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The Flex45 Inner Electrode (Carbon) is the central graphite cathode element used within the powered electrode stack of the LAM Flex45 plasma etch chamber. Carrying OEM part number 839-044157-031 and offered by ESCT Fab Support under part number ES2099-034, this component sits at the heart of the lower electrode assembly, directly beneath or surrounding the wafer-supporting region, where it shapes the RF-driven plasma sheath and delivers the bias energy that drives directional etching. As an “inner” electrode, it occupies the core radial zone of a segmented electrode design, complementing the outer electrode ring that governs edge behaviour.
Constructed from high-purity, fine-grain graphite, the part is intentionally consumable. Carbon is selected for inner-electrode service in fluorocarbon and oxygen-bearing etch chemistries because it erodes predictably, does not introduce metallic contamination, and behaves as a sacrificial surface that protects more costly chamber hardware. In dielectric and conductor etch applications running on the Flex45, the carbon inner electrode is one of the principal interfaces between the RF generator network and the plasma, making its condition a direct contributor to etch rate, uniformity and particle performance.
Because the inner electrode is continuously exposed to ion bombardment and reactive species, it is treated as a scheduled-replacement consumable rather than a permanent fixture. Maintaining a qualified, dimensionally accurate replacement on hand avoids unplanned chamber downtime and helps holding process windows stable across the life of a wet-clean or preventive-maintenance cycle.
Within the Flex45 lower electrode stack, the carbon inner electrode performs several interdependent roles that together define plasma quality across the central region of the wafer. It is simultaneously an electrical conductor, a plasma-facing surface and a contributor to gas and thermal management within the cathode assembly.
The performance of a carbon inner electrode is dominated by the quality of the graphite from which it is machined. ESCT supplies this part in a high-purity, fine-grain isotropic graphite consistent with the requirements of plasma-facing cathode service.
As a plasma-facing surface, the carbon inner electrode must remain dimensionally and chemically stable across the demanding chemistries typical of Flex45 etch recipes.
Because the carbon inner electrode sits directly in the RF and plasma path over the central wafer region, its physical state translates almost immediately into measurable process outcomes. A worn, contaminated or out-of-tolerance electrode propagates through to etch results and ultimately to device yield.
The dominant wear mechanism is sustained ion bombardment, which steadily sputters and chemically etches the carbon surface. Over time this thins the electrode, changes the local gap geometry and shifts the sheath, gradually degrading uniformity until the part falls outside its qualified thickness window and must be replaced.
As erosion progresses, the carbon surface can roughen and accumulate redeposited polymer films. Differential stress between deposited layers and the graphite substrate eventually causes flaking, releasing particles that land on the wafer and drive defect excursions. Coarse-grain or contaminated graphite accelerates this failure mode.
Repeated thermal cycling under high RF power can induce micro-cracking, particularly where mounting or clamping features concentrate stress. Cracks and degraded contact interfaces raise contact resistance, disturb the RF return path and can cause localised arcing, manifesting as unstable matching, hot spots and inconsistent etch behaviour.
Replacement of the carbon inner electrode should be performed during a scheduled preventive-maintenance window by trained personnel, following the equipment owner’s documented procedures and all applicable safety and ESD precautions. The sequence below summarises good practice for this class of cathode consumable.
Carbon electrodes are recurring consumables, so a disciplined spares strategy protects both uptime and process stability. ESCT Fab Support supplies ES2099-034 as a qualified alternative to the OEM part, giving fabs more control over cost and availability without compromising form, fit or function.
It is the central graphite cathode element of the lower electrode stack. It couples RF bias into the plasma over the inner wafer region, provides an RF return path, and presents a sacrificial carbon surface that shapes plasma chemistry and protects underlying chamber hardware.
No. ES2099-034 is supplied as a 2nd Source NEW, OEM-compatible part. It is manufactured to match the LAM electrode referenced by OEM P/N 839-044157-031 in form, fit and function, but it is not an original OEM-branded component.
Graphite is chosen because it is electrically conductive, erodes predictably under ion bombardment, tolerates high thermal load and introduces no metallic contamination. The carbon surface also contributes species that help balance polymer deposition and passivation in fluorocarbon etch chemistries.
Replacement interval depends on the recipe, RF power and chamber duty cycle, so it is determined by each fab’s erosion data and qualification limits rather than a fixed figure. It is typically scheduled alongside major chamber preventive-maintenance and wet-clean events once thickness or particle metrics approach their limits.
The typical lead time is 4–5 weeks. Because the electrode is a recurring consumable, we recommend holding buffer stock and reordering ahead of planned maintenance windows to avoid unplanned downtime.
Match against the OEM part number 839-044157-031 and our reference ES2099-034. If you have any uncertainty about your electrode-stack configuration, our team can assist with cross-referencing and verification before you order.
The Flex45 Carbon Inner Electrode (OEM P/N 839-044157-031, ESCT P/N ES2099-034) is the central graphite cathode element of the LAM Flex45 lower electrode assembly. As a plasma-facing, RF-coupled consumable, it governs central-zone etch uniformity, ion directionality and particle performance, while serving as a sacrificial surface that protects the rest of the chamber. Supplied by ESCT as a 2nd Source NEW, OEM-compatible part in high-purity fine-grain graphite, it offers a cost-effective, readily planned alternative to the OEM electrode for fabs running Flex45 plasma etch processes.
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 839-044157-031. 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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