1. XRD patterns of CsPbBr₃, TiO₂ and CsPbBr₃@TiO₂

2. TEM images of CsPbBr₃ (a) and CsPbBr₃@TiO₂ (b), and (c) HRTEM image of CsPbBr₃@TiO₂

3. FT-IR spectra of CsPbBr₃, TiO₂ and CsPbBr₃@TiO₂

4. Survey XPS spectrum of CsPbBr₃@TiO₂ (a), and high resolution XPS spectra of Ti2p (b) and O1s (c)

5. (a) Comparison of photocatalytic activities of CsPbBr₃, TiO₂ and CsPbBr₃@TiO₂ for degradation of Rhodamine B under visible light irradiation; (b) TEM image of recycled CsPbBr₃@TiO₂ after the degradation experiment; (c) Comparison of PL spectra of CsPbBr₃@TiO₂ before and after the degradation experiment; (d) Cycle runs of the photocatalytic degradation of RhB over CsPbBr₃@TiO₂

6. (a) Photocurrent responses of CsPbBr₃, TiO₂ and CsPbBr₃@TiO₂, and (b) Photocatalytic mechanism of CsPbBr₃@TiO₂ composite