence energy versus thickness follows a quantum well confinement model appreciable from a thickness predicted and probed at 25 nm. The BP slabs placed in different 2D heterostructures show that the emission energy is not significantly modulated by the dielectric environment. Introduction Confinement effects
