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The focus ring identified by OEM part number 2L10-252059-11 is an annular plasma-facing consumable used in Tokyo Electron (TEL) 300 mm plasma etch process chambers. It sits concentrically around the production wafer, on the wafer support pedestal, extending the electrically and thermally active surface of the chuck beyond the silicon edge. In doing so it shapes the boundary of the plasma sheath at the wafer perimeter, the most difficult region of the wafer to etch uniformly. The internal dimensional references carried in the raw part name (a nominal 360 outer reference, a 320 inner reference and a 4.6 thickness figure, in millimetres) describe a thin, wide ring whose precise geometry is integral to how the etch behaves at the outermost dies.
In a high-density plasma etcher, the electric field that accelerates ions towards the wafer must remain perpendicular at the very edge of the substrate. Without a focus ring, the field lines bend inwards over the last few millimetres of silicon, tilting ion trajectories and degrading the profile of features near the wafer periphery. The focus ring restores a flat, continuous reference surface so that the sheath, and therefore the ion flux, stays vertical right out to the wafer edge. It is consequently one of the principal levers an integration engineer has for controlling edge-to-edge etch uniformity and edge die yield.
Because it is directly exposed to energetic ion bombardment and reactive chemistry, the focus ring is a scheduled consumable. It erodes predictably over thousands of radio-frequency (RF) hours, and its condition drifts the process long before it fails outright. Maintaining a reliable supply of dimensionally accurate, correctly specified focus rings is therefore central to keeping a TEL etch fleet matched and in control.
Within a TEL 300 mm etch chamber, the focus ring performs several coupled functions simultaneously, spanning electrostatic, plasma and thermal domains:
Focus rings for TEL etch chambers are typically fabricated from high-purity silicon or silicon carbide, selected so that the ring erodes in a clean, well-characterised manner and contributes no foreign species to the process. A silicon-based ring sputters into the same chemistry already present in a silicon etch, avoiding metallic contamination and keeping the etch by-products predictable. The material is chosen for resistance to fluorine- and chlorine-based chemistries, dimensional stability under thermal cycling, and a low and uniform erosion rate so that process drift is gradual and correctable.
The performance of a focus ring depends as much on its geometry as on its material. The inner diameter must clear the wafer with a tightly controlled gap, the flatness and parallelism of the top face set the local sheath height, and the thickness (here on the order of 4.6 mm) determines how the ring couples to the wafer edge as both surfaces erode together. Surface finish and edge profile are held to fine tolerances because small departures alter the radial electric field and shift edge uniformity.
Because it governs the most sensitive part of the wafer, the condition of the focus ring feeds directly into device yield and tool availability. As the ring erodes, its effects accumulate in ways that are easy to mistake for other faults:
The dominant wear mode is gradual sputter erosion of the top surface and inner edge under continuous ion bombardment. As the ring thins, the height relationship between ring and wafer changes, the sheath drops at the edge, and ion tilt returns, pushing edge profiles and critical dimensions off target. This is the normal end-of-life mechanism and the reason the ring is treated as a scheduled consumable rather than a permanent part.
Repeated thermal cycling between process temperature and idle, combined with the brittleness of silicon and silicon carbide, can initiate hairline cracks, often from a chip, a handling mark or a localised hot spot. A cracked ring becomes a particle source and can fracture during a process or transfer, contaminating the chamber and potentially damaging the wafer or chuck.
Over time, etch by-products and polymer can build up on and around the ring, then flake under thermal or mechanical stress, causing defect excursions. Localised arcing or non-uniform erosion can also roughen the surface, accelerating both particle release and uneven coupling. These effects make particle performance, as much as raw dimensions, a key trigger for replacement.
Focus-ring replacement is a routine preventive-maintenance task, but because the part is brittle and its seating directly affects process behaviour, it should follow a disciplined sequence carried out by trained personnel under appropriate cleanroom and lock-out conditions:
Focus rings are high-frequency consumables, so their availability and consistency directly affect both cost of ownership and tool uptime. ESCT Fab Support supplies this ring as a sourcing alternative to single-channel OEM procurement, with the priorities a fab cares about:
It surrounds the wafer on the support pedestal and extends the plasma sheath beyond the silicon edge, keeping ion trajectories vertical at the wafer periphery. This is what allows the etch to stay uniform and on-profile across the outermost dies rather than tilting and degrading near the edge.
No. This focus ring is supplied as a new, second-source, OEM-compatible consumable. It is manufactured to match the original part to form, fit and function under reference OEM P/N 2L10-252059-11, but it is not an original Tokyo Electron OEM part and is not sold as such.
Focus rings of this type are made from high-purity silicon or silicon carbide. These materials erode cleanly under plasma, resist fluorine- and chlorine-based chemistries, and avoid introducing metallic contamination, which keeps etch by-products predictable and particle performance under control.
Replacement is usually triggered by accumulated RF hours, by measured drift in edge etch rate, uniformity or critical dimensions, or by a rise in particles. Many fabs set a fixed RF-hour limit derived from erosion data and then confirm with periodic edge-uniformity and defect checks.
Consistent dimensions and material properties are exactly what tool matching depends on. Because this ring is verified to the original specification, it is intended to drop into the same qualification window as the part it replaces; as with any consumable change, run your standard matching and qualification recipe before returning the chamber to production.
The typical lead time is 4–5 weeks. Reorder using ESCT P/N ES7099-136, which maps to OEM P/N 2L10-252059-11, so that the correct ring is identified without ambiguity. ESCT can confirm applicability to your specific chamber configuration before you commit an order.
The focus ring under OEM P/N 2L10-252059-11 (ESCT P/N ES7099-136) is a critical plasma-edge-confinement consumable for TEL 300 mm etch process chambers. By extending the plasma sheath beyond the wafer and holding a precise, repeatable edge geometry, it governs edge etch uniformity, ion-energy control and particle performance, and therefore directly influences edge-die yield and tool availability. Treated correctly as a scheduled, dimensionally controlled consumable, a well-specified focus ring keeps a TEL etch fleet matched, stable and productive. ESCT supplies this ring as a verified, second-source alternative with reliable lead times and traceable part referencing.
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 2L10-252059-11. 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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