Perovskite Bulk Crystals Grown through Antisolvent Droplet-Assisted Crystallization and Associated Wavelength-Dependent Photoluminescence Dynamics

Perovskite bulk crystals (BCs) have been generally synthesized and grown via the temperature-mediated processes. Here, we report a facile strategy of using antisolvent droplets for assisting the crystallization and growth of large high-quality perovskite BCs (similar to 5 mm) at room temperature. The formation of either CsPbBr3 or Cs4PbBr6 BCs was controllable through tuning the composition of solvents used during growth. Such high-quality as-grown BCs were chosen for demonstrating the carrier-lattice interactions under photoexcitation operation. The wavelength-dependent time-resolved photoluminescence dynamics revealed that both the blue-side and red-side solvation-like - effect between the photocarriers and surrounding lattices existed in the BCs, whereas only the blue-side one was obviously observed in the nanocrystals. The antisolvent droplet-assisted crystallization offers a versatile strategy of growing perovskite BCs with tunable compositions, and the distinct solvation behaviors enrich a fundamental understanding of photocarrier energy relaxations in perovskites with nanoscale and bulk forms.

Automated summary

This study presents a facile strategy of using antisolvent droplets for assisting the crystallization and growth of large high-quality perovskite bulk crystals at room temperature. The composition of the solvents used during growth can be tuned to control the formation of different types of bulk crystals. The results also reveal the solvation-like effect between the photocarriers and surrounding lattices in these bulk crystals.