Abstract
A noncontact, nondestructive optical technique with potential to measure the acceptor impurity concentrations in bulk CdTe and Cd1−xZnxTe alloys is described here. The technique, called optical quenching, uses an infrared light source in conjunction with the above-band-gap excitation beam used in standard photoluminescence spectroscopy. The quenching, or decrease, of acceptor-bound exciton emission is related to the incident infrared beam flux. The rate at which the infrared photons ionize neutral acceptors can be used to determine relative concentrations of the substitutional centers. We have applied this technique to the copper acceptor-bound exciton in CdTe and Cd1−xZnxTe bulk samples. The 1.064 μm output from a Nd:YAG laser provided near-resonant absorption with the copper acceptor level. Relative copper concentrations in the range from 4×1014 to 1×1016 cm−3 were obtained. These values agree reasonably well with sample comparisons based on atomic absorption data.
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