K. Takechi and M. A. Lieberman

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Presentation transcript:

K. Takechi and M. A. Lieberman Photoresist Etching with Oxygen Plasma in Large Area Plasma Source (LAPS) SFR Workshop November 8, 2000 K. Takechi and M. A. Lieberman Berkeley, CA 2001 GOAL: Etch photoresist in the LAPS to examine process uniformity by 9/30/2001. 11/8/00

Experimental LAPS Setup Antenna coil embedded in the plasma Eight quartz tubes threaded by copper antenna tubes 36.0 cm x 46.5 cm processing area Plasma Voltage sensor Rs Xm(0.5uH) D X1 900 pF (fixed) 12- 1000 pF New series-parallel system configuration Vrf C Bm1 B Bm2 12- 500 pF X2 A 11/8/00

Oxygen Discharge Model Substrate holder metal (Center of the chamber) (cm) 5 Side metal Calculation area B.C. Vn=0 r1 r2 ….. r8 -5 -15 R Quartz 15 (cm) Chamber geometry used in the model Particle balance : Power balance : 11/8/00

Ion flux profiles at substrate surface for various gas pressures (simulation results) 11/8/00

O-atom flux profiles lost to substrate surface for various gas pressures (simulation results) 11/8/00

Photoresist Etch Model E.R. : Etch rate ji : Ion current density at substrate surface pO : O-atom pressure at substrate surface kref : Ion-induced desorption rate constant at Vbias= 0 V Plots of etch rate vs. pressure for various rf powers. The fits are from the above equation with simulation results. 11/8/00

Effect of applying a substrate bias on etch rate and uniformity Applying a Vbias leads to increase in both etch rate and uniformity over the processing area. Etch rate profiles at a gas pressure of 5 mTorr at Vbias= 0 V and Vbias= -80 V 11/8/00

Predicted etch rate profiles at a gas pressure of 5 mTorr at k(Vbias)/kref=1 and k(-80V)/kref=4 Simulation results support the experimental data, with increase in the etch rate and uniformity with applying a bias. 11/8/00

2002 and 2003 Goals Modeling silane deposition processes in LAPS, by 9/30/2002. Modeling reduced electron temperature and density processing plasmas in LAPS, by 9/30/2003. 11/8/00