716-069688-005
CORE_INNER ELECTRODE

Inner electrode core (OEM P/N 716-069688-005), cathode assembly for LAM plasma etch systems

ESCT P/N ES2099-037 · Lam Research cathode core inner electrode · 2nd source new, lead time 4–5 weeks

The Inner Electrode Core, Lam Research OEM part number 716-069688-005, is a cathode-class consumable that sits at the heart of the powered electrode stack in a LAM plasma etch chamber. As its name suggests, this is the inner section of a segmented core electrode, the central conductive body that carries radio-frequency (RF) power up to the wafer plane and shapes the plasma sheath directly beneath and around the substrate. In a chamber where the electrode is divided into inner and outer zones, the inner electrode core governs the plasma conditions over the central region of the wafer, while a companion outer member handles the perimeter.

Because it forms part of the cathode, this component is on the live, driven side of the RF circuit rather than the grounded counter-electrode. It must conduct RF cleanly, present a stable and repeatable surface to the discharge, and survive continuous exposure to energetic ions and reactive radicals without shedding particles or drifting electrically. The inner electrode core therefore behaves as both an electrical element and a process-defining surface, and its condition has a direct, measurable effect on centre-to-edge etch behaviour.

ESCT Fab Support supplies this part under ESCT P/N ES2099-037 as a second-source, new component manufactured to match the form, fit and function of the original LAM item. It is offered as a cost-managed alternative for fabs maintaining installed LAM etch capacity, with a typical lead time of 4–5 weeks.

Functional role of the inner electrode core in LAM plasma etch platforms

Within the cathode stack, the inner electrode core performs several overlapping duties that together determine how uniformly and predictably the centre of the wafer etches. It is simultaneously a conductor, a plasma boundary and a thermal interface, and the chamber relies on all three roles being held to tight tolerance.

• Delivers RF power from the matching network into the central zone of the discharge, establishing the powered electrode surface beneath the wafer.
• Defines the geometry and uniformity of the plasma sheath over the inner wafer area, directly influencing centre etch rate and ion energy.
• Provides a stable electrical reference surface so that sheath voltage and ion flux remain repeatable wafer to wafer and across the chamber’s service life.
• Works in concert with the outer electrode segment to allow centre-to-edge tuning, where the inner zone is balanced against the perimeter to flatten the etch profile.
• Conducts heat into or out of the electrode mounting interface, helping to hold the surface temperature that governs polymer deposition and etch chemistry.
• Maintains a low-particle, dimensionally accurate surface so that confinement and process repeatability are preserved between preventive maintenance cycles.

Material and process performance

As a powered cathode consumable in a fluorine- and oxygen-bearing plasma environment, the inner electrode core is judged on how well its material withstands ion bombardment and chemical attack while retaining its electrical and dimensional integrity. Two related characteristics dominate its behaviour in service.

Erosion and surface integrity

The exposed face of the electrode is continuously sputtered by accelerated ions and etched by reactive species. The base material, typically a high-purity silicon or conductive electrode-grade body depending on the chamber configuration, is selected so that any erosion products are process-compatible and the surface recedes evenly rather than pitting.

• High material purity to avoid introducing metallic or mobile-ion contamination at the wafer surface.
• Uniform microstructure so that sputter erosion progresses smoothly and predictably across the face.
• Controlled surface finish that keeps particle generation low as the electrode ages.
• Dimensional stability so that the inner-to-outer gap and sheath geometry remain within specification.

Electrical conductivity and thermal coupling

Beyond surviving the plasma, the core must present a consistent, low-loss path for RF current and a repeatable thermal interface to its mount. Variation in either parameter shifts the local plasma impedance and the surface temperature, both of which change etch results.

• Stable bulk resistivity so that RF coupling into the central zone does not drift over the part’s life.
• Clean, flat mating surfaces for reliable electrical and thermal contact at the electrode interface.
• Compatibility with the chamber’s clamping and backside cooling scheme to hold target surface temperature.
• Resistance to arcing at edges and contact points, which protects both the part and the wafer.

Impact on tool performance and yield

Because the inner electrode core controls the central plasma zone, its condition propagates directly into device-level results. A worn, contaminated or electrically degraded core can undermine an otherwise healthy process and is a common root cause when centre-of-wafer signatures appear.

• Centre-to-edge etch non-uniformity as the inner sheath geometry drifts away from the outer zone balance.
• Drift in critical dimension and etch depth in the central region between qualification runs.
• Increased particle counts and defectivity as the eroding surface sheds material onto the wafer.
• RF instability, reflected-power excursions or arcing that trip the tool and stall production.
• Shorter intervals between wet cleans and re-qualifications, eroding overall equipment effectiveness.
• Scrap risk on high-value wafers if degradation is not caught before it crosses process limits.

Common wear and failure modes

Surface erosion and thinning

Continuous ion bombardment gradually sputters away the exposed face, thinning the electrode and altering the sheath profile over the wafer centre. Past a certain point the erosion changes the inner-to-outer gap enough to shift uniformity beyond what recipe tuning can recover, signalling end of life.

Particle generation and surface roughening

Localised pitting, micro-cracking or build-up of redeposited polymer can roughen the surface, raising defectivity. Flaking of accumulated deposits is a frequent particle source and is one of the main reasons the core is cleaned or replaced on a scheduled basis.

Electrical degradation and arcing

Worn contact surfaces, contamination at the mounting interface or cracks in the body can raise contact resistance and create high-field points. The result is RF coupling drift or arcing, which damages the electrode, disturbs the plasma and can mark the wafer, forcing an unplanned chamber entry.

Installation and replacement guidance

Replacement should follow the LAM-approved maintenance procedure for the specific chamber and be carried out by trained personnel under proper contamination control. The following sequence outlines the typical workflow; always defer to the OEM manual and your fab’s procedures.

• Place the tool in a safe maintenance state: shut off RF, vent the chamber per procedure and confirm all energy sources are isolated and locked out.
• Open the chamber and remove the surrounding hardware, rings, liners and any retaining components, needed to expose the core electrode stack.
• Carefully detach the existing inner electrode core, noting its orientation and the condition of the mating and contact surfaces.
• Clean and inspect the mounting interface, RF contact and backside cooling surfaces; remove residue and verify there is no damage or trapped particulate.
• Fit the new ES2099-037 core using clean-handling practice (gloves, lint-free tooling), seating it in the correct orientation with even, specified clamping.
• Reassemble the surrounding rings and hardware, then pump down and run leak, RF and recipe checks before returning to production.
• Qualify with monitor wafers, confirming centre-to-edge uniformity and particle levels are within specification before releasing the chamber.

Spare parts strategy for LAM etch consumables

Cathode and electrode consumables wear on a predictable cycle, which makes them ideal candidates for a planned spares strategy rather than reactive purchasing. Sourcing the inner electrode core through ESCT Fab Support gives engineering and procurement teams a dependable second-source channel that keeps installed LAM capacity productive.

• Second-source, new parts built to match the form, fit and function of OEM 716-069688-005.
• Cost-managed alternative to OEM list pricing, supporting tighter consumable budgets.
• Clear cross-reference between OEM 716-069688-005 and ESCT P/N ES2099-037 for accurate ordering.
• Predictable 4–5 week lead time that supports buffer stocking and planned maintenance scheduling.
• Reduced reliance on a single supply channel for critical cathode consumables.
• Application support to confirm suitability for your specific LAM chamber configuration.

Frequently asked questions

What does the inner electrode core do in a LAM etch chamber?

It is the central, powered section of the cathode electrode. It carries RF power into the centre of the discharge and shapes the plasma sheath over the inner part of the wafer, working alongside the outer electrode segment to control centre-to-edge etch uniformity.

Is this an original OEM part?

No. This is supplied as a second-source, new part manufactured to match the form, fit and function of LAM OEM P/N 716-069688-005. It is not an original LAM part and is offered as a compatible alternative under ESCT P/N ES2099-037.

How is it different from the outer electrode?

The inner core controls the central plasma zone over the wafer, while the outer electrode handles the perimeter. The two are balanced against each other to flatten the radial etch profile, so both must be in good condition for uniform results.

When should the inner electrode core be replaced?

It is replaced when surface erosion, particle generation or electrical degradation push centre-of-wafer uniformity, defectivity or RF stability outside process limits, or when scheduled preventive maintenance dictates. Monitoring uniformity trends and particle counts helps anticipate end of life.

What is the lead time for ES2099-037?

The typical lead time is 4–5 weeks. Because this is a wear consumable on a known replacement cycle, we recommend holding buffer stock and aligning orders with planned maintenance windows to avoid unplanned downtime.

Will it affect process qualification?

The part is built to match OEM form, fit and function, but as with any electrode consumable a chamber qualification with monitor wafers should follow installation. This confirms centre-to-edge uniformity, etch rate and particle performance before the chamber returns to production.

Summary

The Inner Electrode Core (LAM OEM P/N 716-069688-005, ESCT P/N ES2099-037) is a powered cathode consumable that delivers RF into the central plasma zone of a LAM etch chamber and shapes the sheath over the wafer centre. Its erosion, particle and electrical behaviour directly affect centre-to-edge uniformity, defectivity and RF stability, tying timely, well-qualified replacement to yield. Supplied by ESCT Fab Support as a second-source new part with a 4–5 week lead time, it offers a cost-managed, dependable route to keeping installed LAM etch capacity running at specification.

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 Lam Research part number 716-069688-005. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Lam Research, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.

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