It was shown here, for the first time, that deep defects in single crystals could be passivated by atomic H. This treatment could result in a strong enhancement of the photoluminescence intensity of all excitonic transitions. After hydrogenation, the higher-order emission of free excitons in (Cd,Zn)Te alloys was observed for the first time. On the basis of the experimental results, it was deduced that hydrogenation not only improved material quality but also provided a means for probing the physical properties of the material.

Y.F.Chen, G.S.Tsai, Y.H.Chang, Y.M.Chang, T.K.Chen, Y.M.Pang: Applied Physics Letters, 1991, 58[5], 493-5