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Title: | The role of (sub)-surface oxygen on the surface electronic structure of hydrogen terminated (100) CVD diamond | Authors: | DEFERME, Wim Tanasa, G. Amir, J. HAENEN, Ken NESLADEK, Milos Flipse, C.F.J. |
Issue Date: | 2006 | Publisher: | Elsevier | Source: | DIAMOND AND RELATED MATERIALS, 15(4-8). p. 687-691 | Abstract: | In this work, scanning tunnelling microscopy (STM) and scanning tunnelling spectroscopy (STS) were applied to investigate the surface morphology and the surface electronic structure of plasma-treated (100)-oriented CVD diamond films. These films were hydrogenated using a conventional MWPE-CVD (microwave plasma enhanced chemical vapour deposition) reactor containing a H2 or a H2 / O2 mixture. A comparison is made between (100)-oriented CVD diamond films hydrogenated with and without a small addition of oxygen (1%). X-ray Photoelectron Spectroscopy (XPS) and UV Photoelectron Spectroscopy (UPS) measurements point to the presence of O-atoms at the (sub)-surface of the diamond film. The measured conductivity is significantly different for the two processes of hydrogenation. Annealing experiments point out that the samples, which were terminated using the H2 / O2 mixture are still conductive enough after annealing at 410 °C to enable STM experiments. Here, we discuss the mechanism for STM imaging of H2 / O2 treated diamond films, associated with surface states induced by the oxygen incorporation. | Keywords: | Diamond properties and applications; Surface conductivity; Scanning tunnelling spectroscopy; Oxygen plasma treatment | Document URI: | http://hdl.handle.net/1942/1413 | ISSN: | 0925-9635 | e-ISSN: | 1879-0062 | DOI: | 10.1016/j.diamond.2005.12.016 | ISI #: | 000239157000048 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2007 |
Appears in Collections: | Research publications |
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