Large-Size and Polarization-Sensitive Two-Dimensional Sn Perovskite Single Crystals

High-quality and large-size perovskite single crystals are emerging aspromising materials for optoelectronic devices including solar cells, high energyradiation sensing, and visible light detection. Low-dimensional perovskite structures have aroused great attention recently for its unique properties such as large carriermobility and anisotropic properties. However, there are lack of methods to growhigh-quality and large-size low-dimensional perovskite single crystals. Herein, byusing ethylene glycol as solvent to increase the coordination between precursor and solutes, the nucleation barrier is increased allowing slow nucleation and crystal growth. As a result, large-size two-dimensional (2D) tin perovskite single crystals with smooth surface are synthesized for the first time. A photodetector is fabricatedbased on this single crystal and it shows linear-polarized light sensing. The theoretical simulation is explored to explain theanisotropic properties of 2D perovskite structures. In the end, a heterojunction is fabricated based on the epitaxy growth of 2Dlead perovskite on the 2D tin perovskite single crystal.

Automated summary

In this study, high-quality and large-size two-dimensional perovskite single crystals were successfully synthesized using a specific solvent. These crystals were then used to fabricate a photodetector and heterojunction.