High-resolution photoemission study of acetylene adsorption and reaction with the Si(100)-2x1 surface
- LBNL Library
The adsorption and reaction of acetylene with the Si{approximately}100-231 surface has been studied using high-resolution photoemission by monitoring the Si 2p,C 1s, and valence-band (VB) spectra as a function of both acetylene coverage and post-adsorption annealing temperature. After the clean Si(100) surface is exposed to 0.5 monolayer (ML) acetylene, the surface state in the VB is absent. Meanwhile, the curve-fitting results show that there is only one interface component in the Si 2p core level. These results indicate that the asymmetric Si dimers may become symmetric dimers after acetylene adsorption, which can be explained well by the tetra-sigma model determined from our previous photoelectron holographic results. Significant changes in the electronic structure (Si 2p,C 1s, and VB) are found after subsequent annealing of the saturation overlayer. Annealing at lower temperature can induce some acetylene molecule desorption while most of the molecules decompose into C2Hx (x=1,0) and H species. After annealing above 660C, both of the reacted components of the Si 2p and C 1s lines show that the SiC species form clusterlike features. At the same time, the VB and Si 2p spectra indicate a restoration of a Si(100)-2x1 structure, and the asymmetric Si dimers reappear on the surface.
- Research Organization:
- Lawrence Berkeley National Lab., CA (US)
- Sponsoring Organization:
- USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 771869
- Report Number(s):
- LBNL--46088
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 60
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-resolution photoemission study of acetylene adsorption and reaction with the Si(100)-2{times}1 surface
Ab initio study of adsorption and decomposition of NH{sub 3} on Si(100)-(2x1)
Experimental and theoretical NEXAFS/XPS study of the room-temperature adsorption of acetonitrile on Si(001)-2x1
Journal Article
·
Fri Oct 01 00:00:00 EDT 1999
· Physical Review, B: Condensed Matter
·
OSTI ID:692556
Ab initio study of adsorption and decomposition of NH{sub 3} on Si(100)-(2x1)
Journal Article
·
Wed Mar 22 23:00:00 EST 2000
· Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
·
OSTI ID:20026924
Experimental and theoretical NEXAFS/XPS study of the room-temperature adsorption of acetonitrile on Si(001)-2x1
Journal Article
·
Fri Apr 15 00:00:00 EDT 2005
· Physical Review. B, Condensed Matter and Materials Physics
·
OSTI ID:20665146