As a member of the lead-halide perovskite family, inorganic perovskite CsPbBr3 exhibits excellent optical and electrical properties with higher stability to the environment. However, former efforts to obtain large-size CsPbBr3 single crystals with satisfactory quality using low temperature solution methods reached limited results. In this work, we have studied the growth of CsPbBr3 crystals using the antisolvent vapor-assisted crystallization (AVC) method. By adjusting the mole ratio of PbBr2 and CsBr, the phase diagram of the final products is acquired. Five regions are identified, including the Cs4PbBr6 single phase region, Cs4PbBr6 and CsPbBr3 two phases region, CsPbBr3 single phase region, CsPbBr3 and PbBr2­·2­[(CH3)2SO] metastable two phases region, and CsPbBr3 and PbBr2­·2­[(CH3)2SO] two phases region. Three methods are adopted to improve the size and crystalline quality of CsPbBr3. The growth rate is effectively tailored by diluting the antisolvent MeOH solution using DMSO to reduce the MeOH vapor pressure. Centimeter-size bright CsPbBr3 crystals have been obtained. The room temperature bandgap of CsPbBr3 is estimated at ∼2.29 eV by the transmission spectra. The photoluminescence spectra show two strong emission peaks, located at 530 and 555 nm, respectively, which are related to the free and bond excitons. The resistivity is as large as 2.1 × 109 Ω·cm. Hall effect measurements demonstrate the CsPbBr3 is p-type conductivity with a hole carrier concentration of 4.55 × 107 cm–3 and the mobility of 143 cm2 V–1 s–1. The resulting Au/CsPbBr3/Au device exhibits strong photoresponse to optical light, with an on–off ratio of two orders under a light emitting diode (∼1 mW/cm2) with a wavelength of 365–420 nm. Our research would shed more light on the growth and the photoresponse properties of CsPbBr3 crystals.

Cs3Bi2I9 single crystals with significant anisotropies show a capability of detecting 241Am@5.49 MeV α particles ((FWHM) of ∼32%).

Cs3Bi2I9 single crystals grown by a low temperature solution method.

Methylammonium (MA) lead hybrid perovskite single crystal recently received attention as a potential radiation detection material. Here, we report the MAPbBr 3 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 MAPbBr 3 crystals to significantly increase from 2 × 2 × 1 to 15 × 15 × 5 mm 3 . The morphology evolution of MAPbBr 3 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 MAPbBr 3 crystals exhibit high resistivity (5.6 × 10 8 Ω•cm) at room temperature. The mobility−lifetime (μτ) products are measured under 241 Am (5.48 MeV) α particles irradiation, with the values of 2.2 × 10 −4 and 4.2 × 10 −4 cm 2 /V for electrons and holes, respectively. Simultaneously, the electrons and holes mobility are estimated to be 24.6 and 59.7 cm 2 /(V•s), respectively, using the α-source-induced transient waveforms.

For the purpose of developing Cs2TeI6 based X-ray detectors and imaging devices, Cs2TeI6 thick films were prepared using the electrospray method under ambient conditions.