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The Silicon Top Ring (PRO) is a high-purity silicon consumable that installs in the upper region of a Tokyo Electron (TEL) 300 mm plasma etch process chamber, encircling the wafer process zone at the top of the reactor cavity. As a top-mounted silicon ring, it forms part of the upper electrode and confinement assembly that bounds the plasma above and around the wafer, working alongside the silicon electrode, focus ring and chamber liner to define the geometry within which ion and radical flux reach the wafer surface. The “PRO” designation reflects an enhanced specification of the part intended for demanding production etch recipes.
In a 300 mm plasma etcher, every surface that faces the discharge influences the result. Silicon is chosen for top-ring and upper-electrode hardware because it is chemically compatible with fluorine- and chlorine-based etch chemistries, contributes minimal metallic contamination, and behaves as a sacrificial fluorine scavenger that helps stabilise the gas-phase chemistry. The Silicon Top Ring (PRO) sits directly in this plasma-facing role, where it experiences continuous ion bombardment, radical attack and thermal cycling throughout each production lot.
Because the ring helps shape the upper plasma boundary and participates in the RF and chemical environment of the chamber, its condition has a direct bearing on etch rate stability, within-wafer uniformity and defectivity. As a wear consumable, it is replaced on a planned preventive-maintenance schedule before erosion shifts the chamber out of its qualified process window. This page describes the function, materials behaviour, failure modes and replacement practice for the Silicon Top Ring (PRO) as supplied by ESCT Fab Support under part number ES1099-004.
The Silicon Top Ring (PRO) is far more than a passive spacer. As a plasma-facing silicon component in the upper chamber, it simultaneously performs structural, chemical and electrical functions that together hold the etch process within specification:
The Silicon Top Ring (PRO) is manufactured from high-purity silicon selected for low metallic and mobile-ion content. In fluorine-rich etch chemistries the silicon surface reacts with free fluorine to form volatile silicon fluoride species, which is precisely the sacrificial mechanism that helps regulate gas-phase fluorine concentration. The trade-off is that this same reactivity causes the ring to erode over time. Tight control of bulk resistivity, crystal orientation and surface finish means the part etches predictably and does not become a source of particles or metallic contamination as it wears.
During processing the ring is subjected to repeated thermal cycling and sustained ion bombardment. Silicon offers good thermal conductivity and dimensional stability across the operating temperature range, which helps maintain consistent surface temperature and therefore consistent reaction kinetics at the plasma boundary. As the surface erodes, its thickness and edge geometry gradually change; this is the normal, expected wear behaviour that ultimately sets the part’s replacement interval.
Because the Silicon Top Ring (PRO) sits on the boundary of the active plasma, its physical and chemical state feeds directly into the metrics that fabs watch most closely. A ring that is within specification supports stable, centred process results; a worn or damaged ring quietly degrades them:
The dominant ageing mechanism is gradual erosion of the silicon by ion bombardment and fluorine attack. Over many process hours the ring thins and its edges round off, shifting the upper-chamber geometry and the fluorine-scavenging contribution. This is expected wear, but once erosion carries the chamber outside its qualified window the ring must be replaced.
Localised pitting, micro-cracking or surface flaking can develop where erosion is uneven or where thermal stress concentrates. These features become particle sources that land on the wafer as killer defects, and in severe cases a crack can propagate and compromise the structural integrity of the ring.
Polymer and by-product deposits accumulate on the ring between cleans and can flake if allowed to build up, while chips or contamination introduced during handling and installation create immediate defect risk. Silicon is brittle, so careless seating, over-torquing or contact with hard surfaces can fracture the part before it ever sees plasma.
Replacement of the Silicon Top Ring (PRO) should follow the tool owner’s approved preventive-maintenance procedure and be carried out by trained personnel. The following sequence reflects general good practice for plasma-facing silicon hardware:
Silicon top rings are recurring consumables, so a sound sourcing strategy keeps spares on hand and protects chamber availability. ESCT Fab Support provides the Silicon Top Ring (PRO) under ES1099-004 as a cost-effective, verified alternative to single-source OEM purchasing:
It is a plasma-facing silicon ring in the upper region of a TEL 300 mm etch chamber. It helps confine and shape the upper plasma boundary, scavenges free fluorine to stabilise the etch chemistry, maintains the qualified upper-chamber geometry and protects longer-life hardware behind it from direct plasma erosion.
No. This is supplied as a new, OEM-compatible part sourced from a second source. It is not an original Applied Materials (AMAT) part, but it is verified to the form, fit and function of OEM P/N 0200-03576K so that it can be used as a direct replacement.
It is made from high-purity silicon selected for low metallic and mobile-ion content, which provides chemical compatibility with fluorine- and chlorine-based etch chemistries and minimises contamination of the wafer and chamber.
The ring is a wear consumable and is normally replaced on a preventive-maintenance schedule based on accumulated RF or process hours. Signs that replacement is due include visible thinning, pitting or cracking, rising particle counts and drift in etch rate, endpoint time or uniformity that pushes SPC out of limits.
The typical lead time is 4-5 weeks. We recommend holding spares against your planned PM intervals so that a ring is always available when the chamber is scheduled for service.
As with any plasma-facing consumable, after replacement you should season the chamber and run your normal qualification or SPC wafers to confirm the process is centred before returning the tool to production. The part is built to OEM form, fit and function to support a smooth requalification.
The Silicon Top Ring (PRO), ESCT P/N ES1099-004, is a high-purity silicon consumable for the upper region of Tokyo Electron 300 mm plasma etch chambers, cross-referenced to OEM P/N 0200-03576K. It confines and shapes the upper plasma, scavenges fluorine to stabilise the etch chemistry, preserves the qualified chamber geometry and shields higher-value hardware from erosion. As a sacrificial part it wears through erosion, pitting and deposition, so it is best managed on a planned replacement schedule with verified spares on hand. Supplied with a typical 4-5 week lead time and built to OEM form, fit and function, ES1099-004 offers a dependable, cost-effective route to keeping TEL etch chambers in qualified production.
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 Applied Materials part number 0200-03576K. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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