Slurry Pump Affects on Distribution and Point of Use CMP Systems 2/16/06. Levitronix User s Group Presentation
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1 Slurry Pump Affects on Distribution and Point of Use CMP Systems 2/16/06 Levitronix User s Group Presentation Rob Donis, Process Engineer, LSI Logic Leland Bauck, Application Engineer, Levitronix
2 Project Goals A Comparison Study Between Two Slurry Distribution Pump Types Slurry Particle Performance in Bulk Supply System Bellows Pump Performance Levitronix BPS3 Performance Point of Use Slurry Pump Systems Peristaltic Pumps vs. Levitronix BPS1 System Oxide Novellus 200mm Momentum CMP Copper AMAT MirraMesa 200mm CMP Corp Template. 2 LSI Logic 2003
3 Agenda Part 1 Distribution Pump Systems Bellows Pump Distribution Configuration Levitronix Distribution Configuration Large Particle Data Slurry Delivery System Particle Data Filter Efficiency Corp Template. 3 LSI Logic 2003
4 Agenda Part 2 Point of Use Pump Sytems Peristaltic Pumps vs. BPS1 Pressure Affects on Peristaltic Pumps Novellus Momentum Study Peristaltic Pump Linearity Uniformity & MRR Curves Discussion AMAT MirraMesa Study Peristaltic Pump Linearity Uniformity & MRR Curves Discussion Corp Template. 4 LSI Logic 2003
5 Part 1 Distribution Pump Systems Corp Template. 5 LSI Logic 2003
6 Bellows Pump Distribution Configuration From Blending System Polisher x Point of Use Slurry Pumps Polish Heads Polisher 5 Polisher 4 Polisher 3 Recirculation Slurry Distribution System Bellows Pump Loop Filtration System Polisher 2 Polisher 1 Corp Template. 6 LSI Logic 2003
7 Levitronix Distribution Configuration Polisher 5 From Blending System Polisher x Point of Use Slurry Pumps Polish Heads Polisher 4 Polisher 3 Polisher 2 Recirculation Slurry Distribution System Loop Filtration System Levitronix Pump Polisher 1 Corp Template. 7 LSI Logic 2003
8 Slurry Delivery System Large Particle Data Slurry Distribution Particle Performance Corp Template. 8 LSI Logic 2003
9 Slurry Delivery System Particle Data Slurry Distribution Particle Performance Corp Template. 9 LSI Logic 2003
10 Filter Efficiency Bellows Pump vs. Levitronix BPS3 Corp Template. 10 LSI Logic 2003
11 Part 2 Point of Use Pump Systems Corp Template. 11 LSI Logic 2003
12 Peristaltic Pumps Benefits Simple Design Self Priming Proven System Disadvantages Flow Surging Tubing Particles Shed Into Slurry Stream, Causing Wafer Scratches High Maintenance Requires Frequent Recalibrations Output Flow Dependant on Input Pressure Requires Expensive Consumable Pump Tubing Corp Template. 12 LSI Logic 2003
13 BPS1 Closed Loop Flow Control System Benefits Increased Process Flow Rate Accuracy Process Flow Rates Independent of Loop Filter Loading Process Flow Rates Independent of Distribution Slurry Demand Constant Pressure Lower Maintenance Decreased Downtime Eliminates a Consumable Item Eliminates Tubing Particle Shedding Into Slurry Stream Increased Filter Lifetime Disadvantages Increases System Complexity Not Self Priming Corp Template. 13 LSI Logic 2003
14 Peristaltic Pumps vs. BPS1 Peristaltic Pump System Levitronix Closed Loop Flow Control Pump System Corp Template. 14 LSI Logic 2003
15 Pressure Affects on Peristaltic Pumps Peristaltic Pump variability caused by pressure fluctuations Flow rates change in response to supply pressure fluctuations Filter Loading changes input pressure System Loading caused by Slurry Demand 10.9PSI 10.9PSI 100mL Comparison 9.7 PSI 200mL Comparison 1.2PSI Drop ~ 4% Flow Rate Difference 9.7 PSI Corp Template. 15 LSI Logic 2003
16 Novellus Momentum Closed Loop Flow Control Corp Template. 16 LSI Logic 2003
17 Peristaltic Pump Linearity Commanded Flow Rate vs. Actual Flow Rate 2-Point Calibrated Peristaltic Pump System Corp Template. 17 LSI Logic 2003
18 Uniformity & MRR Curves Peristaltic Pump Removal Rate / Uniformity Curves Corp Template. 18 LSI Logic 2003
19 Uniformity & MRR Curves BPS1 Pump Removal Rate / Uniformity Curves Corp Template. 19 LSI Logic 2003
20 Peristaltic Pumps vs. BPS1 Oxide Removal Rate / Uniformity Curves Uniformity Divergence Under 80mL/min Corp Template. 20 LSI Logic 2003
21 Discussion Uniformity Theory Slurry flow surging causes variable spatial distributions between the wafer surface, polish pad, and polish particles. Flow accuracies of both pump systems are accurate. The most significant difference is flow surging. Wafer Wafer Polish Pad Slurry Particles Polish Pad Slurry Particles Corp Template. 21 LSI Logic 2003
22 AMAT MirraMesa Closed Loop Flow Control Corp Template. 22 LSI Logic 2003
23 Peristaltic Pump Linearity Commanded Flow Rate vs. Actual Flow Rate 7-Point Calibrated Peristaltic Pump System Corp Template. 23 LSI Logic 2003
24 Uniformity & MRR Curves Copper Removal Rate / Uniformity Curves Removal Rate Divergence Under 75 ml/min Corp Template. 24 LSI Logic 2003
25 Uniformity & MRR Curves Barrier Removal Rate / Uniformity Curves Uniformity Divergence under 100mL/min Corp Template. 25 LSI Logic 2003
26 Discussion Uniformity / MRR Theory MRR and NU divergences occur at low slurry flow rates. Slurry flow rate is a major variable for removal rate. Below 80 ml/min, the peristaltic pump does not supply the process a constant slurry flow to keep the process stable. Peristaltic Pump Rotation Angle vs. Flow Rate ml/min Example Flow Rate Pump Rotation Angle MRR and NU divergences are the result. Corp Template. 26 LSI Logic 2003
27 Conclusion Reduction of large particles in oxide slurry supply system can be achieved with the Levitronix Pump. The BPS3 distribution pump tested reduced 800nm particles by 28 percent. Particles 1 micron and greater were reduced by 50% or better. Slurry filter efficiency improves with the Levitronix pump. Levitronix POU slurry delivery system eliminates flow surging caused by peristaltic pumps. Levitronix BPS1 POU pumps show an improvement in MRR and NU flow rates below 80 ml/min. Corp Template. 27 LSI Logic 2003
28 Acknowledgements Benno Milmore, Process Engineer, LSI Logic Manufacturing Services, Inc. Reto Schoeb, CEO, Levitronix Rob Stitz, Controls Engineer, Levitronix. Gary Rawson, Technologies North America. Corp Template. 28 LSI Logic 2003
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