Bl. Liang et al., Determining the band gap of GaxIn1-xAsySb1-y quaternary alloy by infrared ellipsometric spectroscopy, J INF M W, 19(3), 2000, pp. 188-190
The refractive index spectra of GaxIn1-xAsySb1-y MBE epitaxy layers above,
near and below the band gap were studied by room-temperature infrared ellip
sometric spectroscopy with different compositions. The band-gaps were deter
mined by refractive enhancement. It was found that the band gap energy chan
ges approximately linearly as a function of composition between x=0.2 simil
ar to 0.3.