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The TEL focus ring identified by OEM part number 3D10-251037-V1 is a precision annular consumable used in Tokyo Electron 300 mm plasma etch process chambers, where it surrounds the wafer at the outermost edge of the electrostatic chuck. Catalogued by ESCT Fab Support as ES7099-098 and originally designated within the PM380-303 process module hardware set, this ring sits in the highest-stress region of the etch reactor, the boundary where the energised plasma sheath transitions from the silicon wafer to the surrounding chamber hardware. Its job is deceptively simple in description but critical in execution: to extend the plasma electrically and geometrically beyond the wafer edge so that the outermost dies see the same etch environment as the wafer centre.
In a 300 mm capacitively coupled etch chamber, a wafer without a focus ring would suffer severe ion-tilt and field termination at its perimeter, distorting feature profiles across the outer annulus and pushing edge die into scrap. The focus ring corrects this by presenting a sacrificial dielectric or semiconducting surface that the plasma sheath can rest upon, effectively “borrowing” the ring so that the sheath stays flat and vertical right out to the last millimetre of usable silicon. Because the ring is directly bombarded by ions throughout every process step, it is treated as a planned-replacement consumable rather than a durable component.
Understanding what this part actually does, and how it degrades, is central to managing edge yield, particle performance and chamber-matching across a fleet of TEL etchers. The sections below describe the functional role, material behaviour, yield impact, wear modes and replacement practice specific to this focus ring.
The focus ring is an active participant in the plasma physics of the chamber, not a passive spacer. Concentric with the wafer and seated on the cathode assembly just outboard of the wafer edge, it shapes the electric field, manages the sheath geometry and provides a defined consumption surface so that the wafer itself is protected. Its principal functions include:
Focus rings for TEL etch chambers are manufactured from carefully selected plasma-resistant materials whose electrical and erosion characteristics are matched to the specific process chemistry. The material grade is never incidental: it sets the consumption rate, particle behaviour and the dielectric or semiconducting properties that couple the ring into the plasma. This 2nd source NEW component is produced to replicate the form, fit and material function of the original TEL part.
Depending on the process the ring may be fabricated from high-purity silicon, silicon carbide or a quartz-class material, each chosen for predictable, low-particle erosion under fluorine- or chlorine-based chemistries. The goal is a uniform, self-similar wear profile: the ring should recede evenly rather than pitting or cracking, so that its electrical influence drifts slowly and predictably between scheduled replacements.
Because the ring’s inner diameter, step profile and thickness define the plasma boundary, dimensional accuracy is as important as material grade. A ring that is even slightly out of specification shifts the sheath geometry and degrades edge uniformity. Equally, its resistivity and dielectric behaviour must match the original so that RF coupling and self-bias at the wafer edge remain consistent from chamber to chamber.
The condition of the focus ring is one of the strongest single determinants of edge-die yield in a TEL etch process. As the ring erodes, its electrical and geometric effect on the sheath drifts, and the outermost wafer annulus is the first region to fall out of specification. The practical consequences of a worn, mismatched or incorrectly installed ring include:
As a directly exposed consumable, the focus ring follows characteristic degradation paths. Recognising them helps to set realistic replacement intervals and to distinguish normal end-of-life from premature failure.
The dominant wear mode is steady thinning under continuous ion bombardment. As the ring loses height, the wafer-to-ring step changes and the sheath progressively bends at the edge, gradually pushing edge uniformity out of specification. This is the wear that drives the scheduled replacement interval.
Repeated thermal cycling and mechanical handling can initiate micro-cracks that propagate into chips or fractures. A cracked ring is a serious particle source and can break apart during processing, risking wafer loss and contamination of the chamber and chuck below it.
Etch by-products and polymer can accumulate on the ring, while ion sputtering roughens the exposed surface. Both effects increase particle shedding and can alter the local electrical environment, degrading edge results well before the ring reaches its nominal erosion limit.
Focus ring replacement is a routine but contamination-sensitive preventive-maintenance task. Always follow the official Tokyo Electron maintenance procedure and your fab’s safety protocols for the specific chamber. The following sequence outlines good general practice:
Focus rings are high-frequency consumables, so their availability directly affects chamber uptime and the cost per wafer. ESCT Fab Support supplies ES7099-098 as a second-source alternative that lets fabs manage consumable spend and supply risk without compromising edge performance. Key advantages include:
It surrounds the wafer at the edge of the electrostatic chuck and extends the plasma sheath beyond the wafer perimeter. This keeps ion trajectories vertical at the wafer edge, preserving etch profile and critical dimension on the outermost dies that would otherwise be lost to field distortion.
No. ES7099-098 is supplied as a 2nd source, brand-new OEM-compatible part. It is manufactured to match the form, fit and function of the original Tokyo Electron focus ring 3D10-251037-V1, but it is not an original OEM-branded component.
Replacement intervals depend on the process chemistry, RF power and total plasma hours, so they are set by each fab’s process engineering data rather than a universal figure. Because the ring erodes steadily under ion bombardment, most fabs schedule replacement against accumulated process time or measured step-height loss before edge uniformity drifts out of specification.
The current lead time for ES7099-098 is approximately 4-5 weeks. Because focus rings are consumed on a regular cycle, we recommend holding buffer stock and ordering ahead of planned PM windows to protect chamber uptime.
Yes. Long before a ring cracks or reaches its erosion limit, gradual step-height loss and surface roughening shift the edge sheath and increase particles, degrading edge-die results. This is why rings are replaced on a preventive schedule and why edge uniformity is monitored as a leading indicator.
It can. Two chambers running the same recipe with rings at different erosion states will present slightly different edge sheath geometries, which shows up as chamber-to-chamber mismatch at the wafer edge. Consistent part geometry and disciplined replacement tracking help keep a fleet matched.
The TEL focus ring 3D10-251037-V1, catalogued by ESCT Fab Support as ES7099-098 and associated with the PM380-303 process module, is a frontline consumable that governs edge etch uniformity in Tokyo Electron 300 mm plasma etch chambers. By extending and shaping the plasma sheath beyond the wafer perimeter, it protects critical dimension and profile on the most yield-sensitive dies, while serving as the sacrificial surface that absorbs ion bombardment. Selecting a correctly specified ring, replacing it on a disciplined schedule and tracking its wear are all central to stable edge yield, low particle counts and consistent chamber matching. ESCT supplies this part as a verified second-source alternative to support uptime and consumable-cost management.
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 3D10-251037-V1. 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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