Fig. 1. Schematic diagram of BA₂MA₃Pb₄I₁₃ perovskite

Fig. 2. XRD patterns of BA₂MA₃Pb₄I₁₃ perovskite before and after phase purification

Fig. 3. （a） UV-Vis absorption spectra of phase purified and unpurified BA₂MA₃Pb₄I₁₃ perovskites； （b） optical bandgap phase calculated by Tauc equation for purified and unpurified BA₂MA₃Pb₄I₁₃ perovskite nylon films； PL （c） and TRPL （d） results for phase purified and unpurified BA₂MA₃Pb₄I₁₃ perovskites

Fig. 4. （a） Resistivity test of phase purified device and unpurified perovskite； bias-dependent photocurrents of unpurified （b） and pure phased （c） materials and corresponding μτ products； （d） mobility of holes and electrons in the phase purified material under different electric fields； ln（σT）-1 000/T curve of （e） phase purified device and （f） unpurified perovskite

Fig. 5. （a） Response of phase purified and unpurified BA₂MA₃Pb₄I₁₃-LP detectors to X-rays at 210 V bias； （b） dose-dependent signal-to-noise ratio （SNR） of X-rays at 210 V bias； X-ray irradiation stability of unpurified devices （c） and phase purified devices （d）