Fig. 6(Color online) Raman spectra of hexagonal Ge microcrystals formed by Al-based nano-absorbers. (a) optical image. (b) Raman spectrum of dew. (c) Raman spectrum of a typical hexagonal Ge microcrystal at an incident laser intensity of 2.5 mW in
(b). (d) Raman spectrum at the center of hexagonal Ge microcrystals. (e) 394 μm hexagonal Ge microcrystals. (e-1) enlarged FE-SEM image. (f) E
2g mode change according to the position of hexagonal Ge microcrystals. (g) EDS mapping for cross-sectional of hexagonal Ge microcrystal.
