Fig. 4: Phonon dispersion and IR active modes. | NPG Asia Materials

Fig. 4: Phonon dispersion and IR active modes.

From: Unique phonon modes of a CH3NH3PbBr3 hybrid perovskite film without the influence of defect structures: an attempt toward a novel THz-based application

Fig. 4

a The theoretical calculated room-temperature phonon band structure and b IR absorption spectrum of cubic MAPbBr3. Real-space visualization of vibration phonon modes at c 0.59~0.74, d 1.18~1.36, and e 1.8~1.83 THz. Grey, brown, purple, orange, and pink balls denote Pb, Br, C, N, and H atoms, and the blue and red arrows represent the eigenvectors corresponding to the phonon modes.

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