Blast Nucleation Suppressed Growth of Large-Sized High-Quality CsPbBr3 Single Crystals for Photodetector Applications.

During the growth of lead halide perovskite single crystals (SCs) with the conventional inverse temperature crystallization (ITC) method, the blast nucleation of the precursor under supersaturation conditions is always unavoidable. In the current study, three kinds of additives namely methanol (MOE), ethyl alcohol (EtOH), and polyethylene glycol (PEG) are introduced to regulate the growth of CsPbBr3 SCs. Benefiting from the strong anchoring hydroxy groups (-OH) with the Pb2+ species, large-sized CsPbBr3 crystals with reduced defect densities were prepared (PEG-regulated). In addition, the viscosity of the precursor solution increases after adding PEG additive, which provides a more stabilized environment for crystal growth. Finally, the photodetectors prepared from our PEG-tuned CsPbBr3 SCs show a responsivity of 2.25 A/W and a detectivity of 6.06 × 1011 Jones, demonstrating the potential of CsPbBr3 SCs for photo-detecting applications.