In the deep-level transient spectroscopy
(DLTS) spectra of the 3d-transition metals cobalt and chromium in p-type
germanium, evidence is obtained that hole emission from defect levels can occur
by two parallel paths. Besides classical thermal emission, we observed a
second, slower and temperature-independent emission. We show that this extra
emission component allows determining unambiguously whether or not multiple
DLTS peaks arise from the same defect. Despite similar characteristics, we
demonstrate that the origin of the non-thermal emission is not tunnelling but
photoionization related to black-body radiation from an insufficiently shielded
part of the cryostat.
Source:IOPscience
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