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Diffusion and solubility of zinc in dislocation-free and plastically deformed silicon crystals

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Abstract

Floating-zone Si crystals enclosed in quartz ampoules were exposed to Zn vapour released by an elemental diffusion source. Penetration profiles of Zn in Si were recorded using the spreading-resistance technique or neutron activation analysis. Both the erfc-type distributions observed in plastically deformed specimens and the non-erfc profiles determined on dislocationfree wafers are consistently interpreted within the framework of the kick-out model. As an implication, Si self-interstitials generated in excess by interstitial-to-substitutional transitions of in-diffusing Zn atoms annihilate not only at the surface but also at dislocations. On the other hand, dislocation-induced segregation of Zn appears to be rather minor, as revealed by transition electron microscopy. Combining the Zn incorporation rate in dislocation-free Si with solubility data from saturated specimens yields the self-interstitial contribution to the Si self-diffusion coefficient.

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Dedicated to H.J. Queisser on the occasion of his 60th birthday

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Grünebaum, D., Czekalla, T., Stolwijk, N.A. et al. Diffusion and solubility of zinc in dislocation-free and plastically deformed silicon crystals. Appl. Phys. A 53, 65–74 (1991). https://doi.org/10.1007/BF00323437

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