Fig. 1. High-resolution transmission electron microscopy image of the CsPbBr₃ material

Fig. 2. (a) The TEM image of the CsPbBr₃ material; (b) the incidence of electrons with an energy of 2 MeV

Fig. 3. Sample diagrams of (a) PNC-0, (b) PNC-5, (c) PNC-25, and (d) PNC-50

Fig. 4. (a-d) The TEM images and (e-h) HRTEM images of PNC-0, PNC-5, PNC-25, and PNC-50

Fig. 5. (a) The XRD patterns of PNC-0, PNC-5, PNC-25, and PNC-50; (b-d) the XPS patterns of Br 3d, Pb 4f, and Si 2p orbits

Fig. 6. (a) The optical absorption spectra and (b) the band gap distribution of PNC-0, PNC-5, PNC-25, and PNC-50

Fig. 7. Photoluminescence spectra of PNC-0, PNC-5, PNC-25, and PNC-50

Fig. 8. The band gap of CsPbBr₃ material changes with strain

Fig. 9. The sample diagrams of annealed (a) PNC-5, (b) PNC-25, and (c) PNC-50

Fig. 10. Photoluminescence spectra of PNC-0, PNC-5, PNC-25, and PNC-50 after annealing