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Formation and Characterization of Spe Grown Ultra-Thin Cobalt Disilicide Film

Published online by Cambridge University Press:  10 February 2011

Xin-Ping Qu ,
Guo-Ping Ru ,
Bing-Zong Li ,
C. Detavernier ,
R L. Van Meirhaeghe  and
F. Cardon
Xin-Ping Qu
Affiliation:
Dept. of Electronic Engineering, Fudan University, Shanghai, CHINA xpqu@Fudan.edu.cn
C. Detavernier
Affiliation:
Dept. of Solid State Science, University of Gent, Krijgslaan 281/S 1, B-9000, Gent, Belgium.
R L. Van Meirhaeghe
Affiliation:
Dept. of Solid State Science, University of Gent, Krijgslaan 281/S 1, B-9000, Gent, Belgium.
F. Cardon
Affiliation:
Dept. of Solid State Science, University of Gent, Krijgslaan 281/S 1, B-9000, Gent, Belgium.
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Abstract

Ultra-thin epitaxial CoSi2 films formed by Co(3∼5nm)/Ti(1 nm)/Si(100) and Co(3∼5nm)/Si(lnm)/Ti(Inm)/Si are studied. The multilayers are deposited by ion-beam sputtering. Rapid thermal annealing (RTA) is used for silicidation. XRD, RBS, TEM, AFM, four-point probe, I-V and C-V measurements are carried out for characterization. The XRD spectra show the CoSi2 film formed by Co/Ti/Si or Co/Si/Ti/Si solid phase epitaxy has, epitaxial characteristic. XTEM shows that the film is continuous. RBS/Channeling shows that the formed CoSi2 has sharp interface with a minimum channeling yield of Co signal of 40%. AFM shows that the surface of ultra-thin CoSi2 film is smooth with a roughness of nearly 0.7 nm. The Rs∼T relationship shows that the CoSi2 films formed by Co/Si/Ti/Si reaction have the best thermal stability (stable up to 900°C). Those formed by Co/Ti/Si reaction are stable up to 850°C, while those formed by Co/Si reaction are only stable up to 750°C. By fitting the experimental I-V and C-V curves of the epitaxial CoSi2/Si Schottky diodes, barrier heights of around 0.6 eV and close to unity ideality factors are obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 564: Symposium N – Advanced Interconnects and Contacts , 1999 , 157
Copyright
Copyright © Materials Research Society 1999

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