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Effect of Carbon on Diffusion of Boron in SiGe between 940 – 1050 °C

Published online by Cambridge University Press:  17 March 2011

Mudith S. A. Karunaratne ,
Janet M. Bonar ,
Jing Zhang  and
Arthur F. W. Willoughby
Mudith S. A. Karunaratne
Affiliation:
Materials Research Group, School of Engineering Sciences andUniversity of Southampton, Highfield, Southampton SO17 1BJ, UK
Janet M. Bonar
Affiliation:
School of Electronics & Computer Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK
Jing Zhang
Affiliation:
Blackett Laboratory, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, UK
Arthur F. W. Willoughby
Affiliation:
Materials Research Group, School of Engineering Sciences andUniversity of Southampton, Highfield, Southampton SO17 1BJ, UK
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Abstract

The effect of carbon on boron diffusion was studied in Si and strained SiGe. Several types B containing matrices were grown: (i) Si, (ii) Si containing 0.1% C peak, (iii) SiGe with 11% Ge and (iv) SiGe with 11% Ge and with a 0.1% C peak, using gas-source molecular beam epitaxy (MBE). The combination of Si, Si with C, SiGe and SiGe with C matrices allowed us to separate the effects of Ge and C on B diffusivity. To ensure non-injection surface conditions, low temperature silicon dioxide (LTO) and silicon nitride layers were deposited on top of samples in that order. These samples were then rapid thermal annealed (RTA) at 940, 1000 and 1050°C in an O2 ambient.

Diffusion coefficients of B in each type of matrix were extracted by computer simulation, using SIMS profiles obtained from samples before and after the RTA treatment. Diffusion coefficient is reduced by both Ge and C, the suppression by C being more profound. The results are compared to and found to be in reasonable agreement with limited data available in literature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 809: Symposium B – High-Mobility Group-IV Materials and Devices , 2004 , B10.2
Copyright
Copyright © Materials Research Society 2004

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