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Direct Imaging of “Explosively” Propagating Buried Molten Layers In Amorphous Silicon Using Optical, Tem And Ion Backscattering Measurements*

Published online by Cambridge University Press:  26 February 2011

D. H. Lowndes ,
G. E. Jellison Jr ,
S. J. Pennycook ,
S. P. Withrow ,
D. N. Mashburn  and
R. F. Wood
D. H. Lowndes
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
G. E. Jellison Jr
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
S. J. Pennycook
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
S. P. Withrow
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
D. N. Mashburn
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. F. Wood
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The behavior of pulsed laser-induced “explosively” propagating buried molten layers (BL) in ion implantation-amorphized silicon has been studied in a time- and spatially-resolved way, using nanosecond time-resolved reflectivity measurements, “Z-contrast” scanning transmission electron microscope (STEM) imaging of implanted Cu ions transported by the BL, and helium ion backscattering measurements. Infrared (1152 nm) reflectivity measurements allow the initial formation and subsequent motion of the BL to be followed continuously in time. The BL velocity is found to be a function of both its depth below the surface and of the incident KrF laser energy density (El); a maximum velocity of about 14 m/s is observed, implying an undercoolingvelocity relationship of about 14 K/(m/s). Z-contrast STEM measurements show that the final BL thickness is less than 15 nm. Time-resolved optical, TEM and ion backscattering measurements of the final BL depth, as a function of E1, are also found to be in excellent agreement with one another.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 51: Symposium A – Beam-Solid Interactions and Phase Transformations , 1985 , 131
Copyright
Copyright © Materials Research Society 1985

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Footnotes

*

Research sponsored by the Division of Materials Sciences, U.S. Department of Energy, under Contract No. DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

References

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