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The Silicon Ground Ring identified by Tokyo Electron part number 3D10-253182-11, and supplied by ESCT Fab Support as ES7099-141, is a high-purity silicon consumable that sits in the edge region of a TEL 300 mm plasma etch chamber. Its abbreviated catalogue name, “RING, SI GND, ” denotes a silicon (Si) ring that performs a grounding, or RF return, function. In a capacitively coupled etch chamber this ring forms part of the conductive boundary that surrounds the wafer and the powered electrode, closing the radio-frequency current loop and helping to define where the plasma terminates.
Although it is a passive part with no moving elements, the ground ring is one of the components that most directly shapes the electrical and physical conditions at the wafer edge. It establishes a controlled, repeatable path for RF return current, contributes to the symmetry of the plasma sheath, and screens the more expensive electrode and chamber hardware from direct ion and radical attack. Because it shares the wafer’s exposure to fluorine and oxygen-based chemistries and to continuous ion bombardment, it is treated as a scheduled consumable rather than a permanent assembly.
Understanding what the silicon ground ring does, how it wears, and when to replace it is central to maintaining edge etch uniformity and particle performance on a TEL etch platform. This page describes the component’s functional role, its material and process behaviour, the wear and failure mechanisms that drive replacement, and the practical steps for fitting a new ring during preventive maintenance.
In a TEL 300 mm plasma etch chamber the silicon ground ring occupies the annular zone around the electrostatic chuck and the focus or edge ring stack. From this position it performs several overlapping electrical and process functions that together govern conditions at the wafer perimeter.
The performance of a ground ring is determined as much by the grade and finish of the silicon as by its dimensions. Both the electrical behaviour and the erosion resistance of the part depend on tightly controlled material properties.
Ground rings are machined from high-purity silicon, frequently doped to achieve a defined resistivity so that the ring conducts RF reliably while remaining process-compatible. High purity matters because the ring is consumed during etching; trace metallic impurities released into the plasma would translate directly into wafer-level contamination and defectivity.
Flatness, thickness and the inner and outer diameters of the ring are held to tight tolerances because they set the gap geometry and the seating contact that carries RF current. A controlled surface finish manages both the contact resistance to the grounded chamber structure and the rate at which the exposed face erodes.
Because the ground ring controls the RF return path and the edge plasma boundary, its condition feeds directly into device yield, particularly for the die nearest the wafer edge. As the ring erodes or its grounding contact degrades, several measurable effects follow.
As an exposed silicon consumable, the ground ring degrades through predictable mechanisms. Recognising them helps an engineering team set sensible replacement intervals and interpret process drift.
Continuous ion bombardment and chemical attack steadily sputter and etch the exposed silicon surface. The ring thins, its surface roughens and the local geometry changes, gradually altering the edge field and the RF return characteristics until the part falls outside its usable window.
Silicon is hard but brittle. Thermal cycling, mechanical stress during handling, and uneven seating can initiate cracks or edge chips. Fractured silicon both compromises the grounding contact and sheds particles, and in the worst case a cracked ring can disturb plasma symmetry across the whole wafer.
Polymer build-up, oxidation or particulate at the seating interface raises the contact resistance of the RF return path, producing intermittent grounding, reflected power and arcing. Surface contamination and deposit accumulation also change the effective electrical behaviour of the ring well before it is fully eroded.
The silicon ground ring is replaced during scheduled preventive maintenance, normally alongside the focus or edge ring and other edge consumables. Always follow the relevant TEL maintenance procedure and your site’s safety rules; the steps below describe the typical sequence.
Edge consumables such as the silicon ground ring are exchanged on a regular cadence, so holding reliable stock avoids unplanned downtime. ESCT Fab Support supplies ES7099-141 as a cost-effective, verified alternative to sole-sourcing through the OEM.
It provides a controlled RF return path and a grounded electrical boundary around the wafer and electrode. This helps confine the plasma, keep the edge sheath symmetric, and protect the underlying hardware, all of which support uniform etching out to the wafer edge.
No. ES7099-141 is a second-source new part, not an original Tokyo Electron component. It is manufactured and verified to match the form, fit and function of OEM P/N 3D10-253182-11 and is offered as a compatible alternative to the OEM item.
It is machined from high-purity silicon, typically doped to a defined resistivity so that it conducts RF reliably. The high purity is important because the ring is consumed in the plasma, and any impurities would otherwise become wafer-level contamination.
Watch for drift in edge etch uniformity, rising reflected power or arcing, increased edge particle counts, and visible thinning, cracking or chipping during inspection. Most fabs replace the ring on a fixed preventive-maintenance interval informed by wafer counts and process history.
The indicative lead time is 4-5 weeks. Because edge consumables are replaced on a regular schedule, we recommend ordering ahead of planned maintenance so that the ring is on the shelf when the preventive-maintenance window arrives.
Yes. As the ring erodes or its grounding contact degrades, the edge electric field and RF return change, shifting etch rate and critical dimensions on the outermost die and raising the risk of particles and plasma instability. Timely replacement protects edge yield and overall process stability.
The Silicon Ground Ring (TEL P/N 3D10-253182-11, ESCT P/N ES7099-141) is a high-purity silicon consumable that establishes the RF return path and grounded plasma boundary at the wafer edge of a TEL 300 mm plasma etch chamber. By maintaining a stable edge field, confining the plasma and shielding higher-value hardware, it underpins edge etch uniformity, particle performance and yield. As an exposed consumable it erodes, can crack and can lose grounding contact over time, so it is replaced on a scheduled basis during preventive maintenance. ESCT Fab Support offers it as a second-source new alternative, verified to OEM form, fit and function, to keep TEL etch tools running with minimal downtime and a predictable spares strategy.
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 3D10-253182-11. 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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