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The TEL Focus Ring identified by OEM part number 2010-259999-11 is an annular, plasma-exposed consumable that surrounds the 300 mm wafer on the lower electrode (cathode) assembly of a Tokyo Electron plasma etch chamber. Within the ATC-BSP family of TEL etch process modules, this focus ring sits concentric with the wafer, occupying the narrow annular gap between the wafer edge and the chamber’s grounded confinement hardware. Its principal job is to extend the wafer’s electrical and thermal boundary outward so that the plasma sheath remains uniform all the way to the extreme edge of the substrate.
In a high-density etch chamber, the few millimetres of process space at the wafer perimeter behave very differently from the chamber centre. Without a correctly profiled ring of matched electrical properties, the sheath bends, the ion trajectories tilt and the etch front skews. The focus ring is the component engineered specifically to suppress this edge effect, recovering usable die from the outermost rows of the wafer where modern device economics demand near-perfect yield. The “7.5–360” designation in the raw part name reflects its dimensional and full-circumference (360°) profile within the consumable set.
Because it is directly bombarded by reactive ions and radicals throughout every plasma cycle, the focus ring is a scheduled consumable: it erodes predictably, shifts the process window as it thins, and must be replaced on a defined interval to hold edge etch performance and particle counts within specification. Sourcing a verified, form-fit-and-function equivalent such as ESCT part ES7099-101 is therefore central to keeping cost-of-ownership in check.
The focus ring is not a passive spacer. It is an active part of the chamber’s electrical and electromagnetic geometry, tuned to carry the plasma sheath smoothly across the wafer-to-ring transition. On a TEL lower-electrode assembly it performs several interlinked functions simultaneously:
Focus rings for TEL etch chambers are manufactured from materials selected to balance plasma resistance, electrical behaviour and particle cleanliness. The exact material is matched to the process the chamber runs, with the most common choices being high-purity silicon, silicon carbide or quartz, each carrying distinct erosion and contamination signatures.
The ring must survive continuous fluorine- and oxygen-bearing chemistries together with energetic ion bombardment while eroding at a slow, predictable rate. Material grade and surface finish are chosen to keep that erosion uniform and to avoid the micro-masking and roughening that generate defects.
The ring’s inner diameter, step height and seating geometry are specified tightly because they directly set the wafer-edge sheath shape. A few tenths of a millimetre of deviation can shift edge tilt and CD, so dimensional fidelity to the OEM profile is required.
Because the focus ring governs the most demanding region of the wafer, its condition translates directly into measurable process and yield metrics. A worn, mismatched or contaminated ring shows up quickly in edge data:
The dominant wear mode is simple consumption: ion bombardment steadily thins the ring and reshapes its step profile. As height is lost, the wafer-edge sheath drops and ion tilt at the perimeter increases, pushing edge CD and profile out of specification even before any visible damage appears.
Thermal cycling and mechanical handling can crack or chip brittle silicon, silicon-carbide or quartz rings, particularly near the inner edge where they are thinnest after erosion. A cracked ring becomes a particle source and can disturb local RF behaviour, so any visible fracture warrants immediate replacement.
Over time the exposed surface roughens and accumulates polymer or etch by-product deposits. These layers flake under thermal and plasma stress, raising defect counts, and they can also alter the ring’s effective electrical load, contributing to gradual process drift between scheduled cleans.
Focus-ring replacement is a routine preventive-maintenance activity, but because the part defines edge process behaviour it must be handled with care and installed exactly to the OEM procedure. The following sequence reflects general good practice; always follow your site’s qualified maintenance documentation for the specific chamber.
Focus rings are high-frequency consumables, so a reliable supply at a sensible cost is fundamental to fab economics. ESCT Fab Support stocks and sources verified equivalents to keep your TEL etch fleet running without overpaying or waiting on extended OEM lead times.
It surrounds the 300 mm wafer on the lower electrode and extends the plasma sheath beyond the wafer edge. This keeps ion trajectories vertical at the perimeter, preserving edge critical dimension, profile and etch uniformity on the outermost die.
No. This item is supplied as a new, OEM-compatible part from a second source. It is verified to match the original TEL part (OEM P/N 2010-259999-11) in form, fit and function, but it is not an original Tokyo Electron branded component.
Replacement is driven by accumulated plasma hours and the resulting erosion rather than a fixed calendar date. Each process and recipe wears the ring at a different rate, so most fabs set a consumable interval based on edge-CD drift, uniformity and particle data for their specific application.
The standard lead time for this part is approximately 4–5 weeks. We recommend holding buffer stock of high-use consumables such as focus rings so that planned maintenance is never gated by procurement.
Tell-tale signs include measurable edge critical-dimension or profile drift, degrading within-wafer uniformity, rising particle counts and visible thinning, roughening or chipping of the ring on inspection. Any crack is cause for immediate replacement.
A fresh ring restores the edge sheath to its as-new geometry, so a brief season or conditioning recipe followed by an edge-CD and particle qualification is advised before returning the chamber to production. Once qualified, a correctly matched ring should reproduce the established process window.
The TEL focus ring supplied under ESCT P/N ES7099-101 (OEM P/N 2010-259999-11) is a plasma-exposed edge-confinement consumable for Tokyo Electron 300 mm etch chambers. By extending the plasma sheath beyond the wafer edge and presenting a matched electrical and thermal boundary, it protects edge critical dimension, etch uniformity and particle performance, while sacrificially shielding the more costly electrode hardware behind it. As a predictable wear part, it benefits from a planned spare-parts strategy: ESCT offers a verified second-source equivalent with traceable part references, competitive pricing and a defined 4–5 week lead time to keep your etch fleet qualified 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 2010-259999-11. 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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