| Autor: |
Khan RU; De Beers UK Ltd, De Beers Research Centre, Belmont Road, Maidenhead, Berkshire SL6 6JW, UK., Cann BL, Martineau PM, Samartseva J, Freeth JJ, Sibley SJ, Hartland CB, Newton ME, Dhillon HK, Twitchen DJ |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2013 Jul 10; Vol. 25 (27), pp. 275801. Date of Electronic Publication: 2013 Jun 17. |
| DOI: |
10.1088/0953-8984/25/27/275801 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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