Vacancy-donor complexes in highly n-type Ge doped with As, P and Sb

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • University of Münster


Positron annihilation spectroscopy was performed to study defects in Ge doped with As, P and Sb. In each case, the samples had approximately the same dopant concentration ∼1019 cm-3. Results from the Doppler broadening and positron lifetime spectroscopies were compared to electronic structure calculations. The positron lifetime results show that the open volume related to the defect centers is not larger than a monovacancy. The results suggest that in the As doped sample the dominant trap at room temperature is a complex consisting of a vacancy and at least three dopant atoms. In the case of P doped Ge the results indicate that two defect complexes compete in positron trapping. Complexes with a higher number of P atoms around the vacancy seem to dominate at room temperature whereas at low temperature positron trapping at centers with fewer P atoms around the vacancy becomes more significant. The complexes with fewer P atoms are more negatively charged. In Sb doped Ge the results suggest that several types of traps are simultaneously competing in positron trapping at all measurement temperatures.


Original languageEnglish
Article number335801
Pages (from-to)1-7
JournalJournal of physics: Condensed matter
Issue number33
Publication statusPublished - 28 Jun 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • E-center, germanium, positron, vacancy, vacancy complex

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