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Diffusion Engineering by Carbon in Silicon

Published online by Cambridge University Press:  17 March 2011

Ulrich Goesele
Affiliation:
Max Plack Institute of Microstructure Physics Weinberg 2, D-06120 Halle, Germany
Pierre Laveant
Affiliation:
Max Plack Institute of Microstructure Physics Weinberg 2, D-06120 Halle, Germany
Rene Scholz
Affiliation:
Max Plack Institute of Microstructure Physics Weinberg 2, D-06120 Halle, Germany
Norbert Engler
Affiliation:
Max Plack Institute of Microstructure Physics Weinberg 2, D-06120 Halle, Germany
Peter Werner
Affiliation:
Max Plack Institute of Microstructure Physics Weinberg 2, D-06120 Halle, Germany
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Abstract

The possibility to suppress undesirable diffusion of the base dopant boron in siliconbased bipolar transistor structures by the incorporation of a high concentration of carbon has lead to renewed interest in the behavior of carbon in crystalline silicon. The present paper will review essential features of carbon in silicon including solubility, diffusion mechanisms and precipitation behavior. Based on this information the possibilities to use carbon to influence diffusion of dopants in silicon by the introduction of non-equilibrium concentrations of intrinsic point defects will be discussed as well as the reason for the relatively high resilience against carbon precipitation. Interactions between carbon and oxygen will be mentioned, especially in the context of an as yet unexplained fast out-diffusion of carbon close to the surface.

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