LAM 716-443083-004 Top Confinement Ring

1. Product Description

716-443083-004 is an OEM Top Confinement Ring proprietary to Lam Research ICP plasma etching chambers for 300mm wafer production. It is a core annular hardware installed directly beneath the upper gas inlet ring (716-443090-002) inside the vacuum process cavity, acting as a physical boundary to constrain plasma distribution within the wafer processing zone.

• Fabricated from high-purity plasma-resistant ceramic composite with precision machined inner/outer profiles, engineered to withstand continuous bombardment of fluorine, chlorine-based reactive plasma chemistries.
• Features integrated radial flow channels and gap control lands to precisely regulate exhaust gas flow and confine plasma to the wafer surface area, preventing plasma leakage toward chamber sidewalls.
• Precision alignment notches and flat sealing surfaces for repeatable positioning and vacuum sealing when mated with upper gas distribution assemblies and chamber liner components.
• Uniform thermal expansion properties to maintain consistent confinement gaps under repeated thermal cycling between room temperature and high process operating temperatures.
• Surface treated with dense anti-sputtering coating to minimize material erosion, particle generation and polymer deposition during long production campaigns.

• Compatible with Lam Versys, Exelan and Rainbow series dielectric/conductor etch platforms, matched with 716-443090-002 upper gas inlet ring as a complete gas-plasma confinement assembly.

  
  

2. Core Product Functions

• Plasma Confinement & Boundary Control: Forms a defined reaction boundary to trap plasma directly above the silicon wafer, suppress lateral plasma diffusion to chamber liners, and eliminate parasitic sidewall etching that degrades wafer uniformity.
• Uniform Exhaust Gas Regulation: Tuned peripheral gap geometry balances gas pumping velocity across the wafer radius, eliminating center-edge pressure gradients that cause etch rate skew and micro-loading defects.
• Process Chemistry Isolation: Separates the high-density plasma reaction zone from cold chamber liner surfaces, preventing premature condensation of reactive precursor gases and polymer particle accumulation.
• RF Plasma Stability Optimization: Acts as a dielectric confinement barrier to homogenize RF electric field distribution, reducing localized plasma arcing and unstable ignition events during recipe switching.
• Wafer Edge Profile Tuning: Precisely controls plasma density at the wafer perimeter to optimize edge etch profile, eliminating edge rounding or trench depth offset between wafer center and edge.
• Extended Chamber PM Cycle Support: Resists rapid plasma erosion to stabilize process performance for hundreds of production batches, reducing frequent chamber disassembly and maintenance downtime.

3. Typical Application Scenarios

• Lam Research inductively coupled plasma (ICP) etch chambers for advanced node 300mm logic, memory and power semiconductor wafer manufacturing.
• High-aspect ratio dielectric etching, metal gate conductor etching and shallow trench isolation (STI) process chambers requiring strict plasma uniformity control.
• Semiconductor cleanroom mass production fabs with continuous high-volume wafer batch processing under high RF power plasma operating conditions.
• Chamber preventive maintenance (PM) spare part replacement to restore plasma confinement performance after long-term plasma exposure and coating degradation.
• Paired assembly with 716-443090-002 upper gas inlet ring to form a complete gas delivery and plasma confinement system inside Lam etch process cavities.

4. Common Issues & Troubleshooting