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首页> 外文期刊>Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures >Investigations on the mechanism of silicon etching with chlorine-trifluoride
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Investigations on the mechanism of silicon etching with chlorine-trifluoride

机译:三氟化氯腐蚀硅的机理研究

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We investigated chlorine trifluoride (ClF_3) etching of silicon with a patterned oxide mask layer prepared by e-beam lithography. The mask apertures varied from 0.1 μm to 300 μm. This enables to adjust the flow rate of ClF_3 molecules into the etched cavity leading to a strong variation of the ClF_3 abundance at the silicon surface. A crucial dependence of the etch rate on the aperture area was observed revealing a maximum of the etch rate for a specific ClF_3 abundance. A physical description of the etch process is developed in order to distinguish between different mechanisms within the etching process. At low ClF_3 abundance the etch rate is limited due to a lack of ClF_3. For high abundance the etch rate is assumed to be hampered by a diffusion like transport of ClF_3 molecules through a fluorosilyl layer formed on the silicon surface. It can be shown that the etch rate of silicon with ClF_3 is not limited by the chemical reaction at high ClF_3 abundance. Additionally, we observed a change in etching behavior from isotropic to anisotropic with a strong correlation to the etching regime.
机译:我们研究了通过电子束光刻制备的图案化氧化物掩模层对硅进行的三氟化氯(ClF_3)蚀刻。掩模孔径在0.1μm至300μm之间变化。这使得能够调节ClF_3分子进入蚀刻腔的流速,从而导致硅表面ClF_3丰度的强烈变化。观察到蚀刻速率对孔径面积的关键依赖性,揭示了对于特定的ClF_3丰度的蚀刻速率的最大值。开发了蚀刻工艺的物理描述,以区分蚀刻工艺中的不同机制。在低ClF_3丰度的情况下,由于缺少ClF_3,蚀刻速率受到限制。对于高丰度,假定蚀刻速率受到ClF_3分子通过形成在硅表面上的氟甲硅烷基层的传输之类的扩散的阻碍。可以看出,具有ClF_3的硅的蚀刻速率不受高ClF_3丰度下的化学反应的限制。此外,我们观察到蚀刻行为从各向同性变为各向异性的变化,与蚀刻方式有很强的相关性。

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