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The Silicon Protection Ring identified by OEM part number 3D10-350067-11 is a plasma-facing consumable used in Tokyo Electron (TEL) 300 mm plasma etch process chambers. As its name suggests, the component is a high-purity silicon ring whose primary job is protection: it sits at the wafer periphery and shields the underlying chamber hardware, the electrostatic chuck edge, the lower electrode dielectric and the surrounding metal mounting hardware, from direct exposure to energetic ions, reactive radicals and the intense heat load of the plasma sheath. By presenting a sacrificial silicon surface to the discharge, it absorbs erosion that would otherwise attack permanent, expensive assemblies.
Within the chamber stack, the protection ring is one of the concentric ring components that frame the 300 mm wafer alongside the focus ring and cover ring. It occupies the transition zone between the active etch field over the wafer and the grounded chamber wall, where the plasma sheath bends sharply and electric fields concentrate. Because silicon is consumed by fluorine- and oxygen-bearing chemistries at roughly the same rate as the silicon wafer itself, a silicon protection ring presents a chemically consistent boundary to the plasma, helping to keep the edge environment predictable rather than introducing a foreign material that would perturb etch behaviour or shed metallic contamination.
Although physically simple, the part is a precision consumable. Its flatness, thickness, resistivity grade and surface finish all influence how the plasma terminates at the wafer edge and how cleanly the underlying hardware is preserved. When it wears down or cracks, the consequences propagate quickly into edge yield loss and unplanned downtime, which is why fabs hold it as a tracked spare and replace it on a defined preventive maintenance interval.
The protection ring performs several overlapping duties at the wafer edge, combining a physical shielding function with electrical and process-tuning roles that affect how every wafer in the lot is etched.
Protection rings of this class are machined from high-purity silicon, typically supplied to a controlled resistivity grade. The purity matters because any metallic or mobile-ion impurity liberated under bombardment becomes a contamination source directly adjacent to the wafer. The resistivity grade governs how the ring couples with the RF field and how it shares the plasma load with the wafer, so substituting an out-of-spec material can shift edge etch rate even when the geometry is identical.
Flatness, thickness and concentricity are tightly held so the ring seats cleanly against its mounting surface and presents a uniform height relative to the wafer plane. A defined surface finish reduces nucleation sites for polymer build-up and limits the generation of loose particles as the ring erodes. Even small departures from the OEM profile change how the sheath drapes over the edge and can therefore alter the etch result on the outermost dies.
Because the protection ring sits at the wafer edge and forms part of both the chemical and electrical boundary, its condition feeds directly into the metrics that fabs watch most closely. A worn, cracked or out-of-spec ring rarely fails silently; it shows up as drift in edge results long before it causes a hard fault.
The expected, designed-for failure mode is gradual erosion. Continuous ion bombardment and chemical etching steadily remove silicon, thinning the ring and rounding its exposed edges. As thickness drops below the validated window, the sheath geometry at the wafer edge changes and edge uniformity degrades, signalling that the planned replacement point has been reached.
Silicon is brittle, so thermal cycling, mechanical mishandling or uneven seating can initiate cracks or chips. A fractured ring is a serious event: it can release sizeable particles onto wafers, expose the hardware it was protecting, and in the worst case shed fragments into the chamber. Careful handling and correct seating are the main defences against premature fracture.
Fluorocarbon-rich etch chemistries deposit polymer films on chamber surfaces. Heavy build-up on the protection ring can flake during plasma transients, generating defects, while any back-side contamination or residue beneath the ring disturbs seating and the local electrical contact. Both effects shorten effective service life ahead of pure erosion.
Replacement should follow the TEL maintenance procedure for the specific chamber, performed by a trained technician under clean-handling discipline. The following sequence summarises good practice and is not a substitute for the OEM work instruction.
Plasma-facing silicon consumables are replaced on a routine basis, so availability and consistency matter as much as the parts themselves. ESCT Fab Support supplies this protection ring as a sourced, fit-for-function alternative to the OEM line item, helping fabs control cost and protect chamber uptime.
It is a sacrificial high-purity silicon ring at the wafer periphery that shields the electrostatic chuck edge, electrode dielectric and metal hardware from plasma erosion, while presenting a chemically matched silicon boundary that keeps the edge etch environment stable.
No. It is supplied as a new, second-source, OEM-compatible part. It is verified to the form, fit and function of TEL OEM P/N 3D10-350067-11 but it is not an original TEL OEM part and is not sold as such.
Service life depends on the etch chemistry, power and duty cycle of your process. It is a wear item replaced on a preventive-maintenance interval; once erosion thins the ring below the validated window or edge results begin to drift, it should be changed.
Silicon erodes at a rate similar to the silicon wafer and shares its chemistry, so it keeps edge plasma loading and by-product behaviour consistent and avoids introducing dissimilar contamination. The chosen material is dictated by the chamber design and process, so the ring should match the OEM specification.
Continuing to run a degraded ring risks edge etch-rate and critical-dimension drift, rising particle counts, and eventual exposure of the protected chuck and electrode hardware. A crack can release particles and fragments into the chamber, so a damaged ring should be replaced promptly.
The typical lead time is 4–5 weeks. Quote ESCT P/N ES7099-068 along with OEM P/N 3D10-350067-11 and your chamber details so we can confirm compatibility and help you plan stock against your maintenance schedule.
The Silicon Protection Ring (OEM P/N 3D10-350067-11, ESCT P/N ES7099-068) is a high-purity silicon consumable that protects the wafer-edge hardware in TEL 300 mm plasma etch chambers while helping to maintain a stable, contamination-free edge environment. As a sacrificial part exposed to continuous ion bombardment and reactive chemistry, it must meet tight purity, resistivity and dimensional specifications to preserve edge uniformity and yield. Supplied by ESCT Fab Support as a new, OEM-compatible alternative with a typical 4–5 week lead time, it offers a cost-effective, consistently available option for routine preventive maintenance of TEL etch tools.
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 3D10-350067-11. 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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