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Real-space strain mapping of SOI features using microbeam X-ray diffraction

Published online by Cambridge University Press:  29 February 2012

Conal E. Murray ,
S. M. Polvino ,
I. C. Noyan ,
B. Lai  and
Z. Cai
Conal E. Murray*
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, New York 10598
S. M. Polvino
Affiliation:
Department of Applied Physics and Mathematics, Columbia University, New York, New York 10027
I. C. Noyan
Affiliation:
Department of Applied Physics and Mathematics, Columbia University, New York, New York 10027
B. Lai
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
Z. Cai
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
*
a)Author to whom correspondence should be addressed. Electronic mail: conal@us.ibm.com
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Abstract

Synchrotron-based X-ray microbeam measurements were performed on silicon-on-insulator (SOI) features strained by adjacent shallow-trench isolation (STI). Strain engineering in microelectronic technology represents an important aspect of the enhancement in complementary metal-oxide semiconductor device performance. Because of the complexity of the composite geometry associated with microelectronic circuitry, characterization of the strained Si devices at a submicron resolution is necessary to verify the expected strain distributions. The interaction region of the SOI strain extended the SOI film thickness from the STI edge at least 25 times. Regions of 65-nm-thick SOI less than 3 μm wide exhibited an overlap in the strain fields because of the surrounding STI. Microbeam mapping of arrays containing submicron SOI features and embedded STI structures revealed the largest out-of-plane strains because of the close proximity of superimposed strain distributions induced by the STI.

Keywords

stressstrainsilicon-on-insulatorX-ray diffractionsynchrotron microbeam
Type
X-Ray Diffraction
Information
Powder Diffraction , Volume 23 , Issue 2 , June 2008 , pp. 106 - 108
Copyright
Copyright © Cambridge University Press 2008

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