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Updated: May 26, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Time dependence of charge transfer processes in diamond studied with positrons
J-M Mäki1, F Tuomisto, A Varpula
1Department of Applied Physics, Aalto University, Espoo, Finland. jussi-matti.maki@aalto.fi
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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