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Damage and strain in epitaxial GexSi1–x films irradiated with Si

Lie, D. Y. C. and Vantomme, A. and Eisen, F. and Vreeland, T., Jr. and Nicolet, M.-A. and Carns, T. K. and Arbet-Engels, V. and Wang, K. L. (1993) Damage and strain in epitaxial GexSi1–x films irradiated with Si. Journal of Applied Physics, 74 (10). pp. 6039-6045. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:LIEjap93

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Abstract

The damage and strain induced by irradiation of both relaxed and pseudomorphic GexSi1–x films on Si(100) with 100 keV 28Si ions at room temperature have been studied by MeV 4He channeling spectrometry and x-ray double-crystal diffractometry. The ion energy was chosen to confine the major damage to the films. The results are compared with experiments for room temprature Si irradiation of Si(100) and Ge(100). The maximum relative damage created in low-Ge content films studied here (x=10%, 13%, 15%, 20%, and 22%) is considerably higher than the values obtained by interpolating between the results for relative damage in Si-irradiated single crystal Si and Ge. This, together with other facts, indicates that a relatively small fraction of Ge in Si has a significant stabilizing effect on the retained damage generated by room-temperature irradiation with Si ions. The damage induced by irradiation produces positive perpendicular strain in GexSi1–x, which superimposes on the intrinsic positive perpendicular strain of the pseudomorphic or partially relaxed films. In all of the cases studied here, the induced maximum perpendicular strain and the maximum relative damage initially increase slowly with the dose, but start to rise at an accelerated rate above a threshold value of ~0.15% and 15%, respectively, until the samples are amorphized. The pre-existing pseudomorphic strain in the GexSi1–x film does not significantly influence the maximum relative damage created by Si ion irradiation for all doses and x values. The relationship between the induced maximum perpendicular strain and the maximum relative damage differs from that found in bulk Si(100) and Ge(100).


Item Type:Article
Additional Information:Copyright © 1993 American Institute of Physics. Received 3 May 1993; accepted 28 July 1993. This work was supported by the Semiconductor Research Corporation under a coordinated research program at Caltech and at UCLA, contract no. 93-SJ-100. D. Y. C. Lie would like to express deep appreciation to Dr. Hollander at ISI, Jiilich, Germany for providing the x=0.22 sample. The authors would also like to thank Dr. C. J. Tsai and Dr. G. Bai for providing the simulation programs; Dr. T. Workman, R. Gorris, M. Easterbrook for help in maintaining and repairing equipment, and Professor W. L. Johnson, Professor T. Christman, and Dr. M. Li for illuminating discussions.
Subject Keywords:GERMANIUM SILICIDES; THIN FILMS; EPITAXIAL LAYERS; PHYSICAL RADIATION EFFECTS; SILICON IONS; KEV RANGE 100–1000; ION CHANNELING; XRD; DAMAGE; STRAINS; AMORPHIZATION
Record Number:CaltechAUTHORS:LIEjap93
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LIEjap93
Alternative URL:http://dx.doi.org/10.1063/1.355219
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4167
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Aug 2006
Last Modified:26 Dec 2012 08:58

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