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The Core Inner Electrode is the central, inner-zone section of the powered silicon cathode assembly used in LAM plasma etch process chambers. In a segmented top or bottom electrode design, the “inner” core occupies the region directly above or beneath the central area of the wafer, where it works alongside the surrounding outer electrode and edge components to present a continuous, conditioned silicon surface to the plasma. As a cathode-class part it is not a passive shield: it carries RF energy into the discharge, is consumed by ion bombardment and reactive chemistry, and helps fix the geometry of the plasma sheath that ultimately defines etch behaviour across the wafer.
Because it sits at the heart of the electrode stack, the Core Inner Electrode disproportionately influences centre-of-wafer process results. Its surface condition, flatness and electrical contact determine how uniformly power couples into the plasma above the wafer centre, and its silicon chemistry participates directly in fluorocarbon and halogen etch reactions. A worn, cracked or poorly seated core electrode shows up immediately as centre-to-edge non-uniformity, drifting etch rates and rising particle counts.
ESCT Fab Support supplies the Core Inner Electrode under part number ES2099-041 as a second-source, new component verified to the form, fit and function of LAM OEM P/N 716-069688-005. It is intended as a direct, drop-in consumable for fabs seeking to control spares cost and lead time without compromising chamber performance.
Within the etch chamber the Core Inner Electrode performs several tightly coupled duties at once, electrical, chemical and mechanical. It is part of the RF-driven cathode, so its behaviour is bound up with power delivery, plasma confinement and the reactive surface chemistry that drives the etch itself.
As a silicon cathode consumable, the value of the Core Inner Electrode is determined by its material purity, surface finish and dimensional control. These properties dictate both how cleanly it etches and how long it survives in an aggressive plasma environment.
Cathode electrodes of this type are manufactured from high-resistivity, high-purity silicon so that trace metals and mobile contaminants are not sputtered into the chamber and onto the wafer. The silicon surface is chemically active in fluorine- and chlorine-bearing plasmas, consuming free radicals and helping to keep etch rate and selectivity stable from wafer to wafer. Consistent bulk purity is what allows a second-source electrode to deliver the same defect and metals performance expected from the original.
Surface flatness and a controlled finish keep the electrode-to-wafer gap uniform and the sheath well behaved across the inner zone. A tightly specified finish also slows micro-roughening under ion bombardment, which is what eventually causes particle generation and rate drift. Dimensional accuracy at the mounting and mating features gives correct seating against the outer electrode and reliable, repeatable RF contact over the service life of the part.
Because it governs the central etch zone, the condition of the Core Inner Electrode is felt directly in process metrics and ultimately in device yield. A degraded core electrode rarely fails silently, it shifts results in ways that consume engineering time and scrap budget.
Continuous ion bombardment and reactive chemistry steadily consume the silicon surface. Over time the inner zone thins and roughens, which changes the local sheath, shifts centre-of-wafer etch rate and begins to generate particles. This is the normal, expected end-of-life mechanism for a cathode electrode and is why it is treated as a scheduled consumable.
Silicon is brittle, and repeated thermal cycling combined with mechanical clamping stress can initiate cracks, particularly around mounting features or at edges. A cracked core electrode is a serious event: it can shed large particles, distort the RF path and, in the worst case, fragment inside the chamber, forcing an unplanned wet clean and full requalification.
Poor or deteriorating contact between the core electrode and its mating surfaces raises RF impedance locally, producing arcing, hot spots and reflected-power excursions. Contamination, deposition build-up or a warped seating interface can all manifest as intermittent power-coupling faults that mimic generator or match-network problems and are easy to misdiagnose.
Replacement should follow the platform’s documented maintenance procedure and be carried out by trained personnel under proper contamination controls. The following sequence outlines the typical approach for an inner cathode electrode.
Cathode electrodes are scheduled-wear items, so they are an ideal candidate for a managed second-source spares strategy. ESCT Fab Support helps fabs hold the right parts at the right cost without exposing chambers to avoidable risk.
It is the inner, central section of the powered silicon cathode in a LAM plasma etch chamber. It couples RF power into the plasma over the wafer centre, presents a reactive silicon surface to the etch chemistry, and helps fix the sheath geometry that controls centre-of-wafer uniformity.
No. This is a second-source, new component supplied by ESCT Fab Support under ES2099-041 and verified to the form, fit and function of LAM OEM P/N 716-069688-005. It is not an original OEM part and is not sold as one.
Service life depends on process chemistry, power and duty cycle, so it is best governed by your own preventive-maintenance data and in-line monitors. As a consumable it should be replaced on a planned schedule once erosion, drift or particle trends approach your control limits, rather than run to failure.
Typical indicators are creeping centre-to-edge etch non-uniformity, etch-rate or critical-dimension drift, rising particle and defect counts, and occasionally unstable RF coupling or reflected-power excursions linked to surface or contact degradation.
It is built from high-purity silicon to matching dimensions and finish so that, after normal seasoning and qualification, it should reproduce the etch, uniformity and particle behaviour of the part it replaces. We always recommend running your standard chamber qualification before returning to production.
The typical lead time is 4-5 weeks. Order using ESCT P/N ES2099-041, quoting the LAM OEM reference 716-069688-005 and your chamber configuration, and our team can confirm applicability before you commit.
The Core Inner Electrode (LAM OEM P/N 716-069688-005, ESCT P/N ES2099-041) is the central silicon cathode segment that drives RF power and reactive chemistry over the wafer centre in LAM plasma etch chambers. Its purity, flatness and contact integrity directly shape etch uniformity, particle performance and tool availability, and as a scheduled-wear consumable it is well suited to a cost-controlled second-source spares programme. Supplied new and verified to form, fit and function, ES2099-041 offers a dependable, lower-cost alternative for keeping etch chambers in qualification.
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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