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The CEL Outer Static Nesting Ring is a chamber-side consumable that sits at the perimeter of the cathode electrode (CEL) stack in Tokyo Electron 300 mm plasma etch process modules. In TEL terminology, the CEL is the silicon cathode/upper-electrode assembly that delivers RF energy and process gas into the plasma. This particular component is the outer ring that nests around and locates the central electrode, hence the descriptor “outer static (nest)”. The “V2” designation indicates the second-generation profile of this ring, reflecting an updated geometry or seating revision over the original part.
Within the chamber, the ring occupies the transition zone between the active electrode surface and the surrounding insulator and shield hardware. It is “static” in that it does not move during processing; instead, it provides a precisely toleranced seat, the nest, that registers the electrode and the parts above it, while presenting a controlled surface to the plasma at the electrode edge. Because it lives at the boundary of the electric field and the gas distribution region, its condition has a direct bearing on where and how the plasma terminates at the wafer’s outer diameter.
Although it carries no moving parts and no active electronics, the outer nesting ring is a precision consumable. Its dimensional stability, surface condition and material purity govern plasma confinement, RF return symmetry and particle performance at the chamber edge. As such, it is replaced on a planned cadence as part of preventive maintenance rather than run to catastrophic failure.
The ring performs several interlocking jobs at the cathode electrode perimeter. It is simultaneously a mechanical locator, a plasma-facing boundary surface and a contributor to field symmetry. Its principal functions include:
As a plasma-facing nesting ring in an etch chamber, this component must survive an aggressive environment of energetic ions, fluorine- and chlorine-based chemistries, elevated temperatures and steep thermal gradients, all while holding tight dimensional tolerances. Two performance themes dominate: how the material behaves under attack, and how its geometry interacts with the discharge.
Rings in this role are manufactured from high-purity materials selected for plasma resistance and low particle generation, typically high-purity silicon, quartz or a technical ceramic, depending on the electrode design. Whatever the base material, the key attributes are chemical inertness to the process gases, resistance to physical sputtering and freedom from trace contaminants that could migrate to the wafer.
The nesting features (seating diameters, step heights and the plasma-facing profile) are machined to close tolerances because they set the position of the electrode and the shape of the field at its edge. The V2 profile reflects a refined geometry intended to improve seating repeatability or edge uniformity relative to the original revision.
Because the ring sits exactly where the plasma terminates at the electrode edge, its condition propagates directly into process results at the wafer’s outer diameter, the very region where edge-die yield is won or lost. A worn, mis-seated or contaminated ring can express itself in several ways:
As a sacrificial plasma-facing consumable, this ring is expected to wear; the engineering goal is to replace it before that wear affects the wafer. Three degradation mechanisms dominate.
Continuous ion bombardment and chemical attack steadily erode the plasma-facing surface, rounding sharp edges and reducing material thickness. As the profile recedes, the field shape and confinement gap at the electrode edge drift away from their nominal values, gradually degrading edge uniformity until the ring reaches its replacement limit.
Late in life the eroded surface can roughen, micro-crack or develop redeposited films that flake under thermal and RF cycling. These liberated particles are a direct source of wafer defects, and a sudden rise in particle counts or arcing events is a common signal that the ring is past its useful service window.
Because the part is a precision nest, chips on the seating features, hairline cracks from handling or thermal shock, or debris trapped under the ring can all spoil concentricity and seating. A poorly seated ring shifts the electrode position and breaks the azimuthal symmetry the part is meant to guarantee, so any visible chip or crack is cause for rejection at installation.
Replacement should follow the TEL maintenance procedure for the specific platform and be carried out by trained personnel under appropriate cleanroom and ESD discipline. The following sequence describes the general approach:
Edge-defining electrode consumables wear on a predictable schedule, which makes them ideal candidates for a managed spares programme. ESCT Fab Support supplies this ring as a second-source, OEM-compatible part to help fabs control cost and lead time without compromising process integrity. Key advantages include:
It is the static outer ring that nests around the cathode electrode (CEL) at the top of a TEL plasma etch chamber. It locates the electrode on a precise seat and defines the plasma-facing boundary at the electrode edge, helping confine the discharge and keep edge etch uniformity consistent around the wafer.
No. This is supplied as a new, second-source, OEM-compatible part. It is manufactured to match the original TEL component to form, fit and function, but it is not an original OEM part and is not sold as one.
The current lead time is 4-5 weeks. We recommend factoring this into your preventive-maintenance schedule and holding appropriate safety stock so a worn ring can be replaced without unplanned tool downtime.
Order against OEM P/N 2L10-251343-21 or ESCT P/N ES7099-056. The “V2” descriptor is important: this is the second-generation profile of the ring, so confirm your chamber configuration calls for the V2 revision before ordering.
As a plasma-facing consumable it is replaced on a planned cadence driven by erosion, particle performance and edge-uniformity data rather than at a fixed universal interval. Each fab sets its own replacement limit based on RF hours, recipe mix and qualification results; rising particle counts or edge drift are typical triggers to swap it.
Because it is built to the original specification and V2 profile with precise seating geometry, a correctly installed ring is intended to preserve chamber-to-chamber matching. As with any consumable swap, run your standard post-maintenance qualification to confirm the chamber meets its uniformity and particle targets before returning to production.
The CEL Outer Static Nesting Ring V2 (OEM P/N 2L10-251343-21, ESCT P/N ES7099-056) is a precision plasma-facing consumable that nests around the cathode electrode in TEL 300 mm plasma etch chambers. It locates the electrode stack, defines the plasma boundary at the electrode edge and protects the hardware behind it, making it directly influential on edge etch uniformity, plasma confinement and particle performance. ESCT Fab Support offers it as a new, second-source, OEM-compatible part, verified to the original specification and available on a 4-5 week lead time, to help fabs maintain process stability while managing cost and supply risk.
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 2L10-251343-21. 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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