Abstract

The effects of a non-abrupt space-charge region and finite duration of the refilling pulse and the repetition period on deep trap profiling by DLTS are analyzed for the case of small relative capacitance changes (ΔC ≪ C). An approach is suggested and expressions are obtained which allow to evaluate deep trap profiles through the dependence of the DLTS signal on the refilling pulse voltage with accurate account for these effects with the help of a simple computer program. The method proposed is essential when small trap concentrations in inhomogeneously and low-doped semiconductors are examined or when small filling pulses are implied in DLTS measurements.

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