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Formation of Buried Epitaxial Si-Ge Alloy Layers in Si <100> Crystal by High Dose Ge ION Implantation

Published online by Cambridge University Press:  28 February 2011

Kin Man Yu ,
Ian G. Brown  and
Seongil Im
Kin Man Yu
Affiliation:
Center for Advanced Materials, Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
Ian G. Brown
Affiliation:
Accelerator & Fusion, Research Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
Seongil Im
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720.
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Abstract

We have synthesized single crystal Si1−xGex alloy layers in Si <100> crystals by high dose Ge ion implantation and solid phase epitaxy. The implantation was performed using the metal vapor vacuum arc (Mevva) ion source. Ge ions at mean energies of 70 and 100 keV and with doses ranging from 1×1016 to to 7×1016 ions/cm2 were implanted into Si <100> crystals at room temperature, resulting in the formation of Si1−xGex alloy layers with peak Ge concentrations of 4 to 13 atomic %. Epitaxial regrowth of the amorphous layers was initiated by thermal annealing at temperatures higher than 500°C. The solid phase epitaxy process, the crystal quality, microstructures, interface morphology and defect structures were characterized by ion channeling and transmission electron microscopy. Compositionally graded single crystal Si1−xGex layers with full width at half maximum ∼100nm were formed under a ∼30nm Si layer after annealing at 600°C for 15 min. A high density of defects was found in the layers as well as in the substrate Si just below the original amorphous/crystalline interface. The concentration of these defects was significantly reduced after annealing at 900°C. The kinetics of the regrowth process, the crystalline quality of the alloy layers, the annealing characteristics of the defects, and the strains due to the lattice mismatch between the alloy and the substrate are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 235: Symposium A – Phase Formation and Modification by Beam-Solid Interactions , 1991 , 293
Copyright
Copyright © Materials Research Society 1992

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References

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