13.2 Two-Dimensional Compound Semiconductors
393
Fig. 13.14 a Crystal structure of BC 2 N with unit cell indicated. b Brillouin zone of BC 2 N (rectangle) and C, BN
(hexagon, cmp. Fig. 13.1b). c Phonon dispersion of graphene (C) and BN- and BC 2 N-sheets. Adapted from [1285]
Fig. 13.15 Phonon dispersion of MoS 2 monolayer. ZA: out-of plane acoustic mode, NP: non-polar optical modes, HP:
homopolar modes. On the right, the phonon density of states (DOS) is shown for Mo 2 (red solid line) and for WS 2 (blue
dashed line) in comparison. Dispersion adapted from [1288], DOS adapted from [1287]
Fig. 13.16 Band structure of monolayer, bilayer and bulk WSe 2 . The blue (green) arrows indicate the direct (indirect)
band-band transitions. Based on [1272]
393
Fig. 13.14 a Crystal structure of BC 2 N with unit cell indicated. b Brillouin zone of BC 2 N (rectangle) and C, BN
(hexagon, cmp. Fig. 13.1b). c Phonon dispersion of graphene (C) and BN- and BC 2 N-sheets. Adapted from [1285]
Fig. 13.15 Phonon dispersion of MoS 2 monolayer. ZA: out-of plane acoustic mode, NP: non-polar optical modes, HP:
homopolar modes. On the right, the phonon density of states (DOS) is shown for Mo 2 (red solid line) and for WS 2 (blue
dashed line) in comparison. Dispersion adapted from [1288], DOS adapted from [1287]
Fig. 13.16 Band structure of monolayer, bilayer and bulk WSe 2 . The blue (green) arrows indicate the direct (indirect)
band-band transitions. Based on [1272]