Chemical Reaction Mechanisms for Modeling the Fluorocarbon Plasma Etch of Silicon Oxide and Related Materials

HO,PAULINE ; JOHANNES,JUSTINE E. ; BUSS,RICHARD J. ; MEEKS,ELLEN

Sandia National Laboratories

关键词: Chemical Reactions;    Dielectric Materials;    Experimental Reactors;    Etching;    36 Materials Science;   

DOI  :  10.2172/782704
RP-ID  :  SAND2001-1292
RP-ID  :  AC04-94AL85000
RP-ID  :  782704

美国|英语

来源: UNT Digital Library

【 摘 要 】

As part of a project with SEMATECH, detailed chemical reaction mechanisms have been developed that describe the gas-phase and surface chemistry occurring during the fluorocarbon plasma etching of silicon dioxide and related materials. The fluorocarbons examined are C{sub 2}F{sub 6}, CHF{sub 3} and C{sub 4}F{sub 8}, while the materials studied are silicon dioxide, silicon, photoresist, and silica-based low-k dielectrics. These systems were examined at different levels, ranging from in-depth treatment of C{sub 2}F{sub 6} plasma etch of oxide, to a fairly cursory examination of C{sub 4}F{sub 8} etch of the low-k dielectric. Simulations using these reaction mechanisms and AURORA, a zero-dimensional model, compare favorably with etch rates measured in three different experimental reactors, plus extensive diagnostic absolute density measurements of electron and negative ions, relative density measurements of CF, CF{sub 2}, SiF and SiF{sub 2} radicals, ion current densities, and mass spectrometric measurements of relative ion densities.