0200-03233
L-COLLAR.,COLUMNAR Si 1.5mm STEP

Columnar silicon L-collar ring (OEM P/N 0200-03233), stepped edge collar for AMAT-compatible TEL 300 mm plasma etch systems

ESCT P/N ES1099-019, columnar Si L-collar with 1.5 mm step, 2nd source NEW

The Columnar Silicon L-Collar Ring is a precision-machined consumable that surrounds the wafer edge region inside a 300 mm plasma etch chamber. Its name describes its construction precisely: an “L-collar” is a ring whose cross-section is stepped rather than flat, presenting an L-shaped profile when viewed in section, while “columnar Si” refers to the cast columnar-grain silicon stock from which the part is machined. The “1.5 mm STEP” calls out the height of the machined ledge that locates the collar against the adjacent edge ring or cathode hardware and sets the gap geometry seen by the plasma at the wafer perimeter.

In a TEL 300 mm etch chamber, parts of this kind live in the most aggressive zone of the tool, the annular ring stack that encircles the wafer. They sit directly in the path of energetic ions and reactive fluorine- or chlorine-bearing radicals, and they share the RF environment with the electrostatic chuck, the focus ring and the silicon electrode above. Because the collar is silicon, it is chemically and electrically compatible with the wafer it protects, eroding in a controlled way rather than shedding metallic or polymeric contamination into the process.

Although it is a comparatively small component, the L-collar has an outsized influence on edge etch uniformity, plasma confinement at the wafer perimeter and particle performance. As it erodes, the very geometry that controls the edge sheath changes, which is why it is treated as a scheduled consumable and replaced on a defined wear interval rather than run to failure.

Functional role of the L-collar ring in AMAT-compatible TEL etch platforms

The collar’s job is to manage the transition between the wafer surface and the chamber hardware at the very edge of the process zone. The 1.5 mm step is not cosmetic, it sets the vertical relationship between the collar and the neighbouring ring, which in turn shapes the local electric field and the path reactive species take across the wafer edge. Its principal functions are:

• Extending the effective silicon surface beyond the wafer so that the plasma sheath bends smoothly at the perimeter instead of terminating abruptly on the wafer itself.
• Using the 1.5 mm step to register the collar against the adjacent edge ring or cathode, fixing the gap and step height that govern edge sheath shape.
• Steering ion trajectories at the outermost die so that sidewall angle and etch depth remain within specification right to the wafer edge.
• Confining the plasma to the intended annular region and shielding underlying metal hardware from direct ion bombardment and chemical attack.
• Providing a sacrificial, wafer-compatible silicon surface that erodes predictably, keeping the chemistry of the edge region clean.
• Contributing to the RF return path and the capacitive coupling at the wafer edge, so that power delivered to the perimeter stays balanced with the wafer centre.

Material and process performance

Columnar silicon stock

Columnar silicon is a cast, directionally solidified material whose grains grow as elongated columns aligned roughly perpendicular to the working face. This structure gives the collar a favourable balance of cost, mechanical resilience and controlled erosion behaviour compared with single-crystal silicon, which is why it is widely used for sacrificial edge hardware. Key material characteristics include:

• High-purity silicon that erodes into volatile or wafer-compatible products under fluorine and chlorine chemistries, avoiding metallic contamination.
• Columnar grain structure that resists thermal-shock cracking better than coarse polycrystalline alternatives during rapid plasma on/off cycling.
• Controlled resistivity so the collar behaves as a predictable element in the edge RF circuit rather than as an insulator or a short.
• Stable behaviour at the elevated surface temperatures generated by sustained ion bombardment in high-density plasmas.

Stepped L-profile geometry

The machined L-profile and its 1.5 mm step are the features that make this collar process-specific. Tight control of these dimensions is what lets the part reproduce the intended edge environment from one replacement to the next:

• A precisely held 1.5 mm step height that sets the gap and overlap with the adjacent ring, directly influencing edge etch rate and sidewall profile.
• Flat, parallel seating faces for good thermal and electrical contact with the cathode or supporting ring.
• Concentric inner and outer diameters that keep the collar centred to the wafer, preserving azimuthal uniformity around the edge.
• A surface finish chosen to limit particle generation and to give repeatable initial etch behaviour during the seasoning of a fresh part.

Impact on tool performance and yield

Because the L-collar defines the edge environment, its condition feeds directly into the metrics fabs care about most. A collar that is fresh and correctly seated supports tight edge-to-edge results; one that is worn, cracked or mis-located degrades them in ways that are easy to misread as a process drift elsewhere in the tool.

• Edge etch uniformity: as the step erodes, edge etch rate and critical dimension drift, shrinking the usable die count at the wafer perimeter.
• Profile control: a changing step gap tilts ion trajectories, producing tapered or bowed sidewalls on the outermost die.
• Particle performance: a flaking or cracked collar adds defects that can scrap wafers and trigger unplanned wet cleans.
• Plasma stability: degraded RF coupling at the edge can shift impedance and make the etch harder to match and repeat.
• Tool availability: a worn collar left in service forces reactive downtime, whereas scheduled replacement keeps the chamber on a planned PM cadence.

Common wear and failure modes

Erosion of the step and sealing faces

The dominant wear mechanism is steady chemical and physical erosion of the exposed silicon. The 1.5 mm step thins over time, the sharp transition rounds off, and the gap geometry that controls the edge sheath slowly opens up. This is normal end-of-life behaviour and the reason the collar is tracked against RF-hours or wafer count and swapped at a set threshold.

Cracking and chipping

Silicon is brittle, so thermal cycling, mechanical mishandling during a PM, or an uneven seat can initiate cracks at the thin step or at the inner diameter. A cracked collar is an immediate particle source and can fracture further in situ, so any chip or crack found at inspection should retire the part regardless of its remaining erosion margin.

Mis-seating and contamination

If debris is trapped under the collar or the seating faces are not clean and flat, the part sits proud or tilted, breaking the intended step relationship and the thermal/electrical contact. The result is azimuthal non-uniformity and local hot spots. Polymer build-up and residue on a part run too long likewise change its surface chemistry and can flake into the chamber.

Installation and replacement guidance

Replacement is a routine preventive-maintenance task but demands clean-room discipline because silicon edge hardware is fragile and contamination-sensitive. The following sequence reflects good general practice; always defer to your facility’s qualified PM procedure for the specific chamber.

• Vent the chamber, confirm it is at a safe temperature and follow lock-out/tag-out before opening the lid.
• Remove the worn collar with clean, powder-free gloves and dedicated tooling, supporting it evenly to avoid stressing the thin step.
• Inspect and clean the seating surfaces of the cathode and adjacent ring, removing all polymer, residue and particulate.
• Inspect the new collar for chips, cracks and correct step height before fitting, and verify it matches the documented part.
• Seat the new collar flat and concentric, confirming the 1.5 mm step engages the mating feature with no rock, tilt or trapped debris.
• Close the chamber, pump down, leak-check and run any required seasoning or conditioning recipe on the fresh silicon.
• Run qualification wafers, confirm edge uniformity and particle counts, and log the change against the chamber’s consumable history.

Spare parts strategy for AMAT-compatible TEL etch consumables

Edge consumables like the L-collar are replaced on a predictable cadence, which makes them an ideal candidate for a managed sparing programme. Holding qualified stock prevents a worn ring from becoming an unplanned tool-down event and protects edge yield across a fleet of chambers. ESCT Fab Support offers:

• A 2nd source, brand-new collar verified to the form, fit and function of OEM P/N 0200-03233 under ESCT P/N ES1099-019.
• Columnar silicon and stepped geometry matched to the original so existing recipes and PM intervals carry over.
• A typical lead time of 4-5 weeks, supporting planned reorder points and buffer stock rather than emergency buys.
• Competitive cost relative to OEM pricing, lowering the per-wafer cost of consumables across the fleet.
• Consistent incoming quality and inspection, so each replacement behaves like the last.
• Technical support to help cross-check fit and plan replacement schedules for your specific chambers.

Frequently asked questions

What does the “1.5 mm STEP” in the part name mean?

It is the height of the machined ledge in the collar’s L-shaped cross-section. That 1.5 mm step locates the collar against the adjacent ring or cathode and sets the gap and overlap that shape the plasma sheath at the wafer edge, so it is a functional dimension held to tight tolerance, not a cosmetic detail.

Is this an original AMAT OEM part?

No. This is a 2nd source, brand-new part supplied as an OEM-compatible equivalent to AMAT P/N 0200-03233. It is manufactured and inspected to match the original collar’s form, fit and function, but it is not an original OEM-branded item and is offered as a compatible alternative.

Why is the collar made from columnar silicon rather than another material?

Silicon is chemically and electrically compatible with the wafer, so it erodes into wafer-friendly products instead of introducing metallic or polymeric contamination. The columnar cast structure adds mechanical and thermal-shock resilience at a sensible cost, which is why it is favoured for sacrificial edge hardware.

How do I know when to replace it?

The collar is a consumable tracked against RF-hours or wafer count and replaced at a defined threshold before erosion of the step degrades edge uniformity. Any crack, chip or rising edge particle count is also cause for immediate replacement regardless of the elapsed wear interval.

Will it affect my existing etch recipe?

Because the part reproduces the original material and stepped geometry, it is designed to drop into your existing process without recipe changes. As with any fresh silicon edge part, a short seasoning or conditioning step followed by qualification wafers is recommended to confirm edge uniformity and particle performance.

What is the lead time for this collar?

The typical lead time is 4-5 weeks. Because this is a scheduled consumable, we recommend holding buffer stock and setting reorder points around that lead time so a worn collar never becomes an unplanned tool-down event.

Summary

The Columnar Silicon L-Collar Ring (OEM P/N 0200-03233, ESCT P/N ES1099-019) is a stepped silicon edge consumable that controls the plasma environment at the wafer perimeter in 300 mm plasma etch chambers. Its 1.5 mm step sets the gap and coupling that govern edge etch uniformity, sidewall profile and particle performance, while the columnar silicon construction keeps the edge region clean and erodes predictably. Supplied as a 2nd source, brand-new OEM-compatible part with a 4-5 week lead time, it lets fabs maintain edge yield and a planned PM cadence at a competitive cost.

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 0200-03233. 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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