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Lowering the formation temperature of the C54-TiSi2 phase using a metallic interfacial layer

Published online by Cambridge University Press:  31 January 2011

C. Cabral Jr. ,
L. A. Clevenger ,
J. M. E. Harper ,
F. M. d'Heurle ,
R. A. Roy ,
K. L. Saenger ,
G. L. Miles  and
R. W. Mann
C. Cabral Jr.
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
L. A. Clevenger
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
J. M. E. Harper
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
F. M. d'Heurle
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
R. A. Roy
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
K. L. Saenger
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, New York 10598
G. L. Miles
Affiliation:
IBM Microelectronics, Essex Junction, Vermont 05452
R. W. Mann
Affiliation:
IBM Microelectronics, Essex Junction, Vermont 05452
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Abstract

We demonstrate that the formation temperature of the C54 TiSi2 phase from the bilayer reaction of Ti on Si is lowered by approximately 100 °C by placing an interfacial layer of Mo or W between Ti and Si. Upon annealing above 500 °C, the C49 TiSi2 phase forms first, as in the reaction of Ti directly on Si. However, the temperature range over which the C49 phase is stable is decreased by approximately 100 °C, allowing C54 TiSi2 formation below 700 °C. Patterned submicron lines (0.25−1.0 μm wide) fabricated without the Mo layer contain only the C49 TiSi2 phase after annealing to 700 °C for 30 s. With a Mo layer less than 3 nm thick between Ti and Si, however, a mixture of C49 and C54 TiSi2 was formed, resulting in a lower resistivity. The enhanced formation of the C54 TiSi2 is attributed to an increased density of nucleation sites for the C49-C54 phase transformation, arising from a finer grained precursor C49 phase.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 304 - 307
Copyright
Copyright © Materials Research Society 1997

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