Detection of vacancy-like defects during Cu diffusion in GaAs by positron annihilation

Positron annihilation studies on vacancy defects in group IV semiconductors

Electrical properties of semiconductor materials are greatly influenced by point defects such as vacancies and interstitials. These defects are common and form during the growth and processing of the material. Positron annihilation spectroscopy is a method suitable for detecting and studying vacancy-type lattice defects. In this work, the formation, properties, and annealing of vacancy defects ...

Positron-annihilation study of compensation defects in InP

Vacancy-impurity pairs in relaxed Si1−xGex layers studied by positron annihilation spectroscopy

Positron annihilation spectroscopy was applied to study relaxed P-doped n-type and undoped Si1−xGex layers with x up to 0.30. The as-grown SiGe layers were found to be defect free and annihilation parameters in a random SiGe alloy could be represented as superpositions of annihilations in bulk Si and Ge. A 2 MeV proton irradiation with a 1.6 1015 cm−2 fluence was used to produce saturated posit...

Vacancy profile in reverse osmosis membranes studied by positron annihilation lifetime measurements and molecular dynamics simulations

The positron annihilation technique using a slow positron beam can be used for the study of the vacancy profiles in typical reverse osmosis (RO) membranes. In this study, the vacancy profile in the polyamide membrane that exhibits a high permselectivity between ions and water was studied using the positron annihilation technique and molecular dynamics simulations. Orthopositronium (o-Ps) lifeti...

In- ̄ight annihilation during positron channeling

Energetic positrons propagating along low index directions in a crystal interact strongly with the periodic array of atoms via a process known as channeling. The trajectories of such channeled positrons can be manipulated to sample di€erent spatial regions in the crystal. Here we report the ®rst observations of channeling e€ects on in̄ight annihilation radiation from positrons traversing a thin ...