SiO/sub 2//Si interface probed with a variable-energy positron beam

Journal Article · Mon Sep 28 04:00:00 EDT 1987 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.98818· OSTI ID:6230044

Nielsen, B; Lynn, K G; Chen, Y; Welch, D O

The annihilation characteristics of a monoenergetic beam of positrons, after implantation in Si with a 350-nm overlayer of SiO/sub 2/, were measured as a function of mean implantation depth. Positrons implanted overlapping the SiO/sub 2//Si interface were observed to decay from a state with properties distinctively different from the state in bulk Si and the thermally grown SiO/sub 2/, i.e., a positron interface state. The momentum distribution of the annihilating positron-electron pair, as observed in the Doppler broadening of the annihilation line, is much broader for this state than for either bulk Si or SiO/sub 2/, in contrast to previously observed localized positron states in solids and at surfaces which show a narrower distribution.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6230044
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 51:13; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BEAMS
CHALCOGENIDES
COLLISIONS
DOPPLER BROADENING
ELECTROMAGNETIC INTERACTIONS
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
INTERACTIONS
INTERFACES
LEPTON BEAMS
LEPTONS
LINE BROADENING
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
POSITRON BEAMS
POSITRON COLLISIONS
POSITRONS
SEMIMETALS
SILICA
SILICON
SILICON COMPOUNDS
SILICON OXIDES