Positron Lifetime Studies

Overview

Positron lifetime spectroscopy as a non-destructive technique for characterizing defects, vacancies, and microstructural features in various solid materials. This work spans metals, semiconductors, and thin-film systems.

The method exploits the sensitivity of positron annihilation lifetimes to local electron density variations caused by atomic-scale defects.

• Positron Lifetime Spectroscopy of Defects in Semiconductors

  Abstract

  Positron lifetime measurements have been performed on various semiconductor materials to characterize point defects and vacancy-type imperfections. The technique exploits the enhanced positron trapping at open-volume defects, enabling sensitive detection of vacancy concentrations below parts per million.

  Key Results

  Distinct lifetime components corresponding to bulk annihilation and defect-trapped positrons were identified. The defect-related lifetimes are consistent with monovacancy and divacancy models, with concentration estimates derived from two-state trapping analysis.

  August 27, 2026