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(a) Ideal cubic unit cell of the CsPbBr3 perovskite crystal lattice; (b) orthorhombic crystal structure of CsPbBr3 nanocrystals, representing an octahedral distortion of the ideal lattice, which consists of a twist of the relatively rigid PbBr6 cage; (c) rocking and (d) breathing phonon mode, of the orthorhombic crystal phase, consisting of vibrations of the PbBr6 octahedra.
