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Valence-band photoemission of the H-plasma annealed (100) textured CVD diamond surface

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Schedel-Niedrig,  Thomas
Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Francz, G., Kania, P., Oelhafen, P., Schedel-Niedrig, T., Schlögl, R., & Locher, R. (1996). Valence-band photoemission of the H-plasma annealed (100) textured CVD diamond surface. Surface Science, 365(3), 825-830. doi:10.1016/0039-6028(96)00756-X.


Cite as: https://hdl.handle.net/21.11116/0000-000A-1089-9
Abstract
A (100) textured chemical vapor deposited (CVD) diamond thin film was exposed to a hydrogen plasma at 850°C as a cleaning procedure and was subsequently investigated by X-ray absorption spectroscopy (XAS) and ultraviolet photoelectron spectroscopy (UPS) with synchrotron radiation in the range 30 eV < hv < 150 eV. The dominant feature of the UPS spectra between 30 and 60 eV excitation energy is the presence of a distinct peak at around 1.8 eV below the Fermi level. This feature can be identified as a surface state of the reconstructed diamond (100) surface. In analogy to reported UPS measurements of reconstructed natural diamonds of (100) orientation reported earlier, the results are discussed in terms of a surface reconstruction of the (100) textured CVD diamond film. The electronic properties of the (100) textured CVD diamond thin film are compared to the ones of annealed or H-plasma exposed natural diamond (100). The UPS measurements of a hydrogen-plasma exposed, reconstructed (100) textured CVD diamond surface discussed here are, to our knowledge, the first reported.