Photoluminescence measurements were used to investigate the dependence of the optical properties of p-type Cd0.96Zn0.04Te monocrystals upon H passivation conditions. When the material was annealed (500C, 5h) in a Cd atmosphere, a luminescence which was due to the recombination of electrons (in the conduction band) with acceptors, eA, and to donor-acceptor pair transitions, disappeared. When the material was hydrogenated, the intensity of the exciton luminescence increased, so that the eA and donor-acceptor pair peaks which were related to Cd vacancies disappeared. The defect band in the low-energy range (1.4 to 1.5eV) also vanished. The results indicated that H atoms passivated not only shallow donors but also deep acceptor impurities, and that the H atoms were separated from the hydrogenated samples at 400C, due to their thermal energy.

M.D.Kim, T.W.Kang, J.M.Kim, H.K.Kim, Y.T.Jeoung, T.W.Kim: Journal of Applied Physics, 1993, 73[8], 4077-9