PLASMA AND ULTRA VIOLET DAMAGE IN OXYGEN PHOTORESIST STRIPPING WITH A DOWNSTREAM MICROWAVE PLASMA SOURCE

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$50,000.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
14266
Agency Tracking Number:
14266
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
35 Cabot Road, Woburn, MA, 01801
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr. Richard S. Post
President
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
THE GOAL OF THIS PROGRAM IS TO INVESTIGATE THE CAUSES OF SEMICONDUCTOR WAFER DAMAGE DURING OXYGEN PHOTORESIST STRIPPING WITH A DOWNSTREAM MICROWAVE PLASMA. THE USE OF OXYGEN PLASMAS FOR DRY STRIPPING OF PHOTORESIST ELIMINATES THE HANDLING, DISPOSAL, AND RESIST DEGRADATION PROBLEMS ASSOCIATED WITH LIQUID PROCESSES. A DOWNSTREAM, MICROWAVE-PRODUCED PLASMA HAS THE ADDITIONAL ADVANTAGES OF NO ELECTRODE CONTAMINATION AND LOW PLASMA POTENTIALS. HOWEVER, AS WITH OTHER PLASMA ETCHING METHODS, DOWNSTREAM MICROWAVE PROCESSING IS ASSOCIATED WITH WAFER DAMAGE INCLUDING MOBILE ION CONTAMINATION AND ELECTROSTATIC BREAKDOWN OF OXIDE GATES, WALL-SOURCED CONTAMINATION, AND DEGRADATION FROM CHEMICAL OR STRUCTURAL CHANGES. THE CAUSESOF SUCH SURFACE DAMAGE ARE NOT WELL UNDERSTOOD. WE PROPOSE TO CORRELATE SUCH DAMAGE WITH PLASMA SOURCE PHENOMENA SUCH AS UV RADIATION AND SURFACE CHARGING. DURINGPHASE I, WE WILL MAKE RADIAL AND AXIAL SCANS OF PLASMA DENSITY, ELECTRON TEMPERATURE, AND SPACE POTENTIAL IN THE VICINITY OF THE WAFER WHILE MONITORING NEUTRAL GAS CONSTITUENTS FOR A RANGE OF STRIPPING RATES AND PLASMA SOURCE OPERATING POINTS. FOR PHASE II, ON THE BASIS OF CV CURVE SHIFT ANALYSES WE WILL CORRELATE DAMAGE WITH PLASMA ASSOCIATED PHENOMENA SUCH AS UV, SURFACE CHARGING, SYNERGISTIC EFFECTS, AND WALL-SOURCED CONTAMINANTS AND DEVELOP MEANS OF EFFECTIVELY CURTAILING THEM.

* information listed above is at the time of submission.

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