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Defect Reduction and Defect Engineering in Silicon-on-Sapphire Material Using Ge Implantation

Published online by Cambridge University Press:  26 February 2011

F. Namavar ,
E. Cortesi ,
N. M. Kalkhoran ,
J. M. Manke  and
B. L. Buchanan
F. Namavar
Affiliation:
Spire Corporation, Patriot’s Park, Bedford MA, 01730
E. Cortesi
Affiliation:
Spire Corporation, Patriot’s Park, Bedford MA, 01730
N. M. Kalkhoran
Affiliation:
Spire Corporation, Patriot’s Park, Bedford MA, 01730
J. M. Manke
Affiliation:
Spire Corporation, Patriot’s Park, Bedford MA, 01730
B. L. Buchanan
Affiliation:
Spire Corporation, Patriot’s Park, Bedford MA, 01730
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Abstract

Substantial reduction of defect density in silicon-on-sapphire (SOS) material is required to broaden its range of applications to include CMOS and bipolar devices. In recent years, solid phase epitaxy and regrowth (SPEAR) and double solid phase epitaxy (DSPE) processes were applied to SOS to reduce the density of defects in the silicon. These methods result in improved carrier mobilities, but also in increased leakage current, even before irradiation. In a radiation environment, this material has a large increase in radiation induced back channel leakage current as compared to standard wafers. In other words, the radiation hardness quality of the SOS declines when the crystalline quality of the Si near the sapphire interface is improved.

In this paper, we will demonstrate that Ge implantation, rather than Si implantation normally employed in DSPE and SPEAR processes, is an efficient and more effective way to reduce the density of defects near the surface silicon region without improving the Si/sapphire interface region. Ge implantation may be used to engineer defects in the Si/sapphire interface region to eliminate back channel leakage problems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 201: Symposium A – Surface Chemistry and Beam-Solid Interactions , 1990 , 337
Copyright
Copyright © Materials Research Society 1991

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