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Retarded diffusion of boron in Si due to the formation of an epitaxial CoSi_2 layer

机译:由于外延CoSi_2层的形成,硼在Si中的扩散缓慢

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The diffusion of boron in silicon with and without a 20-nm thick epitaxial CoSi_2 layer was investigated by secondary ion mass spectro-metry (SIMS) using doping superlattices (DSLs). For specimens without CoSi_2 layer, we observed oxidation enhanced diffusion (OED) of B in Si in accordance with the literature. However, B diffusion in silicide capped specimens was found to be retarded by about a factor of 20 as compared to specimens without a silicide layer. The measured diffusivity was even less than the intrinsic thermal diffusivity of B in Si.
机译:通过使用掺杂超晶格(DSLs)的二次离子质谱(SIMS)研究了具有和不具有20nm厚外延CoSi_2层的硼在硅中的扩散。对于没有CoSi_2层的样品,我们根据文献观察到B在Si中的氧化增强扩散(OED)。然而,与没有硅化物层的样品相比,发现在硅化物覆盖的样品中B扩散被抑制了约20倍。测得的扩散率甚至小于B在Si中的固有热扩散率。

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