Charge Transport Behavior in Solution-Grown Methylammonium Lead Tribromide Perovskite Single Crystal Using α Particles

Methylammonium (MA) lead hybrid perovskite single crystal recently received attention as a potential radiation detection material. Here, we report the MAPbBr₃ bulk crystals grown by the modified antisolvent vapor-assisted crystallization method. The growth rate is determined by diluting the antisolvent, which results in the average size of MAPbBr₃ crystals to significantly increase from 2 × 2 × 1 to 15 × 15 × 5 mm³. The morphology evolution of MAPbBr₃ crystals, which is contributed by the growth anisotropy, has been discussed according to the molar ratios of precursors and the bond theory. The resulting centimeter-sized MAPbBr₃ crystals exhibit high resistivity (5.6 × 10⁸ ω·cm) at room temperature. The mobility-lifetime (μ τ) products are measured under ²⁴¹Am (5.48 MeV) α particles irradiation, with the values of 2.2 × 10^-4 and 4.2 × 10^-4 cm²/V for electrons and holes, respectively. Simultaneously, the electrons and holes mobility are estimated to be 24.6 and 59.7 cm²/(V·s), respectively, using the α-source-induced transient waveforms.