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Figure 1
The A (green), B (blue), and X (red) sites in conventional and hybrid perovskites, showing the larger A-site ions possible as the length of the X-site linker increases: (a) monatomic X and A (Goldschmidt, 1927BB11); (b) diatomic X = cyanide, A = imidazolium (Zhang et al., 2010BB36); (c) triatomic X = formate, A = guanidinium (Hu et al., 2009BB15).

IUCrJ
Volume 9| Part 5| September 2022| Pages 533-535
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522008673