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The Upper Electrode designated LD-777, Tokyo Electron OEM part number 1810-121988-11, is the top-mounted cathode that forms the powered or grounded ceiling surface of a TEL 300 mm capacitively coupled plasma (CCP) etch chamber. Situated directly above the wafer and opposite the lower electrode that supports the electrostatic chuck, this component defines one half of the parallel-plate gap across which the etching plasma is struck and sustained. It is one of the most heavily plasma-exposed parts in the chamber, sitting at the very heart of the reactive region where process gases are dissociated into the ions and radicals that perform the etch.
As a cathode, the LD-777 is not a passive shield but an active electrical surface. It carries RF energy into the discharge, helps establish the sheath voltage that accelerates ions toward the wafer, and provides a defined return path for the RF circuit. In many TEL configurations the upper electrode also serves as the gas-distribution interface, with the plasma-facing face machined or assembled to deliver process chemistry uniformly across the full 300 mm field. Its surface condition, flatness and electrical integrity therefore have a first-order effect on etch rate, uniformity and on-wafer particle counts.
Because the upper electrode is consumed by continuous ion bombardment and chemical attack, it is treated as a scheduled-replacement consumable rather than a permanent fixture. A worn, eroded or contaminated cathode is one of the most common reasons a chamber drifts out of specification, making a reliable supply of form-fit-function equivalent parts central to keeping an etch tool productive.
Within a TEL 300 mm CCP etch chamber, the LD-777 upper electrode performs several interlocking electrical, thermal and process functions simultaneously. Each depends on the cathode presenting a clean, flat, electrically consistent surface to the plasma:
An upper-electrode cathode is engineered to survive an aggressive plasma environment while remaining electrically and dimensionally stable. Its performance is best understood through the material behaviour of the plasma-facing surface and the way that surface interacts with the etch chemistry.
Cathode materials for TEL etch electrodes are selected for controlled, predictable erosion under fluorine- and oxygen-bearing plasmas and for compatibility with the on-wafer materials being etched. Silicon-based and high-purity ceramic or coated surfaces are common because they erode cleanly without shedding metallic contaminants. A well-matched electrode wears at a uniform, slow rate so that gap geometry and surface chemistry stay within tolerance across many RF hours.
Beyond surviving the plasma, the cathode must transfer RF energy efficiently and shed heat consistently. Stable bulk resistivity and reliable contact at the mounting interface keep RF coupling repeatable, while a defined thermal path prevents local hot spots that would otherwise distort etch rate near the wafer edge.
Because the upper electrode sits directly in the plasma above the wafer, its condition feeds straight through to process results. A degraded or out-of-tolerance cathode shows up quickly in fab metrics:
The dominant wear mechanism is gradual erosion of the plasma-facing surface under continuous ion bombardment and chemical attack. As the face thins and roughens, the electrode gap and sheath conditions shift, etch rate drifts and the component eventually reaches the end of its qualified life and must be replaced.
Polymer and by-product films accumulate on cooler regions of the cathode between cleans. When these films exceed their adhesion limit they flake, releasing particles onto the wafer and driving sudden defect excursions. Surfaces that have lost their original finish trap deposits more readily and shorten the interval between wet cleans.
Cyclic thermal stress, mishandling and over-torqued fasteners can crack brittle electrode material or degrade the mounting interface. The result is arcing, erratic RF coupling, localised burn marks and accelerated, non-uniform erosion that takes the chamber out of specification ahead of schedule.
The upper electrode should be replaced by trained personnel during a planned preventive-maintenance window, following the TEL maintenance procedure for the specific chamber. The sequence below is a general guide and does not replace OEM documentation or site safety rules:
Because the upper electrode is a wear item with a finite RF-hour life, fabs that hold qualified spares avoid scrambling for parts when a chamber drifts out of specification. ESCT Fab Support helps maintenance teams keep TEL etch tools running with a focus on availability, quality and total cost of ownership:
It is the top cathode that forms the upper plate of the parallel-electrode gap in a 300 mm CCP etch chamber. It couples RF energy into the plasma, helps set the sheath and ion energy above the wafer, and in many configurations distributes process gas, directly influencing etch rate, uniformity and particle performance.
No. This item is supplied as a 2nd source, new OEM-compatible cathode. It is manufactured to match the form, fit and function of TEL OEM P/N 1810-121988-11 but it is not an original TEL part and is not sold as one. It is intended as a qualified equivalent for maintenance and spare-parts use.
Life depends on the process chemistry, RF power and duty cycle of your specific recipe, so it is measured in qualified RF hours rather than a fixed calendar figure. Most fabs track erosion and process drift and replace the electrode at a defined limit during preventive maintenance.
Typical indicators are rising particle or defect counts, etch-rate and uniformity drift, unstable RF match or reflected power, visible erosion or burn marks on the plasma-facing surface, and a shrinking interval between wet cleans.
The indicative lead time is 4 to 5 weeks. We recommend holding a qualified spare and aligning reorders with your PM schedule so a replacement is on hand before the in-service electrode reaches its erosion limit.
Handle it only with clean, powder-free gloves in a controlled environment, keep it in its protective packaging until installation, and avoid contact with the plasma-facing surface. Brittle electrode materials require care against impact and over-torque to prevent cracking.
The LD-777 upper electrode (TEL OEM P/N 1810-121988-11, ESCT P/N ES7099-001) is a plasma-facing top cathode for TEL 300 mm CCP etch chambers. It defines the upper electrode gap, couples RF into the discharge, shapes the field above the wafer and serves as a sacrificial surface that protects permanent chamber hardware. Because it erodes and accumulates deposits over its service life, it is a scheduled consumable whose condition directly drives etch uniformity, particle performance and yield. Supplied as a 2nd source NEW form-fit-function equivalent with an indicative 4 to 5 week lead time, ES7099-001 gives TEL fabs a cost-effective, readily reorderable spare for keeping etch tools within their process window.
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 1810-121988-11. 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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