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The Silicon Protection Ring (TE GND Flat) is a high-purity silicon consumable that sits within the upper-electrode region of a Tokyo Electron 300 mm plasma etch chamber. Designated in TEL nomenclature as a protection ring with a top-electrode ground function and a flat reference profile, it encircles and shields the periphery of the upper-electrode assembly while simultaneously providing a defined silicon ground path that anchors the plasma at the top of the discharge volume. It is a sacrificial, plasma-facing part, which is why it carries its own OEM part number (3D87-052882-12) and is scheduled as a routine wet-clean and replacement item rather than a permanent chamber fixture.
Within the chamber stack, the ring occupies the boundary between the active electrode surface and the surrounding grounded hardware. Its “TE GND” designation indicates that the silicon body is referenced to chamber ground at the top of the discharge, so it forms part of the symmetrical RF return geometry that balances the sheath between upper and lower electrodes. The “flat” feature in the name refers to the part’s flat seating and reference face, which controls how the ring locates against the electrode carrier and how cleanly it presents a continuous silicon surface to the plasma.
Because it is both an electrical and a mechanical boundary part, its condition has a direct and measurable effect on etch symmetry, particle counts and the stability of the upper-electrode sheath. As the silicon erodes, the chamber’s effective ground area and surface chemistry drift, which is why fabs treat this ring as a controlled consumable with a defined replacement interval.
The ring performs several overlapping duties at the top of the discharge, combining mechanical protection of the electrode assembly with a precise electrical and plasma-shaping function:
The ring is machined from high-purity silicon chosen for its predictable behaviour under fluorine- and oxygen-bearing etch chemistries. High resistivity and low trace-metal content matter because the surface is continuously sputtered and partially consumed; only a clean silicon source keeps the etch by-products and chamber wall films consistent wafer to wafer.
Beyond purity, the part’s value lies in its dimensional accuracy. The flat seating face and the plasma-facing surface are machined to tight flatness and finish targets so the ring seats repeatably against the electrode carrier and presents a uniform surface to the discharge.
Although it is a peripheral part, the protection ring’s state propagates directly into the metrics fabs care about most. A worn, contaminated or poorly seated ring shifts the ground reference and the edge plasma field, producing effects that are easy to mistake for process drift elsewhere in the recipe:
Continuous ion bombardment gradually sputters the silicon, thinning the plasma-facing surface and rounding sharp edges. As material is lost, the effective ground area and electrode-to-plasma spacing change, shifting the etch profile at the wafer edge and ultimately defining the end of the ring’s useful life.
Silicon is brittle, so thermal cycling, mishandling during installation or stress concentrations at the flat seating face can initiate cracks or chips. Once a crack forms, localised heating and flaking accelerate, releasing particles into the chamber and risking catastrophic fracture during a subsequent cycle.
Polymer and by-product films accumulate on the ring between cleans. If these films build up unevenly or bridge the seating face, the top-electrode ground reference becomes inconsistent, causing impedance drift, micro-arcing and erratic plasma behaviour that no recipe adjustment can fully correct.
Replacement should follow the tool owner’s qualified preventive-maintenance procedure and be performed by trained personnel under cleanroom-compatible conditions. The following sequence reflects typical good practice for an upper-electrode silicon protection ring:
Silicon protection rings are scheduled consumables, so availability and consistency matter as much as unit price. ESCT Fab Support supplies ES7099-067 as a second-source alternative to the TEL OEM part, giving fabs a way to control cost and stock without compromising form, fit and function:
It shields the periphery of the upper-electrode assembly from plasma erosion while providing a defined top-electrode silicon ground reference. In doing so it helps anchor and confine the plasma at the top of the discharge and keeps the surface chemistry seen by the wafer consistent.
No. ES7099-067 is supplied as a new, second-source OEM-compatible part. It is cross-referenced to TEL OEM P/N 3D87-052882-12 and verified to form, fit and function, but it is not an original Tokyo Electron OEM component and is not sold as such.
As a sacrificial silicon consumable, its life depends on the recipe, power and duty cycle of your process. Most fabs set a replacement interval based on RF hours or wafer count, monitoring edge uniformity and particle data to trigger exchange before erosion reaches the protected hardware.
Typical indicators include visible thinning, edge rounding, cracks or chips, rising particle counts, drift in wafer-edge critical dimensions, and instability in RF tuning or reflected power. Any cracking warrants immediate replacement to avoid fracture and contamination.
Silicon rings are usually wet-cleaned to remove deposited films and returned to service until erosion or dimensional loss reaches the end-of-life limit. Once the silicon is thinned or cracked beyond the qualified threshold, the part should be replaced rather than cleaned again.
Indicative lead time is 4-5 weeks. The part is identified by ESCT P/N ES7099-067 and cross-referenced to OEM P/N 3D87-052882-12, which lets you match it directly against your TEL chamber bill of materials and PM kit lists.
The Silicon Protection Ring (TE GND Flat), ESCT P/N ES7099-067, is a high-purity silicon consumable for the upper-electrode region of TEL 300 mm plasma etch chambers. It protects the electrode assembly from erosion, provides a stable top-electrode ground reference and presents a clean silicon surface to the plasma, all of which directly influence edge uniformity, particle performance and RF stability. Supplied new as a second-source, OEM-compatible alternative to TEL P/N 3D87-052882-12 with a 4-5 week indicative lead time, it gives fabs a cost-effective, dimensionally consistent way to keep this scheduled consumable in stock without relying on single-source OEM supply.
Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Tokyo Electron part number 3D87-052882-12. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Tokyo Electron, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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