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The Inner Top-Plate Cathode Electrode (designated in TEL nomenclature as “CEL, INNER TP (NEST) V2”) is a silicon-based upper-electrode consumable used in Tokyo Electron 300 mm plasma etch process chambers. It is the inner segment of a multi-zone top electrode plate, seated, or “nested”, within an outer electrode ring or carrier so that the two pieces together form the powered or grounded surface that faces the wafer across the plasma gap. As a cathode element, it both shapes the electric field that sustains the discharge and serves as a sacrificial silicon source that influences plasma chemistry directly above the wafer centre.
In a capacitively coupled TEL etcher, the top electrode and the wafer-supporting lower electrode form the two plates of the RF circuit. The inner top-plate cathode occupies the central region of the upper assembly, immediately over the middle of the 300 mm wafer. Because etch behaviour at the wafer centre is notoriously sensitive to local field uniformity, gas residence and electrode condition, this inner segment carries a disproportionate share of responsibility for centre-to-edge uniformity. The “V2” suffix denotes a revised geometry or material specification superseding an earlier release, while the “NEST” descriptor confirms it is the inner fitted member rather than a single full-diameter plate.
As a high-purity silicon consumable exposed continuously to energetic ions and reactive fluorine, oxygen and chlorine species, the inner top-plate cathode is a planned-replacement part. Its condition drifts predictably with accumulated RF hours, and maintaining a calibrated replacement cadence holds process windows stable across a fleet of chambers.
The inner top-plate cathode performs several intertwined electrical, chemical and thermal duties within the upper electrode assembly. It is far more than a passive cover plate; it actively participates in sustaining and shaping the plasma over the central wafer zone.
Performance of an inner top-plate cathode is dominated by the purity, structure and surface finish of its silicon, and by how predictably that surface erodes under plasma exposure. Both attributes are tightly specified because they translate directly into process repeatability.
The cathode is fabricated from high-purity silicon selected for controlled resistivity and very low metallic and mobile-ion contamination. As the plasma sputters and chemically consumes the surface, that silicon participates in the gas-phase chemistry; uniform, low-particle erosion is therefore as important as bulk purity.
The plasma-facing surface finish and the flatness and edge profile of the nesting interface are held to demanding tolerances. These features control how cleanly the inner plate seats against the outer electrode and how the field distributes across the seam between the two members.
Because the inner top-plate cathode governs the field and chemistry over the wafer centre, its condition propagates directly into measurable device outcomes. A worn, contaminated or mis-seated cathode is a frequent root cause of centre-biased process excursions.
As a sacrificial silicon consumable, the inner top-plate cathode degrades through several characteristic mechanisms. Recognising these patterns helps maintenance teams distinguish normal end-of-life from premature failure.
Continuous ion bombardment and chemical attack steadily thin the silicon and widen the electrode-to-wafer gap over the inner zone. As thickness falls, the centre etch rate drifts and selectivity changes, eventually pushing the chamber outside its qualified window and signalling planned replacement.
Non-uniform erosion and redeposition roughen the plasma-facing surface and can build fragile by-product films. These films flake and shed silicon-rich particulate onto the wafer, raising defect counts well before the part is dimensionally exhausted.
Thermal cycling and mechanical stress can crack thinned silicon, while a degraded or contaminated nesting interface raises contact resistance and concentrates the field at the seam. Both conditions promote arcing, which causes pitting, sudden particle bursts and the risk of damage to adjacent electrode hardware.
Replacement should follow TEL maintenance procedures for the specific chamber, performed by trained technicians under appropriate cleanroom and contamination-control discipline. The following sequence summarises good practice for handling this nesting silicon cathode.
Silicon upper-electrode cathodes are recurring consumables, so sourcing strategy has a direct bearing on cost per wafer and chamber availability. ESCT Fab Support supplies this inner top-plate cathode as a verified alternative to single-source OEM procurement.
It is the inner top-plate cathode, the central silicon segment of a TEL upper electrode assembly. It nests within the surrounding outer electrode to form the powered or grounded surface facing the wafer centre, and “V2” identifies the revised design generation.
No. This item is supplied as a new, OEM-compatible second-source component. It is not an original Tokyo Electron part and is not sold as one. It is manufactured and verified to match the original in form, fit and function for use in the applicable TEL chambers.
It shapes the RF field, electrode gap and silicon-driven chemistry over the wafer centre. Its condition therefore strongly influences centre-to-edge uniformity, centre critical dimensions and particle performance.
Typical indicators are drift in centre-zone etch rate or uniformity, rising particle or defect counts, visible thinning or roughening of the silicon, and any signs of arcing or cracking. Most fabs replace it on a scheduled RF-hour basis before excursions occur.
It is made from high-purity silicon with controlled resistivity and a specified surface finish, chosen to limit contamination, support stable RF coupling and erode predictably under plasma exposure.
The standard lead time is approximately 4-5 weeks. We recommend aligning orders with your preventive-maintenance schedule so replacement cathodes are on hand ahead of planned chamber service.
The Inner Top-Plate Cathode Electrode (TEL OEM P/N 2L10-251316-11, ESCT P/N ES7099-219) is the central silicon member of the upper electrode in TEL 300 mm plasma etch chambers. Nesting within the outer electrode, it governs the field, gap and chemistry over the wafer centre and is decisive for centre-to-edge uniformity, profile control and particle performance. As a sacrificial high-purity silicon consumable it wears through erosion, surface roughening and occasional cracking or arcing, making scheduled replacement necessary. ESCT Fab Support offers this V2 cathode as a verified, cost-effective second-source alternative with defined lead times to keep your etch fleet running within 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 Tokyo Electron part number 2L10-251316-11. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Tokyo Electron, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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