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• W2056776939 abstract "Dopant atoms can segregate to ${mathrm{SiO}}_{2}/mathrm{Si}(001)$ interfaces and be deactivated there. Using phosphorus as a typical example of a donor and guided by results of ab initio calculations, we present a model of donor segregation. We find that P is trapped at the interface in the form of threefold-coordinated atoms. The atomic detailed configuration and the process of P incorporation depend on P concentration ${C}_{mathrm{P}}$ in the vicinity of the interface. At low ${C}_{mathrm{P}},$ phosphorus atoms prefer to substitute Si atoms with dangling bonds. At high ${C}_{mathrm{P}},$ phosphorus pairs are formed. At intermediate ${C}_{mathrm{P}},$ (around ${10}^{17}--{10}^{19} {mathrm{cm}}^{ensuremath{-}3})$ segregation occurs to sites associated with interface roughness and to interface Si-Si bridges, and is mediated by diffusion and annihilation of Si dangling bonds and by reoxidation during oxide annealing. Making diffusion of dangling bonds more difficult (for example, by nitridation) should, therefore, reduce the trapping efficiency of ${mathrm{SiO}}_{2}/mathrm{Si}(001)$ in the technologically important regime of intermediate ${C}_{mathrm{P}}.$" @default.
• W2056776939 created "2016-06-24" @default.
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• W2056776939 date "2002-05-31" @default.
• W2056776939 modified "2023-10-18" @default.
• W2056776939 title "Mechanism of dopant segregation to<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>SiO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>/</mml:mo><mml:mi mathvariant=normal>Si</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>interfaces" @default.
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• W2056776939 doi "https://doi.org/10.1103/physrevb.65.245305" @default.
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