On natures of sub-gap photoelectric and optical spectra in nitrogen-contaminated nanocrystalline diamond
Ligatchev, V., Ong, K.P., Wu, P., & Ostrikov, K. (2007) On natures of sub-gap photoelectric and optical spectra in nitrogen-contaminated nanocrystalline diamond. ECS Transactions, 6(16), pp. 101-106.
Experimentally observed optical and photoelectrical spectra of nitrogen-contaminated (unintentionally doped) nano-crystalline CVD diamond films are simulated using semi-empirical adiabatic General Skettrup Model (GSM), which presumes dominant contributions of defect states from sp 3-coordinated intra-granular carbon atoms to intra-band single electron spectrum N(E) of the material. This picture disagrees with a common viewpoint that the N(E) spectrum of the gap states in diamond powders and polycrystalline CVD films mainly originates from π and π* bonds of sp2-coordinated carbon atoms, which are distributed nearly uniformly over outer surfaces and/or interfaces of the diamond grains. The GSM predicts as well strong effect of granular morphology on the density of intra-band defect states in polycrystalline diamonds.
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|Item Type:||Journal Article|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Copyright Owner:||Copyright 2007 The Electrochemical Society|
|Deposited On:||16 Jul 2014 04:30|
|Last Modified:||17 Jul 2014 02:54|
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