Time dependence of charge transfer processes in diamond studied with positrons

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Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2011-11

Major/Subject

Mcode

Degree programme

Language

en

Pages

5
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.

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Keywords

diamond, optical, positron, transient

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Citation

Mäki , J-M , Tuomisto , F , Varpula , M , Fisher , D , Khan , R U A & Martineau , P M 2011 , ' Time dependence of charge transfer processes in diamond studied with positrons ' , Physical Review Letters , vol. 107 , no. 21 , 217403 , pp. 1-5 . https://doi.org/10.1103/PhysRevLett.107.217403