Near-Net-Shaped Growth of Inch-Sized MAPbBr₃ Bulk Crystal by the Space-Confined Seeded Solution Method

The organic–inorganic hybrid halide perovskite MAPbBr₃ has been considered as a promising material in many applications; however, the bulk MAPbBr₃ crystals grown by the widely adopted inverse temperature crystallization (ITC) method without forced convection reveal poor reproducibility and moderate quality. Here, we employ a near-net-shape seeded solution method to grow inch-sized MAPbBr₃ crystals as a space-confined way to approach the suitable thickness and minimize the loss resulting by cutting and polishing. The rotation parameters for introducing forced convection is determined according to solute transport behavior, which is associated with the space confinement thickness and rotation rate. The as-grown MAPbBr₃ crystal with good homogeneity exhibits a recorded FWHM value of 0.011° in the high-resolution X-ray diffraction rocking curve, ascribed to the lower grown-in stress and strain by the liquid-phase epitaxial growth. Finally, the MAPbBr₃ semiconducting photodetector demonstrates a relatively high resistivity of 3.75 × 10⁸ Ω·cm and superior photoresponse under 405 nm laser. The near-net-shape synthesis method with a space confinement is potentially extended to the growth of other halide perovskite bulk crystals.