Angle-resolved cathodoluminescence polarimetry of hybrid organic-inorganic lead halide perovskites*

Hybrid organic-inorganic lead halide perovskites have garnered a great deal of interest for cutting edge opto-electronics and it is crucial to understand how microstructure modifies light emission processes. While much work is focused on the spectral content and the quantum efficiencies, little is known about the emission directionality and the polarization of the emitted photons. Here we use angle-resolved cathodoluminescence microscopy, having spatial resolution well below the optical diffraction limit, to probe the directionality and full polarization state of emitted photons. Furthermore, we investigated the impact of a boundary on the degree of polarization and emission directionality.