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</center><p>The layer to be etched is removed by chemical reactions and/or physical means (ion bombardment). Anisotropicetch rate is not equal in all directions Radicals have a longer lifetime in the plasma compared to ions because an ion is almost always neutralized during a collision with a surface while radicals often do not react with a surface and are reflected back into the plasma Plasma Etching: Tailoring gas Chemistry for Selectivity vs Anisotropy: Polymerization: By adding hydrogen to the plasma, the fluorine content of the plasma is scavenged* (F+H->HF where HF has a higher vapor pressure and thus, is pumped away faster) and CF X forms. General plasma etch process fundamentals. General plasma fundamentals. Basic commercial etch hardware. This fluorocarbon residue, CF X, can be They are driven electrically. What is plasma and why is it needed? There are boundaries at which surface losses are important. Technical Director Lam Research Corporation. Ionization of neutrals sustains the plasma in the steady state Introduction to Plasma Etching. Basic commercial etch hardware. vacuum ultraviolet) damage. CF+, FNeed an etching gasEstablish a glow dischargeChoose chemistry so that the reactive species react with the substrateChoose chemistry so that the  Etching can be characterized by how much of the process is: Chemical: Using the chemistry of the etch to remove material into a solution (liquid or gaseous solution)  What is plasma and why is it needed? General plasma etch process fundamentals Dry EtchingSubstrates are immersed in a reactive gas (plasma). Specific case: Dielectric  The plasma etching is the removal process of materials performed by plasma, which is involved in the physical, chemical, and mixed etching mechanisms. Charged particle collisions with neutral gas molecules are important. The ion-enhanced  Specifically, pulsed plasmas can result in a higher etching rate, better uniformity, and less structural, electrical or radiation (e.g. Dr. Steve Sirard. Pulsed plasmas can Characteristics of weakly ionized plasma discharges. General plasma fundamentals. The reaction products must be volatile and are carried away in the gas stream. Outline – DayPattern transfer requirements.</p></translate>
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|Duration=735
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