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The Silicon Protection Ring (TE GND Flat) is a high-purity silicon consumable installed at the wafer periphery inside Tokyo Electron (TEL) 300 mm plasma etch process chambers. Its primary job is to shield the underlying metallic chamber hardware (the cathode body, clamp hardware and edge structures) from direct exposure to energetic ions and reactive plasma species, while presenting a stable, sacrificial silicon surface at the wafer edge. The “TE GND Flat” designation refers to a machined flat on the ring’s circumference that keys the part to a fixed orientation and aligns the terminal ground reference, so the ring seats with the correct angular registration relative to the RF return path and the chamber datum.
Sitting in the transition zone between the active plasma sheath and the grounded chamber wall, the protection ring performs a dual electrical and protective function. Electrically, it helps establish a controlled silicon boundary condition around the wafer, supporting uniform sheath behaviour and a defined RF return reference through its ground flat. Physically, it is a barrier component: by absorbing ion bombardment that would otherwise sputter exposed aluminium or anodised surfaces, it protects expensive chamber hardware and suppresses metallic particle generation that would contaminate the wafer.
Because it is made from the same elemental material as the wafer, the silicon protection ring keeps the chemistry at the wafer edge consistent and predictable. Any material it does erode is silicon, compatible with the process and far less harmful than sputtered metals, which is precisely why this is treated as a routinely replaced consumable rather than a permanent chamber fixture.
Within a TEL 300 mm etch chamber, the protection ring operates as both a sacrificial shield and a defined electrical boundary at the wafer edge. Its key functions include:
The ring is machined from high-purity silicon, the material of choice for plasma-facing edge consumables in fluorine- and chlorine-based etch chemistries. Silicon erodes predictably under ion bombardment and reactive radical attack, and because it shares the wafer’s elemental chemistry, its consumption does not introduce foreign species into the etch environment.
Edge protection rings must hold tight tolerances on flatness, thickness and the position of the ground flat. Even small deviations alter the gap to the wafer and the local sheath geometry, shifting edge etch rate and uniformity. The machined flat guarantees that the ring seats in one correct orientation, preserving the intended electrical reference.
As an edge-region and grounding component, the condition of the protection ring is felt directly in device yield and chamber matching. A worn, cracked or incorrectly oriented ring degrades the very metrics fab engineers monitor most closely:
The dominant wear mode is gradual erosion from continuous ion bombardment and reactive radical attack. Over thousands of RF-hours the silicon thins and the exposed profile recedes, progressively altering the edge gap and sheath shape until edge uniformity drifts outside specification and the ring must be replaced.
Silicon is brittle, so thermal cycling, mechanical handling and localised hot spots can initiate cracks or edge chips. Once a crack forms it becomes a particle source and a discontinuity in the silicon boundary, risking wafer-edge defects and, in severe cases, fracture of the ring during a process cycle.
If the ring is installed without correct registration to the ground flat, or if contaminants build up at the seating interface, the terminal ground path becomes intermittent or resistive. This destabilises the RF return, producing arcing, impedance drift and uniformity problems that can be hard to trace back to the ring.
Replacement should follow the TEL maintenance procedure for the specific chamber, with strict particle and contamination control. A typical sequence is:
Edge consumables like the silicon protection ring wear on a predictable schedule, which makes them ideal candidates for managed stocking. Sourcing through ESCT Fab Support gives fabs a dependable, cost-controlled supply without compromising on form, fit and function:
It is a sacrificial, high-purity silicon ring fitted at the wafer edge inside a TEL 300 mm etch chamber. It shields the underlying metal hardware from ion bombardment, keeps the edge chemistry purely silicon-based, and provides a defined RF ground reference through its terminal ground flat to support stable, uniform plasma at the wafer perimeter.
No. This ring is supplied as a new, second-source, OEM-compatible part. It is manufactured and verified to match the form, fit and function of TEL OEM P/N 3D87-052882-12, but it is not an original Tokyo Electron-branded component and is offered as a compatible alternative.
The ground flat is a machined flat on the ring’s edge that fixes its orientation and aligns the terminal ground reference. It means the ring seats in the single correct angular position so the RF return path and electrical reference are consistent from one replacement to the next.
Service life depends on chamber, recipe and duty cycle, so it is best tracked against RF-hours, wafer counts or measured erosion rather than a fixed calendar interval. Most fabs replace the ring as part of scheduled preventive maintenance once erosion begins to affect edge uniformity or particle performance.
The typical lead time is 4 to 5 weeks. Because this is a wear consumable on a predictable schedule, we recommend maintaining buffer stock aligned to your PM cycle so replacements are always on hand when a chamber is opened.
Reference the ESCT part number ES7099-044 together with the OEM number 3D87-052882-12 and your chamber configuration. Our technical team can help confirm compatibility against your TEL 300 mm etch platform before you commit to an order.
The Silicon Protection Ring with Terminal Ground Flat (OEM P/N 3D87-052882-12, ESCT P/N ES7099-044) is a high-purity silicon edge consumable for Tokyo Electron 300 mm plasma etch chambers. It protects underlying chamber hardware from ion bombardment, keeps the wafer-edge chemistry process-compatible, and provides a keyed RF ground reference for stable, uniform plasma. As a predictable wear part, it is a strong candidate for managed stocking, and ESCT Fab Support offers it as a form-, fit- and function-verified second-source alternative with a typical 4 to 5 week lead time.
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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