Optical properties of wurtzite structure GaN on sapphire around fundamental absorption edge (0.78–4.77 eV) by spectroscopic ellipsometry and the optical …

G Yu, G Wang, H Ishikawa, M Umeno, T Soga… - Applied Physics …, 1997 - pubs.aip.org
Spectroscopic ellipsometry (SE) together with the optical transmission method is
successfully used to determine the refractive index n and absorption coefficient α of
undoped gallium nitride film over the spectral range of 0.78–4.77 eV of photon energy. The
SE measurement is carried out at angle of incidence of 60° over the 1.5–4.77 eV energy
range and optical transmission measurement over the 0.78–3.55 eV energy range. The
refractive index n and absorption coefficient α obtained by both methods show unique …
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