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- W1501868453 abstract "Since processed substrates usually exhibit nonplanar surface structures in microelectro-mechanical-systems (MEMS)etching,a two-dimensional (2D)fluid model is developedto simulate the characteristics of the sheath near a conductive substrate with a circular trench,which is placed in an argon discharge powered by a radio-frequency (RF)current source.Themodel consists of 2D time-dependent fluid equations,the Poisson equation,and a current balanceequation that can self-consistently determine the instantaneous voltage on the substrate placed ona powered electrode.The effects of both the aspect ratio (depth/width)and the structure of thetrench on the characteristics of the sheath are simulated.The time-averaged potential and electricfield in the sheath are calculated and compared for different discharge parameters.The resultsshow that the radial sheath profile is not uniform and always tends to adapt to the contour of thesubstrate,which is believed to be the moulding effect.Affected by the structure of the substratesurface,the potential and electric field near the inner and outer sidewalls of the trench exhibitobvious non-uniformity,which will inevitably lead to non-uniformity in etching,such as notching.Furthermore,with a fixed amphtude of the RF current source,the potential drops and the sheaththickness decrease with an increase in aspect ratio." @default.
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- W1501868453 date "2011-01-01" @default.
- W1501868453 modified "2023-09-24" @default.
- W1501868453 title "Study of Characteristics of the Radio-Frequency Sheath over a Substrate with a Circular Trench" @default.
- W1501868453 hasPublicationYear "2011" @default.
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