Time dependence of charge transfer processes in diamond studied with positrons

J. M. Mäki (Corresponding Author), F. Tuomisto, A. Varpula, D. Fisher, R. U.A. Khan, P. M. Martineau

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

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.

Original languageEnglish
Article number217403
JournalPhysical Review Letters
Volume107
Issue number21
DOIs
Publication statusPublished - 16 Nov 2011
MoE publication typeNot Eligible

Fingerprint

time dependence
positrons
diamonds
charge transfer
photoconductivity
absorption cross sections
optical absorption
illumination
trapping
optics
valence
color
life (durability)
estimates
spectroscopy
electrons

Cite this

Mäki, J. M. ; Tuomisto, F. ; Varpula, A. ; Fisher, D. ; Khan, R. U.A. ; Martineau, P. M. / Time dependence of charge transfer processes in diamond studied with positrons. In: Physical Review Letters. 2011 ; Vol. 107, No. 21.
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Time dependence of charge transfer processes in diamond studied with positrons. / Mäki, J. M. (Corresponding Author); Tuomisto, F.; Varpula, A.; Fisher, D.; Khan, R. U.A.; Martineau, P. M.

In: Physical Review Letters, Vol. 107, No. 21, 217403, 16.11.2011.

Research output: Contribution to journalArticleScientificpeer-review

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