Peer-Reviewed Journal Details
Mandatory Fields
Dewan, MNA;McNally, PJ;Perova, T;Herbert, PAF
2003
January
Microelectronic Engineering
Determination of SF6 reactive ion etching end point of the SiO2/Si system by plasma impedance monitoring
Published
14 ()
Optional Fields
SILICON DIOXIDE FILMS
65
25
46
Plasma impedance monitoring is successfully used to determine the end point of reactive ion etching of a SiO2 layer lying on a Si substrate in SF6 plasma. The usefulness of this technique is demonstrated using a commercial Plasma Impedance Monitoring (PIM) system. The end point conditions are tested by monitoring changes in the fundamental and the first four harmonic components of the RF current, RF voltage, phase between RF voltage and current, RF discharge power and RF impedance. The best monitoring parameter found in this work is modelled as a polynomial equation of RF input power, chamber pressure and gas flow rate, from which the end point can be predicted with good precision and easily detected by the PIM. The end point conditions are confirmed by both the Fourier Transform Infrared Spectroscopy (FTIR) measurements and via observation of the plasma colour. (C) 2003 Elsevier Science B.V. All rights reserved.
AMSTERDAM
0167-9317
Grant Details