Fig. 7.

a Image of Cs₂AgBiBr₆ powder (left) and solution in DMSO (right). b The film fabrication process diagram. c, d SEM images of film obtained by traditional thermally annealed and low-pressure-assisted process, respectively, inset: film photograph, size, 25 × 25 mm². Reproduced with permission from Ref. [97]. e Schematic illustration of the spin-coating process with and without anti-solvent dropping protocol; the morphology of the as-prepared film can be improved after IPA dropping. Reproduced with permission from Ref. [98]. f Scheme of sequential vapor deposition processing of Cs₂AgBiBr₆ double perovskite. Reproduced with permission from Ref. [100]