Fig. 1. Photos of the CsSnBr₃ crystal

Fig. 2. PXRD patterns of CsSnBr₃ prepared by different methods

Fig. 3. Hall effect curves of CsSnBr₃ samples

Fig. 4. Statistical data on electrical properties of a large number of CsSnBr₃ samples

Fig. 5. Schematic diagram of Sn （Ⅳ） protection

Fig. 6. Schematic diagram of Sn（Ⅳ） from different directions

Fig. 7. UV-Vis-NIR diffuse reflection spectrum and analysis of CsSnBr₃

Fig. 8. PL spectra of CsSnBr₃ prepared at different conditions

Fig. 9. Morphology characterization and component analysis of impurity crystals

Fig. 10. Structural analysis of impurity crystals

Fig. 11. Electrical properties of of crystals obtained at different Cs-Sn ratios

Fig. 12. XRD patterns of surface precipitates of CsBr and SnBr₂ under excessive conditions