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Colour-causing defects and their related optoelectronic transitions in single crystal CVD diamond
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Khan, R. U. A., Cann, B. L., Martineau, P. M., Samartseva, J., Freeth, J. J. P., Sibley, S. J., Hartland, C. B., Newton, Mark E., Dhillon, H. K. and Twitchen, D. J. (2013) Colour-causing defects and their related optoelectronic transitions in single crystal CVD diamond. Journal of Physics: Condensed Matter, Volume 25 (Number 27). Article number 275801. doi:10.1088/0953-8984/25/27/275801
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Official URL: http://dx.doi.org/10.1088/0953-8984/25/27/275801
Abstract
Defects causing colour in nitrogen-doped chemical vapour-deposited (CVD) diamond can adversely affect the exceptional optical, electronic and spintronic properties of the material. Several techniques were used to study these defects, namely optical absorption spectroscopy, thermoluminescence (TL) and electron paramagnetic resonance (EPR). From our studies, the defects causing colour in nitrogen-doped CVD diamond are clearly not the same as those causing similar colour in natural diamonds. The brown colour arises due to a featureless absorption profile that decreases in intensity with increasing wavelength, and a broad feature at 360 nm (3.49 eV) that scales in intensity with it. Another prominent absorption band, centred at 520 nm (2.39 eV), is ascribed to the neutral nitrogen–vacancy–hydrogen defect. The defects responsible for the brown colour possess acceptor states that are 1.5 eV from the valence band (VB) edge. The brown colour is removed by heat treatment at 1600 ° C, whereupon new defects possessing shallow (<1 eV) trap states are generated.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0953-8984 | ||||
| Official Date: | 2013 | ||||
| Dates: |
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| Volume: | Volume 25 | ||||
| Number: | Number 27 | ||||
| Page Range: | Article number 275801 | ||||
| DOI: | 10.1088/0953-8984/25/27/275801 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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