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Nucleation processes in Si cvd on ultrathin SiO_2 layers

机译:SiO_2超薄SiO2层中Si CVD的成核过程

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We investigate nucleation densities in UHV-CVD of Si on ultrathin SiO_2 layers (0.2-2 nm) which were prepared by three different oxidation methods: thermal, UV-ozone, and plasma oxidation. The experiments changing the Si_2H_6 pressure in UHV-CVD indicate that these oxide surfaces have preferred sites for nucleation. Among the three oxidation methods, the nucleation density, N_s, on the thermal oxide is the lowest, while the plasma oxide shows the highest N_s. These results suggest that strained bonds and ion-induced damages in the oxide layers assist nucleation. For UV-ozone and plasma oxides N_s is independent of orientation, reconstruction, and morphology of the initial Si surface.
机译:我们研究了在超薄SiO_2层(0.2-2 nm)上Si的UHV-CVD中的成核密度,该超薄SiO_2层是通过三种不同的氧化方法制备的:热,紫外臭氧和等离子体氧化。在UHV-CVD中改变Si_2H_6压力的实验表明,这些氧化物表面具有优选的成核位点。在这三种氧化方法中,热氧化物上的成核密度N_s最低,而等离子氧化物显示出最高的N_s。这些结果表明,在氧化物层中的应变键和离子诱导的损伤有助于成核。对于紫外线臭氧和等离子体氧化物,N_s与初始Si表面的取向,重建和形态无关。

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