Time Dependence of Charge Transfer Processes in Diamond Studied with Positrons

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
217403/1-5
Series
Physical Review Letters, Volume 107, Issue 21
Abstract
We have developed a method called optical transient positron spectroscopy and apply it to study the optically induced carrier trapping and charge transfer processes in natural brown type IIa diamond. By measuring the positron lifetime with continuous and pulsed illumination, we present an estimate of the optical absorption cross section of the vacancy clusters causing the brown color. The vacancy clusters accept electrons from the valence band in the absorption process, giving rise to photoconductivity.
Description
Keywords
diamond, positron, optical, transient
Other note
Citation
Mäki, J.-M. & Tuomisto, Filip & Varpula, A. & Fisher, D. & Khan, R. U. A. & Martineau, P. M. 2011. Time Dependence of Charge Transfer Processes in Diamond Studied with Positrons. Physical Review Letters. Volume 107, Issue 21. 217403/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.107.217403