Diffusion-drift-reaction model for positron trapping and annihilation at interfaces with space charge in bulk materials

Roland Würschum, Gregor Klinser

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The exact solution of a diffusion-drift-reaction model for the trapping and annihilation of positrons at interfaces with adjacent space-charges in bulk materials is presented. Closed-form expressions are obtained for the mean positron lifetime and for the intensity of the positron lifetime component associated with trapping at interfaces. The exact solutions can be conveniently applied for the analysis of experimental data. Compared to available thin-film models, the present approach takes into account that drift usually occurs only in a part of the diffusion zone. The model clearly reveals that for typical drift-zone parameters, positron drift has a substantial impact on the positron annihilation characteristics, that is, disregarding existing drift could lead to misjudgement of experimental positron annihilation data.
Original languageEnglish
Pages (from-to)379-397
JournalThe Philosophical Magazine
Volume100
Issue number3
Publication statusE-pub ahead of print - 24 Nov 2019

Fingerprint

space charge
positrons
trapping
positron annihilation
life (durability)
thin films

Fields of Expertise

  • Advanced Materials Science

Cite this

Diffusion-drift-reaction model for positron trapping and annihilation at interfaces with space charge in bulk materials. / Würschum, Roland; Klinser, Gregor.

In: The Philosophical Magazine, Vol. 100, No. 3, 24.11.2019, p. 379-397.

Research output: Contribution to journalArticleResearchpeer-review

@article{a58cc15b189d44f7b1d7e14adc806bf4,
title = "Diffusion-drift-reaction model for positron trapping and annihilation at interfaces with space charge in bulk materials",
abstract = "The exact solution of a diffusion-drift-reaction model for the trapping and annihilation of positrons at interfaces with adjacent space-charges in bulk materials is presented. Closed-form expressions are obtained for the mean positron lifetime and for the intensity of the positron lifetime component associated with trapping at interfaces. The exact solutions can be conveniently applied for the analysis of experimental data. Compared to available thin-film models, the present approach takes into account that drift usually occurs only in a part of the diffusion zone. The model clearly reveals that for typical drift-zone parameters, positron drift has a substantial impact on the positron annihilation characteristics, that is, disregarding existing drift could lead to misjudgement of experimental positron annihilation data.",
author = "Roland W{\"u}rschum and Gregor Klinser",
year = "2019",
month = "11",
day = "24",
language = "English",
volume = "100",
pages = "379--397",
journal = "The Philosophical Magazine",
issn = "1478-6435",
publisher = "Taylor & Francis Group",
number = "3",

}

TY - JOUR

T1 - Diffusion-drift-reaction model for positron trapping and annihilation at interfaces with space charge in bulk materials

AU - Würschum, Roland

AU - Klinser, Gregor

PY - 2019/11/24

Y1 - 2019/11/24

N2 - The exact solution of a diffusion-drift-reaction model for the trapping and annihilation of positrons at interfaces with adjacent space-charges in bulk materials is presented. Closed-form expressions are obtained for the mean positron lifetime and for the intensity of the positron lifetime component associated with trapping at interfaces. The exact solutions can be conveniently applied for the analysis of experimental data. Compared to available thin-film models, the present approach takes into account that drift usually occurs only in a part of the diffusion zone. The model clearly reveals that for typical drift-zone parameters, positron drift has a substantial impact on the positron annihilation characteristics, that is, disregarding existing drift could lead to misjudgement of experimental positron annihilation data.

AB - The exact solution of a diffusion-drift-reaction model for the trapping and annihilation of positrons at interfaces with adjacent space-charges in bulk materials is presented. Closed-form expressions are obtained for the mean positron lifetime and for the intensity of the positron lifetime component associated with trapping at interfaces. The exact solutions can be conveniently applied for the analysis of experimental data. Compared to available thin-film models, the present approach takes into account that drift usually occurs only in a part of the diffusion zone. The model clearly reveals that for typical drift-zone parameters, positron drift has a substantial impact on the positron annihilation characteristics, that is, disregarding existing drift could lead to misjudgement of experimental positron annihilation data.

M3 - Article

VL - 100

SP - 379

EP - 397

JO - The Philosophical Magazine

JF - The Philosophical Magazine

SN - 1478-6435

IS - 3

ER -