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The Shaped Inner Upper Electrode is the inner-zone segment of the powered upper-electrode (cathode) stack used in 300 mm capacitively coupled plasma etch chambers. As its name suggests, it is a contoured silicon plate occupying the central region of the upper electrode, directly above the wafer centre, where it simultaneously distributes process gas, couples RF energy into the discharge and forms part of the chamber’s reactive surface. The “shaped” profile is not cosmetic: the deliberate contour on the plasma-facing side tailors the local gap and field distribution to compensate for the radial non-uniformities that naturally arise between the centre and edge of a 300 mm wafer.
Within the assembly, the inner electrode sits concentrically inside an outer electrode ring and is mounted to a backing or bond plate that provides clamping, thermal contact and the electrical return path. Process gas is fed through a pattern of fine through-holes machined into the plate, so the part doubles as the inner-zone showerhead. Because it is consumed by the same plasma it helps create, it is a scheduled consumable rather than a permanent structural component.
For a fab, the inner upper electrode matters because it directly governs centre-region etch rate, gas residence time and the centre-to-edge balance of the process. A worn, eroded or clogged inner electrode shows up immediately as a drift in centre etch rate, a shift in within-wafer uniformity and rising particle counts, all of which translate into yield loss long before any catastrophic failure occurs.
The inner upper electrode performs several jobs at once, which is precisely why its condition has such an outsized effect on process stability. Its principal functions include:
Inner upper electrodes of this class are manufactured from high-purity, controlled-resistivity silicon. The purity matters because the plate is in direct contact with the plasma: trace metallic contaminants liberated by ion bombardment become mobile metal contamination on the wafer. Controlled resistivity gives predictable RF coupling, while a consistent crystal grade and surface finish give a uniform erosion rate so the contour and hole geometry degrade gracefully rather than locally.
The shaped profile and the through-hole array are the features that make this an inner-zone part rather than a flat electrode. The contour sets the local gap; the holes set the gas conductance. Both must hold tolerance through installation and thermal cycling, because asymmetric hole erosion or contour wear translates directly into a non-uniform centre etch signature. A well-made part holds its surface flatness and hole edge definition over a meaningful number of RF hours.
Because the inner electrode controls the centre of the wafer, its condition propagates straight into device-level results. The consequences of running on a degraded part include:
The dominant wear mechanism is steady ion-bombardment erosion of the plasma-facing silicon. Over time the contour flattens and the gas holes bore out and round over, increasing conductance locally and softening the engineered field shape. This is normal end-of-life behaviour, but running past the intended RF-hour budget pushes uniformity out of specification and is the most common reason an inner electrode is scheduled for replacement.
In polymerising chemistries, etch by-products redeposit on the cooler regions of the plate and can partially block the finer gas holes. The result is a starved or skewed centre-zone flow, a measurable uniformity shift and a particle risk as the deposited film eventually flakes. Clogging often appears before bulk erosion has reached its limit and is a frequent trigger for wet-clean or swap-out.
Silicon is brittle, so thermal gradients, poor backing-plate contact or mishandling during a swap can initiate cracks that propagate under RF and thermal cycling. Localised arcing, often seeded by a contamination spot or a poor ground contact, leaves pits and craters that disturb the field and shed particles. Both modes can end a plate’s life prematurely and underline the importance of clean, even mounting.
Replacement is a controlled, cleanroom procedure. The following sequence reflects good practice and should always be carried out to the relevant maintenance documentation and lock-out procedures for the specific platform:
Inner upper electrodes are scheduled consumables, so the goal is to never let the absence of a plate gate a chamber. ESCT Fab Support helps fabs keep these parts on the shelf and qualified:
It is the inner-zone segment of the powered upper electrode in a 300 mm plasma etch chamber. It couples RF into the centre of the discharge, feeds process gas through its hole pattern as the inner showerhead, and uses its contoured profile to shape the field and balance centre-to-edge etch performance.
No. This is a second-source new part. It is supplied by ESCT Fab Support as a new, OEM-compatible component verified to the form, fit and function of OEM P/N 716-069688-822, and it is not an original OEM-branded item.
It is machined from high-purity, controlled-resistivity silicon, which is the standard material class for plasma-facing cathode electrodes. The purity protects against metallic contamination and the controlled resistivity keeps RF coupling repeatable.
The usual indicators are a drift in centre etch rate, a shift in within-wafer uniformity, rising particle counts and unstable or reflected RF power. Most fabs replace the plate on an RF-hour or wafer-count schedule before erosion, hole bore-out or clogging push the process out of specification.
The typical lead time is 4-5 weeks. Because inner upper electrodes are consumables, we recommend planning replacements into your maintenance cycle and holding buffer stock so a chamber is never held up waiting for a plate.
Handle it only with clean, powder-free gloves and approved tooling, never touching the plasma-facing surface or the gas holes. Silicon is brittle, so check for even seating against the backing plate and torque fasteners to specification to avoid cracking, arcing or contamination at start-up.
The Shaped Inner Upper Electrode (OEM P/N 716-069688-822, ESCT P/N ES2099-052) is a high-purity silicon inner-zone cathode for LAM 300 mm plasma etch chambers. It couples RF, distributes gas and shapes the field above the wafer centre, making it a primary determinant of centre etch rate, within-wafer uniformity and particle performance. As a scheduled consumable it wears by erosion, hole bore-out, clogging and occasional thermal or arc damage, so keeping a qualified replacement on the shelf is central to maximising chamber uptime and protecting 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 716-069688-822. 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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