Optical absorption near the threshold in n-type crystals InP, InAs and their solid solutions InPxAs1−x

Reflection spectra of highly doped n-InPxAs1-x solid solutions

“…In addition the authors [8], [9] consider that the energy gap Eg of InP xAs 1 -x varies linearly with the composition ; they use results of [2], [4] which at present should be considered invalid since the energy gap is calculated there using values of the absorption coefficient K = 10. As has been shown in [6], there are exponential absorption tails , in this spectral range ; therefore in the above references the values of Eg were too low. This is confirmed by the data obtained in [13], [14], where it is shown that Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:01974003504036500 the plot of energy gap versus composition has the form Eg = A + Bx + Cx2 where A, B and C are constants.…”

“…The values of carrier effective mass were determined according to eq. (6). Selection of the theoretical curve was performed by computer.…”