The electrical properties of a series of CdTe:Cl samples cut from the same crystal boule are reported. Measurement of the thermal activation energies for both ohmic and space-charge-limited conduction reveals that the conductivity of the samples is controlled by two localised impurity levels within the band gap. A deep level at approximately 0.98 eV above the valence band edge is found in all specimens but the energy depth of the second level is a function of the position of the sample in the crystal boule and the temperature of any annealing treatment. The conductivity of the samples also obeys the Meyer-Neldel rule or compensation law.
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Petty et al. (1980) studied this question.
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