Abstract

We investigate impurity pair and triad formations in the narrow band-gap semiconductor n-doped InSb. It is found that in the region of the band-gap energy, E g = 0.23 eV, at 0 K, the effects of such clusters play a relevant role in the optical properties around and below the ionization energy of an isolated impurity (i.e., E i = 0.64 meV). The transition for the uncompensated system is obtained as the concentration of impurities exceeds N c = 4.7 × 10 13 cm −3.

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