3D87-052882-12
SILICON RING , PROTECTION(TE GND FLAT)

Silicon protection ring, grounded (OEM P/N 3D87-052882-12), plasma-facing silicon ground ring for TEL 300 mm etch systems

ESCT P/N ES7099-069 · OEM P/N 3D87-052882-12 · Tokyo Electron (TEL) 300 mm plasma etch chambers

The Silicon Protection Ring (OEM P/N 3D87-052882-12) is a high-purity silicon consumable installed in the upper electrode and chamber-lid assembly of Tokyo Electron (TEL) 300 mm plasma etch process modules. The designation “PROTECTION (TE GND FLAT)” identifies a grounded protection ring carrying a machined flat, an alignment and orientation feature that fixes the ring’s rotational position relative to the electrode and its ground tie-point. In service the ring sits as a sacrificial shield around a sensitive electrode or insulator surface, intercepting plasma and ion flux that would otherwise erode more costly assemblies.

Because it is fabricated from process-grade silicon rather than quartz or an oxide ceramic, this ring is chemically compatible with fluorine- and chlorine-based etch chemistries and behaves predictably under the same plasma that the wafer experiences. Its grounded configuration means it does more than physically protect, it forms part of the radio-frequency (RF) return and DC ground network of the chamber, helping to define where current flows and how the plasma sheath terminates at the edge of the active region.

As a plasma-facing consumable, the Silicon Protection Ring is consumed slowly and deliberately so that the surfaces it guards are not. Its condition therefore has a direct bearing on chamber matching, particle performance and the consistency of edge etch results across long production campaigns, which is why it is replaced on a planned preventive-maintenance schedule rather than allowed to run to failure.

Functional role of the silicon protection ring in TEL plasma etch platforms

Within a TEL 300 mm etch chamber the Silicon Protection Ring performs several overlapping duties, combining mechanical shielding with electrical and plasma-management functions:

• Shields the underlying electrode, insulator or lid hardware from direct plasma exposure and ion bombardment, acting as a sacrificial barrier that is replaced instead of the assembly behind it.
• Provides a defined ground reference for the surrounding plasma, completing part of the RF return path and stabilising the potential at the periphery of the active area.
• Helps confine and shape the plasma at the chamber edge, contributing to a uniform sheath and predictable ion-energy distribution near the wafer perimeter.
• Uses its machined orientation flat to guarantee repeatable rotational alignment, so the ground contact and any gas or feature geometry register correctly at every install.
• Presents a silicon surface that participates in the etch chemistry in a controlled way, scavenging reactive fluorine species and helping to maintain a stable radical balance.
• Reduces metallic and arc-related contamination by keeping energetic plasma off non-silicon structural surfaces that would otherwise sputter.

Material and process performance

Silicon purity and plasma compatibility

The ring is made from high-purity silicon selected for low trace-metal content and uniform resistivity, so that it neither introduces mobile contaminants nor disturbs the electrical character of the chamber. Silicon is chosen deliberately because it etches and ages in step with the process, allowing the protection ring to behave as a clean, sacrificial extension of the chamber environment rather than an alien surface.

• High-purity, low-metals silicon to minimise particle and contamination risk to the wafer.
• Controlled resistivity so the grounded ring presents a consistent, predictable electrical interface.
• Compatibility with fluorine- and chlorine-based etch and clean chemistries used across TEL etch recipes.
• Erosion characteristics that match the surrounding silicon hardware, keeping chamber ageing uniform.

Dimensional and surface stability

Form, fit and function depend on tight control of the ring’s flatness, thickness and the geometry of its orientation flat. A precisely machined surface makes intimate contact at the ground interface and a repeatable gap to adjacent hardware, both of which give stable plasma behaviour and reliable chamber-to-chamber matching.

• Flat, parallel sealing and contact faces for consistent grounding and seating.
• Accurately located orientation flat to guarantee correct rotational alignment on install.
• Tight thickness tolerance to preserve electrode-to-plasma spacing and sheath geometry.
• Clean, low-defect surface finish to limit particle generation and arc initiation sites.

Impact on tool performance and yield

A worn, cracked or poorly seated Silicon Protection Ring is felt directly at the wafer edge and in chamber stability. Because the ring sets a ground reference and protects sensitive surfaces, its degradation tends to show up as drift before it becomes an outright fault:

• Edge etch-rate and profile drift as the ring thins and its surface chemistry changes.
• Degraded ground contact, leading to RF instability, impedance shifts and harder striking or matching.
• Increased particle counts and defect adders once the silicon roughens or begins to spall.
• Arcing risk where exposed non-silicon surfaces are reached by the plasma, threatening the protected assembly.
• Reduced chamber-to-chamber matching, complicating recipe portability across a fleet of etch modules.
• Unplanned downtime and yield loss if erosion is allowed to expose the hardware the ring is meant to guard.

Common wear and failure modes

Plasma erosion and thinning

The dominant wear mechanism is steady erosion of the silicon by ion bombardment and reactive species. As material is removed the ring thins, its surface roughens, and the spacing and ground geometry it defines begin to shift, gradually moving edge results and chamber electrical characteristics away from their qualified baseline.

Cracking and thermal stress

Silicon is brittle, so repeated thermal cycling, mechanical clamping stress or mishandling during maintenance can initiate hairline cracks. These may propagate into chips or fracture under cyclic load, generating particles and, in the worst case, leaving the protected surface exposed mid-campaign.

Ground-contact degradation and deposition

Process by-products and polymer can build up at the ring’s ground interface, while erosion roughens the contact face. The result is a higher-resistance or intermittent ground path that disturbs RF return, encourages localised arcing and undermines plasma stability long before the ring is visibly worn out.

Installation and replacement guidance

Replacement should follow the TEL maintenance procedure for the specific etch module and be carried out under proper cleanroom and ESD discipline. Silicon parts are fragile and contamination-sensitive, so handle it carefully. A typical sequence is:

• Vent the chamber and lock out the tool per the OEM safety procedure, allowing surfaces to cool fully before access.
• Open the lid or electrode assembly and document the orientation of the existing ring, noting how its flat is aligned to the ground tie-point.
• Remove the worn ring carefully, then inspect the seating surface and ground interface for deposition, erosion or damage and clean as specified.
• Unpack the new ring with clean, powder-free gloves, handling only at its edges and inspecting for chips, cracks or surface defects.
• Seat the ring with its orientation flat aligned to the reference feature, confirming it lies flat with full, even contact at the ground surface.
• Reassemble the electrode or lid hardware to the specified clamping or torque values, avoiding point loads that could crack the silicon.
• Pump down, leak-check, then season and re-qualify the chamber, verifying RF match, particle performance and edge etch results before returning to production.

Spare parts strategy for TEL 300 mm etch consumables

Plasma-facing silicon parts are scheduled consumables, so a reliable supply at predictable cost protects both uptime and yield. ESCT Fab Support supplies the Silicon Protection Ring (ESCT P/N ES7099-069) as a sourced alternative to the OEM part, verified to form, fit and function, with the following advantages:

• High-purity silicon construction matched to the OEM material and geometry, including the orientation flat.
• Verification to form, fit and function for confident drop-in replacement on qualified TEL etch modules.
• A cost-competitive second-source alternative that reduces dependence on a single supply channel.
• A nominal lead time of 4–5 weeks to support planned preventive-maintenance scheduling.
• Cross-referencing by OEM P/N 3D87-052882-12 and ESCT P/N ES7099-069 for straightforward ordering.
• Support for fleet standardisation and consumable kitting across multiple etch chambers.

Frequently asked questions

What does this silicon protection ring actually do in the chamber?

It acts as a grounded, sacrificial silicon shield in the upper electrode or lid region of a TEL 300 mm etch chamber. It protects sensitive surfaces from plasma and ion erosion, provides a defined ground reference for the RF return path, and helps shape and confine the plasma at the chamber edge.

Is this an original OEM part?

No. This is a new, second-source, OEM-compatible part supplied by ESCT Fab Support and verified to form, fit and function. It is not an original Tokyo Electron (TEL) component and is not sold as one; the OEM part number is provided solely for cross-reference.

What is the significance of the “GND FLAT” feature?

“GND” denotes that the ring is grounded and forms part of the chamber’s electrical return network, while the “FLAT” refers to a machined flat on the ring used to set and lock its rotational orientation. Aligning that flat correctly registers the ground contact and ring geometry the same way at every installation.

Why is the ring made of silicon rather than quartz or ceramic?

Silicon is chosen because it is chemically and electrically compatible with the etch environment, ages in step with the surrounding silicon hardware and participates in the chemistry in a controlled, predictable way. This keeps chamber matching stable and minimises the introduction of foreign contamination at the wafer edge.

How often should it be replaced?

As a plasma-facing consumable it is replaced on a preventive-maintenance interval driven by your process chemistry, RF power and accumulated run time, not by a fixed calendar date. Erosion, surface roughening, rising particle counts or RF matching drift are the practical signals that the ring is approaching end of life.

What is the lead time and how do I order?

The Silicon Protection Ring (ESCT P/N ES7099-069) carries a nominal lead time of 4–5 weeks. Orders and cross-reference enquiries can be placed using either the ESCT part number or OEM P/N 3D87-052882-12, and we can support scheduled kitting to align deliveries with your maintenance windows.

Summary

The Silicon Protection Ring (OEM P/N 3D87-052882-12, ESCT P/N ES7099-069) is a grounded, high-purity silicon consumable for Tokyo Electron 300 mm plasma etch chambers. With its orientation flat and grounded configuration, it shields sensitive electrode and lid surfaces, anchors the RF return path and helps shape the plasma at the wafer edge, making it a small but central part in edge etch uniformity, particle performance and chamber matching. Supplied by ESCT as a verified second-source alternative with a 4–5 week lead time, it offers a cost-effective, dependable way to keep TEL etch modules running to their qualified baseline.

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 3D87-052882-12. 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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