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The MAPbI$_3$ halide perovskite single crystals are studied at 5 Ktemperature using the photoluminescence excitation spectroscopy. Twonon-interacting types of states are determined: bound excitons anddefect-related states. Excitation of the crystal with light energy below thebound exciton resonance reveals the complex low-density defects emission,otherwise hidden by the emission of bound excitons. A way to separate thesedefect-related luminescence spectra is proposed, and the thorough study of thisemission regime is carried out. The results of this study opens an area oflow-density defects and dopants exploration in halide perovskitesemiconductors.

Defect-related states in MAPbI$_3$ halide perovskite single crystals revealed by the photoluminescence excitation spectroscopy