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The Outer Electrode Ring (OEM P/N 839-020965-005) is a sintered silicon carbide (SiC) annular electrode component used in LAM FLEX-class plasma etch chambers. It is the outermost conductive ring of the upper or lower electrode assembly, surrounding the active wafer footprint and forming the radial boundary of the powered electrode surface. As an edge electrode, it extends the electrical and plasma-coupling characteristics of the main electrode beyond the wafer edge, so that the discharge does not simply collapse at the boundary of the silicon disc.
In a 300 mm plasma etch process, the few millimetres of radius nearest the wafer edge are disproportionately difficult to control. Sheath geometry bends, ion trajectories tilt, and species concentrations change where the conductive wafer surface gives way to surrounding hardware. The outer electrode ring is the component engineered to manage exactly this transition. By presenting a SiC surface with electrical and thermal properties matched to the process, it smooths the discontinuity between the wafer and the chamber wall, stabilising the plasma sheath across the critical edge zone.
Silicon carbide is chosen here for a specific combination of attributes: high purity, excellent plasma erosion resistance in fluorine- and oxygen-bearing chemistries, good electrical conductivity for RF coupling, and high thermal conductivity for uniform edge temperature. The FLEX45 designation indicates the platform generation and the ring geometry it is cut to. Because this ring is consumed by ion bombardment and chemical attack over time, it is a scheduled-replacement consumable rather than a permanent assembly, and its condition directly governs edge yield.
Within the chamber stack, the outer electrode ring works alongside the inner electrode, focus and edge rings, and the RF delivery network to define the shape and uniformity of the plasma at the wafer periphery. Its responsibilities span electrical, electromagnetic, thermal and particle-control domains simultaneously.
High-purity sintered SiC combines hardness, chemical inertness and useful electrical conductivity, making it well suited to a powered edge electrode that must both carry RF current and survive aggressive etch chemistries.
Beyond bulk material, the ring’s machined geometry and surface finish are critical because they set the gap and field relationship between the electrode edge and the wafer.
Because it sits exactly where edge non-uniformity originates, the condition of the outer electrode ring is felt directly in the data: edge die yield, etch-rate maps and particle counts all respond to its wear state.
Continuous ion bombardment and chemical attack gradually erode the SiC surface, thinning the ring and changing the edge gap geometry. As material is lost, edge etch-rate roll-off worsens and the wafer edge exclusion zone widens, eventually pushing edge die out of specification.
Localised erosion, micro-arcing or thermal cycling can produce pits and surface cracks. These features roughen the surface, accelerate further attack and release particulate that lands on wafers, driving sudden defectivity excursions well before the ring is fully consumed.
Erosion of seating faces, surface contamination or deposit build-up can degrade the electrical and thermal contact between the ring and its support. The result is shifting RF coupling, unstable plasma, raised reflected power and uneven edge temperature, all of which compromise process repeatability.
The outer electrode ring is replaced during scheduled preventive maintenance or when edge metrics and particle data indicate end of life. Because it is a brittle ceramic carrying RF, handling cleanliness and seating integrity are paramount. Always follow the relevant LAM maintenance procedure and site safety protocols.
Edge electrode rings are recurring consumables, so holding qualified second-source stock protects both budget and uptime. ESCT Fab Support supplies the ES2099-043 outer electrode ring as a verified alternative to the OEM part, supporting a resilient spares programme.
It is the outermost conductive ring of the electrode assembly, extending the powered surface and RF coupling beyond the wafer edge. By stabilising the plasma sheath and shaping the field at the periphery, it controls edge etch uniformity and helps maintain a clean, symmetric discharge.
No. This is supplied as a new, second-source part that is compatible with LAM OEM P/N 839-020965-005. It is verified to the form, fit and function of the original component but is not an original OEM part and is not sold as one.
SiC offers a strong combination of plasma-erosion resistance, high purity, useful electrical conductivity and high thermal conductivity. That lets the ring carry RF, survive aggressive etch chemistries, manage edge heat and keep particle generation low, the exact mix required of a powered edge electrode.
Replace it when edge etch-rate or critical-dimension uniformity drifts, when particle counts rise, or when visual inspection shows substantial thinning, pitting or cracking. Most fabs tie replacement to a PM interval based on accumulated RF hours, then confirm against process and defectivity data.
Because the ES2099-043 ring is held to the original dimensions and material characteristics, it is intended to preserve the edge geometry and electrical behaviour the chamber was matched to. As with any consumable change, you should requalify the chamber and verify matching before returning it to production.
The typical lead time is 4–5 weeks, which supports planned PM scheduling and buffer stock. Reorder against ESCT P/N ES2099-043, cross-referenced to OEM P/N 839-020965-005, to keep procurement records consistent.
The Outer Electrode Ring, FLEX45 SiC (ESCT P/N ES2099-043, OEM P/N 839-020965-005) is a high-purity silicon carbide edge electrode for LAM FLEX-class plasma etch chambers. Sitting at the wafer periphery, it extends the powered electrode surface, stabilises the plasma sheath and manages RF return, edge temperature and particle performance across the most uniformity-critical region of the wafer. As a consumable subject to erosion, pitting and contact degradation, it should be replaced on a planned PM cadence and requalified for uniformity and matching. Supplied as a verified second-source alternative with a 4–5 week lead time, it offers fabs a cost-effective, supply-resilient route to maintaining edge yield.
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 839-020965-005. 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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