混合钙钛矿的角分辨阴极荧光偏振法
Angle-Resolved Cathodoluminescence Polarimetry of Hybrid Perovskites
摘要：
光和物质之间的耦合强烈依赖于电磁场的偏振和材料中激发的性质。随着混合钙钛矿成为LED、激光器和光电探测器等光基技术的一种有前途的材料，了解光子如何与物质耦合的微观细节至关重要。虽然大多数光学研究都集中在各种混合钙钛矿薄膜和纳米级结构中发射光子的光谱含量和量子效率上，但很少有研究探索发射光子的其他性质，如偏振和发射角。在这里，我们使用角分辨阴极发光显微镜来访问从大晶粒混合钙钛矿薄膜发射的光子的全偏振态，其空间分辨率远低于光学衍射极限。映射的斯托克斯参数作为一个功能的发射角在薄膜，我们揭示了晶界上的偏振度和角度的光子发射的效果。这种探索的角度和偏振分辨发射附近的晶界提供了一个更好的理解的发射性能的混合钙钛矿在薄膜的几何形状-一个必要的调查，为后续工程的亚波长纳米光子结构使用的混合钙钛矿类材料。
英文摘要：
Coupling between light and matter strongly depends on the polarization of the electromagnetic field and the nature of the excitations in the material. As hybrid perovskites emerge as a promising class of materials for light-based technologies like LEDs, lasers, and photodetectors, understanding the microscopic details of how photons couple to matter is critical. While most optical studies have focused on the spectral content and quantum efficiency of emitted photons in various hybrid perovskite thin-film and nanoscale structures, few studies have explored other properties of the emitted photons such as polarization and emission angle. Here, we use angle-resolved cathodoluminescence microscopy to access the full polarization state of photons emitted from large-grain hybrid perovskite films with spatial resolution well below the optical diffraction limit. Mapping the Stokes parameters as a function of the emission angle in a thin film, we reveal the effect of a grain boundary on the degree of polarization and angle at which the photons are emitted. This exploration of angle- and polarization-resolved emission near grain boundaries provides an improved understanding of the emission properties of hybrid perovskites in thin film geometries -- a necessary investigation for subsequent engineering of subwavelength nanophotonic structures using the hybrid perovskite class of materials.
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