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. 2017 Apr 10;11(4):3819–3831. doi: 10.1021/acsnano.7b00017

Figure 1.

Figure 1

(a) Sketch of the 3D arrangement of the PbX6 octahedra in CsPbX3 perovskites exhibiting a cubic (C), tetragonal (T), or orthorhombic (O) structure; the symmetry descent is related to small coherent displacements of halides, leading to bending of Pb–X–Pb angles with θab= θc = 180° (C), θab< 180° and θc = 180° (T), and θab= θc < 180° (O). Atomic species in the top (a) and side (c) views are Cs = violet, Pb = gray, X = green, brown, cyan. (b) Equatorial (Xeq) and axial (Xax) halides in the PbX6 octahedron are highlighted in blue and red, respectively.