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. 2018 Nov 27;4(1):54–62. doi: 10.1021/acsenergylett.8b02207

Figure 2.

Figure 2

(A) Photographs of CsPbBr3–xIx films (x = 0.63) with different crystalline sizes, taken under visible light and UV light. (B) TEM image of CsPbBr3–xIx NPs (x = 0.63). (C) SEM image of CsPbBr3–xIx bulk film (x = 0.63) through agglomeration of nanoparticles upon annealing. (D) Crystalline size determined by SEM of the CsPbBr3–xIx bulk films obtained at 225 °C during different annealing times. (E) FTIR spectra of the CsPbBr3–xIx film (x = 0.63) (a) without ligand exchange (LE), with subsequent (b) ligand exchange, and (c and d) annealing process as a function of time to form bulk film.