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The Inner Electrode is the powered cathode that sits at the heart of a 300 mm capacitively coupled plasma (CCP) etch chamber. In LAM dielectric and conductor etch platforms, the cathode is the lower powered electrode against which the wafer and its supporting hardware are referenced. It is the component through which radio-frequency (RF) energy is delivered into the process gap, establishing the plasma sheath that accelerates ions vertically into the wafer surface. The designation “18-step” refers to the stepped, concentric profile machined into the electrode face, a geometry tuned to shape the local electric field and gas conductance across the radius of a 300 mm substrate so that etch behaviour at the wafer edge mirrors that at the centre.
Because it is an inner electrode, this part forms the central, wafer-facing portion of a larger electrode stack. It works in concert with surrounding confinement and ground hardware to define the active plasma volume, while delivering the RF potential that does the work of etching. Its surface is in direct line of sight to the discharge, so it is continuously exposed to energetic ion bombardment, reactive fluorine- and chlorine-based chemistries, and the thermal loading that accompanies high-density plasma operation.
As a precision RF cathode, the Inner Electrode is both an electrical and a process-defining component. Small changes in its surface condition, flatness or electrical contact translate directly into changes in etch rate, profile angle and within-wafer uniformity. For that reason it is treated as a controlled consumable: it is inspected, characterised and replaced on a defined schedule rather than run to outright failure.
Within the chamber, the Inner Electrode performs several overlapping duties simultaneously, it is at once an RF delivery surface, a field-shaping structure and a thermally managed boundary of the plasma. Its principal functions include:
As a plasma-facing cathode, the Inner Electrode must combine clean electrical conduction with chemical and physical resilience against an aggressive discharge environment. Its performance is governed both by the bulk material from which it is machined and by the precision of its finished surface.
Electrodes of this class are manufactured from process-grade conductive materials selected for compatibility with fluorine- and chlorine-bearing etch chemistries, typically high-purity silicon or a conductive substrate finished to a controlled surface state. The objective is to erode predictably and cleanly under ion bombardment without shedding particles or introducing metallic contamination into the plasma.
The 18-step face is a precision-machined feature, and the value of the electrode lies as much in its geometry as in its material. Step depths, radial transitions, flatness and surface finish must all be held to tight tolerances, because the field-shaping effect that delivers radial uniformity depends directly on this profile.
Because the Inner Electrode defines where and how RF energy enters the plasma, its condition is felt directly in process results. A healthy, in-specification electrode underpins consistent device dimensions and high yield; a worn or compromised one degrades these in ways that can be subtle at first and severe at the limit.
As a plasma-facing cathode, the Inner Electrode wears continuously in service. Recognising the dominant degradation pathways allows process and equipment teams to schedule replacement before yield is affected.
Sustained ion bombardment gradually sputters material from the wafer-facing surface, rounding the sharp edges of the 18-step profile and thinning the electrode. As the field-shaping geometry softens, radial uniformity drifts and etch rate at the wafer edge begins to diverge from the centre.
Over time, polymer build-up, redeposition and micro-roughening of the surface can lead to flaking and particle release. These particles land on the wafer as adders and can cause defects, while contaminated regions disturb local plasma behaviour and undermine process repeatability.
Loss of clean, low-impedance contact at the electrode mounting interface (through oxidation, debris or mechanical loosening) raises local impedance and can trigger arcing. Arcing damages the electrode surface, causes RF instability and may scrap wafers, making contact integrity a key inspection point.
Replacement of the Inner Electrode is a planned preventive-maintenance activity that should be carried out by trained technicians following the relevant LAM procedures, observing all lockout/tagout, RF safety and contamination-control requirements. The following sequence summarises good practice:
Cathode electrodes are recurring consumables, so a sound spares strategy protects both yield and uptime. ESCT Fab Support supplies the Inner Electrode (ES2099-047) as a form-, fit- and function-verified alternative to the OEM part, helping fabs control cost and de-risk supply:
It is the powered RF cathode at the centre of the electrode stack. It couples RF energy into the process gap to sustain the plasma, sets the cathode sheath that drives ion energy, and uses its stepped face to shape the radial field so that etching is uniform across the 300 mm wafer.
No. This is supplied as a second-source new part that is OEM-compatible. It is verified to match OEM P/N 716-069688-005 in form, fit and function, but it is not an original LAM-branded component and is not sold as one.
It refers to the concentric, stepped profile machined into the electrode face. The steps tune the local electric field and gas conductance across the wafer radius, which is how the electrode helps balance edge-to-centre etch uniformity on a 300 mm substrate.
Replacement is normally driven by accumulated RF hours or wafer count, supported by trend data on etch uniformity, particle counts and RF stability. Visible profile erosion, surface roughening or signs of arcing at the contact interface are clear indicators that the part has reached end of life.
Any plasma-facing electrode replacement should be followed by chamber seasoning and qualification on monitor wafers per your site procedures. Because the part is dimensionally and functionally matched to the OEM electrode, it is designed to requalify within your established process window.
The planned lead time is 4-5 weeks. We recommend holding spares and aligning orders with your preventive-maintenance cadence so that a verified electrode is always on hand when a PM falls due.
The Inner Electrode (18-step, 300 mm), OEM P/N 716-069688-005 and ESCT P/N ES2099-047, is the powered RF cathode that drives plasma generation and radial uniformity in LAM 300 mm etch chambers. Its material purity, precise stepped geometry and clean RF contact are central to etch rate, profile control, particle performance and yield. As a wear consumable subject to erosion, contamination and contact degradation, it benefits from planned replacement and a solid spares strategy, which ESCT supports with a form-, fit- and function-verified second-source part and a predictable 4-5 week lead time.
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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