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The silicon focus ring supplied under ESCT P/N ES7099-028 is a high-purity single-crystal silicon consumable engineered to encircle the 300 mm wafer inside a Tokyo Electron plasma etch chamber. Cross-referenced to TEL OEM part number 1810-329535-11, it sits on the electrostatic chuck assembly at the wafer periphery, where it forms the immediate boundary between the wafer edge and the surrounding chamber hardware. In this position it is one of the most plasma-exposed and process-critical consumables in the entire etch module.
A focus ring, sometimes described as an edge ring, does far more than physically frame the wafer. By extending the electrically active surface beyond the silicon disc, it lengthens and reshapes the plasma sheath so that the field lines bending at the wafer edge are pushed outward onto the ring instead of distorting the etch at the outermost dies. Because this particular ring is itself made of silicon, it presents the plasma with a chemically and electrically near-identical surface to the wafer, minimising the abrupt material discontinuity that would otherwise skew edge etch behaviour. The dimensional descriptor associated with this item indicates a tightly toleranced height and seating geometry, which matters because even small changes in ring height directly translate into measurable shifts in edge etch rate and profile angle.
In a 300 mm fab running advanced logic or memory devices, every wafer carries thousands of die, and a disproportionate share of the yield risk lives in the outer few millimetres. The focus ring is the single component most responsible for protecting that edge zone, which is why it is treated as a scheduled-replacement consumable rather than a permanent fixture.
Within a TEL 300 mm plasma etch chamber, the silicon focus ring performs several overlapping electrical, electrostatic and mechanical duties simultaneously. Its presence and condition govern how cleanly the plasma terminates at the wafer edge and how reproducibly the outer die etch matches the centre.
As a silicon consumable subjected to continuous ion bombardment and reactive fluorine- or chlorine-based chemistries, the value of this focus ring is set almost entirely by its material quality and dimensional integrity. Two characteristics dominate its behaviour in service.
The ring is machined from high-purity silicon so that, as it erodes, it does not release metallic or particulate contaminants into the wafer environment. Controlled purity and consistent crystal quality give a predictable, slow erosion signature, which in turn allows the etch recipe to be compensated as the ring ages and lets the fab forecast replacement intervals with confidence.
Focus ring performance is acutely sensitive to height, flatness and inner-diameter tolerance. The toleranced dimension indicated for this part reflects the need to seat the ring at exactly the right elevation relative to the wafer surface. A ring that is too tall over-confines the edge plasma; one that is too low, or worn beyond its limit, lets the sheath collapse inward and tilts the etch at the wafer edge. Tight machining therefore directly protects the edge process window.
Because the focus ring controls the most yield-sensitive region of the wafer, its condition propagates directly into device-level metrics and into overall tool availability.
The silicon focus ring is a wear part by design, and its end of life is reached through gradual erosion punctuated by occasional acute failures. Recognising the dominant modes helps planners set replacement intervals before yield is affected.
Continuous ion bombardment steadily thins the upper surface and inner edge of the ring. As height is lost, the sheath profile at the wafer edge changes, edge etch rate drifts and profile tilt grows until the ring falls outside its usable window and must be replaced.
Silicon is brittle, and repeated thermal cycling combined with clamping and handling stress can initiate hairline cracks. A cracked ring can fracture in chamber, generating large particle events and risking damage to the wafer and the underlying electrostatic chuck.
As erosion proceeds non-uniformly, the plasma-facing surface roughens and can develop micro-flaking. This raises the background particle count and increases the likelihood of edge-die defects long before the ring reaches its mechanical limit.
Replacing the focus ring is a routine but exacting preventive-maintenance task. Because the ring sits on a sensitive electrostatic chuck and influences edge process directly, cleanliness and correct seating are paramount. The following sequence reflects good practice for a TEL etch chamber.
Focus rings are scheduled consumables, so a reliable, qualified supply keeps etch tools productive without over-committing capital to a single sourcing channel. Working with ESCT Fab Support for ES7099-028 offers several advantages.
It encircles the 300 mm wafer at the periphery and extends the plasma-facing silicon surface outward, shaping the plasma sheath so that ions strike the wafer edge vertically. This protects edge etch uniformity, profile and critical dimensions across the outermost dies.
No. This is a 2nd-source new part supplied as an OEM-compatible component cross-referenced to TEL OEM P/N 1810-329535-11. It is manufactured to match the original in form, fit and function, but it is not an original OEM part and is not sold as one.
Typical indicators are drifting edge etch rate, increasing profile tilt at the wafer edge, rising particle counts and measured height loss approaching the ring’s erosion limit. Most fabs replace the ring at a scheduled wafer or RF-hour count derived from these trends.
A silicon ring presents the plasma with a surface chemically and electrically similar to the wafer itself, minimising the discontinuity at the wafer edge. This keeps edge etch chemistry consistent and avoids introducing foreign material as the ring erodes.
Yes. Focus ring height and seating geometry are tightly toleranced because small dimensional changes shift the sheath profile at the wafer edge. The specified tolerance seats the ring at the correct elevation and reproduces the intended edge process window.
The typical lead time is 4–5 weeks. As the ring is a recurring consumable, it is best to hold buffer stock aligned to your preventive-maintenance cadence so that replacement never depends on incoming delivery.
The silicon focus ring under ESCT P/N ES7099-028, cross-referenced to TEL OEM P/N 1810-329535-11, is a critical edge-confinement consumable for Tokyo Electron 300 mm plasma etch chambers. By extending a high-purity silicon surface around the wafer, it shapes the plasma sheath, protects edge etch uniformity and profile, and shields the underlying chuck from ion bombardment. Its performance depends on silicon purity and tight dimensional tolerance, and it wears predictably through erosion, with cracking and surface roughening as secondary failure modes. Supplied as a 2nd-source new part with a 4–5 week lead time, it gives fabs a dependable, cost-effective way to keep etch tools matched and productive.
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 1810-329535-11. 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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