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Diffusion and Point Defects in Silicon Materials

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Defects and Impurities in Silicon Materials

Part of the book series: Lecture Notes in Physics ((LNP,volume 916))

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Abstract

This chapter aims to provide a basic understanding on the complex diffusion behavior of self-, dopant-, and selected metal atoms in silicon (Si). The complexity of diffusion in Si becomes evident in the shape of self- and foreign-atom diffusion profiles that evolves under specific experimental conditions. Diffusion studies attempt to determine from the diffusion behavior not only the mechanisms of atomic transport but also the type of the point defects involved. This information is of pivotal interest to control the diffusion and activation of dopants during the fabrication of Si-based devices and, from a more fundamental scientific point of view, for comparison to the predictions of theoretical calculations on the properties of point defects in Si. In general, diffusion research relies both on experimental methods to accurately determine diffusion profiles established under well-defined conditions. The analysis of diffusion profiles that can be based on either analytical or numerical solutions of the considered diffusion-reaction equations provides first information about possible diffusion mechanisms. To identify the mechanisms of diffusion, studies under different experimental conditions have to be performed. This chapter on diffusion in Si starts with an introduction on the significance of diffusion research in semiconductors to determine the properties of atomic defects. Diffusion in solids is treated from a phenomenological and atomistic point of view. Experiments designed to investigate the diffusion of self- and foreign atoms are presented and typical self- and foreign-atom profiles obtained after diffusion annealing under specific conditions are illustrated. The mathematical treatment of diffusion-reaction mechanisms is introduced to understand the shape of diffusion profiles and the meaning of the diffusion coefficient deduced from experiments. Modeling of self-, dopant-, and metal-atom diffusion is described that aims at a consistent interpretation of atomic transport processes in Si based on unified properties of the native point defects involved. Finally, till unsolved questions on the properties of point defects in bulk Si and on the diffusion behavior in three-dimensional confined Si structures are addressed.

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    Hartmut Bracht

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    Yutaka Yoshida

  2. Nuclear solid state physics, Katholieke Universiteit Leuven (KU Leuven), Leuven, Belgium

    Guido Langouche

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Bracht, H. (2015). Diffusion and Point Defects in Silicon Materials. In: Yoshida, Y., Langouche, G. (eds) Defects and Impurities in Silicon Materials. Lecture Notes in Physics, vol 916. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55800-2_1

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