Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Mazzola, Michael S.

Committee Member

Koshka, Yaroslav

Committee Member

Williams, John R.

Date of Degree

12-13-2002

Document Type

Graduate Thesis - Open Access

Major

Electrical Engineering

Degree Name

Master of Science

College

College of Engineering

Department

Department of Electrical and Computer Engineering

Abstract

SiC etch development has been performed in a Lam TCP 9400SE II system (a system meant for polysilicon etching and modified for SiC etching). SiC etching has never been reported in this particular system. Various parameters (carrier material, pressure, gas additives, gas flow, and electrode power) were examined and their effects determined on etch rate and resulting surface morphology. An efficient carrier material (graphite), operating pressure (25 mTorr), and gas flow rate (30 sccm) for obtaining peak etch rates were determined for this system. Peak etch rates of 1254 Å/min. in CHF3:O2, 4314 Å/min. in SF6:O2, and 1255 Å/min. in NF3:O2 plasmas were obtained at 25 mTorr with 60%, 20%, and 30% O2 concentrations, respectively, and 1978 Å/min. in a NF3:Ar plasma with 10% Ar concentration. Gas additives were determined to have little or no effect in enhancing the etch rate at low pressures (2 mTorr). The addition of H2 in CHF3 plasmas resulted in severe polymerization when the concentration of H2 was 60% or greater. Increased bottom electrode power resulted in higher etch rates and more anisotropic etch profiles.

URI

https://hdl.handle.net/11668/19143

Comments

SiC||Plasma||VJFET||ICP||Etch

Download

Share

COinS