Abstract
A physical basis is presented for the previously reported correlation between deep levels in p-type high purity germanium and the energy resolution of corresponding γ-detectors. Taking account of re-emission of trapped holes at 77 K it is shown that effective hole traps are deeper than about E v + 0.07 eV. Slowly re-emitting traps may become saturated during detector operation. The detector resolution criterion L ≤ 2 keV is found to correspond with an upper limit of 4.5 × 10 9 cm −3 for the total active copper density. This density criterion is shown to be a reliable basis for the routine DLTS characterisation of high purity germanium production.
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