Magnetophotoluminescence of neutral acceptor states in InSb

Abstract

Magnetophotoluminescence experiments on n-type bulk indium antimonide crystals have been performed using a cryogenically cooled interferometer. Both donor–acceptor-pair and free electron-to-neutral acceptor recombination transitions have been observed for four distinct acceptor species. Despite the small difference in the cadmium and germanium binding energies, the high-resolution photoluminescence experiments presented were able to resolve the two acceptors. Acceptor binding energies for Cd, 72.3 cm−1 (8.96 meV), and Ge, 69.0 cm−1 (8.55 meV), are consistent with previously published results. Two unknown acceptors having binding energies of 99.6 cm−1 (12.35 meV) and 161.9 cm−1 (20.07 meV) are also discussed.