Photoemission studies of the reactions of ammonia and N atoms with Si(100)-(2×1) and Si(111)-(7×7) surfaces
- 15 August 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 38 (6), 3937-3942
- https://doi.org/10.1103/physrevb.38.3937
Abstract
We present results of detailed x-ray photoemission and ultraviolet photoemission spectroscopic studies of the reactions of silicon with ammonia and atomic nitrogen. We show that both Si(100)-(2×1) and Si(111)-(7×7) surfaces are very reactive towards ammonia, which adsorbs dissociatively even at 100 K. The extent of dissociation and the dissociation products are different on the two surfaces. On Si(100) the ammonia dissociates to NH while on Si(111) it dissociates to . On the Si(100) surface the NH species has a lower thermal stability, starting to dissociate at around 500 K. The species on Si(111) is stable up to ∼700 K. We explain the above general features in terms of the dangling-bond structure of Si(100)-(2×1) and Si(111)-(7×7) surfaces.
Keywords
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