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Photoemission study of the SiO₂conversion mechanism to magnesium silicate

Casey, Patrick and Hughes, Greg (2010) Photoemission study of the SiO₂conversion mechanism to magnesium silicate. Journal of Applied Physics, 107 (7). 0741071-0741075. ISSN 0021-8979

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Abstract

The objective of this work is to investigate interface chemistries which minimize the interfacial silicon oxide transition region at Si/high-k dielectric interfaces. We report on the mechanism by which a silicon native oxide layer is converted into magnesium silicate. The deposition of metal Mg onto a SiO native oxide surface resulted in the formation of a magnesium silicide in addition to substochiometric silicon oxides and a significant decrease in the oxidised silicon signal. Annealing to 300 °C resulted in the decomposition of the magnesium silicide, oxidation of the Mg, and the desorption of excess metallic Mg. Subsequent annealing to 500 °C resulted in converting the SiO2 into magnesium silicate. The results suggest that the decomposition of the Mg silicide in the presence of the residual native oxide facilitates silicate formation at 500 °C. Due to the reported thermal stability of Mg silicate it is suggested that this process may be beneficial in modifying the interface characteristics of the Si/high-k dielectric interface which has potentially significant implications for future semiconductor device generations.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:annealing; chemical interdiffusion; high-k dielectric thin films; magnesium; metal-insulator boundaries; photoemission; silicon compounds; thermal stability;
Subjects:Physical Sciences > Thin films
Physical Sciences > Physics
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:American Institute of Physics
Official URL:http://dx.doi.org/10.1063/1.3357392
Copyright Information:© 2010 American Institute of Physics
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, Irish Research Council for Science Engineering and Technology
ID Code:15580
Deposited On:28 Jul 2010 13:40 by DORAS Administrator. Last Modified 28 Jul 2010 13:40

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