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The Mounting Ground Electrode (AMAT OEM P/N 0020-84522) is a precision-machined earth-potential electrode that forms part of the ion extraction optics assembly on Applied Materials ion implanter source ends. In the high-energy, high-vacuum environment immediately downstream of the arc chamber, this component sits at the grounded (0 V) reference position within the multi-electrode extraction stack, where it works in concert with the high-voltage extraction (puller) and suppression electrodes to draw ions from the plasma meniscus and form them into a controlled, well-collimated beam.
As the term “mounting” in its description implies, this electrode does double duty: it both establishes the ground reference for the extraction field and provides the mechanical datum against which the surrounding optics are located and secured. Its aperture, flatness and parallelism relative to the source aperture directly govern the shape of the electrostatic field through which the beam passes, making it one of the more geometrically critical consumables on the source bench.
Because it operates only millimetres from an intensely hot arc chamber and is continuously exposed to sputtered material, stray beam strike and dopant by-products, the ground electrode is a periodic-replacement item. Maintaining a qualified spare on the shelf is central to keeping source preventive-maintenance windows short and beam quality within specification.
Within the extraction optics, the mounting ground electrode is the terminating element of the accelerating field. Ions leave the source aperture, are accelerated across the extraction gap by the high-voltage puller, energy-sorted and confined by the suppression electrode, and finally pass through the grounded electrode aperture as a defined beam at the system reference potential. Its principal functions include:
Extraction ground electrodes for AMAT source ends are manufactured from high-purity, vacuum-compatible conductive material, typically refractory or high-grade metallic stock selected for low outgassing, dimensional stability at elevated temperature and resistance to sputter erosion. Material purity matters directly to process integrity: any sputtered atoms liberated from the electrode surface can become an unintended contaminant in the implant, so only low-contamination grades are appropriate.
The performance of the electrode is dominated by the precision of its aperture and mounting faces. The bore diameter, edge finish, flatness and parallelism to the source and suppression apertures determine how cleanly the electrostatic lens terminates the beam. Small departures from specification distort the field and degrade beam transmission, so machining tolerances and edge condition are held tightly.
Because the ground electrode terminates the extraction field, its condition propagates directly into beam quality and, ultimately, into device yield. A worn, eroded or misaligned electrode does not fail in isolation, it changes the optics seen by every wafer processed until it is replaced. Typical consequences include:
Continuous bombardment by stray ions and energetic neutrals gradually sputters material from the aperture edge and electrode face. Over time the bore enlarges and edges round off, altering the extraction field and reducing the precision of beam formation. This is the dominant, expected wear mechanism and the primary reason the electrode is treated as a scheduled-replacement consumable.
Dopant species and sputtered material redeposit on the electrode as films and crusts. As these build up they can bridge clearances, distort the field, and eventually flake away to generate particles that contaminate the beamline or trigger high-voltage events. Heavy deposition is a clear indicator that the electrode has reached the end of its useful service period.
Repeated high-voltage arcing across the extraction gap pits the electrode surface, while thermal cycling near the hot arc chamber can warp thin sections and disturb flatness. Pitting and distortion both compromise alignment and accelerate further breakdown, so an electrode showing localised melt marks or visible bowing should be retired rather than re-fitted.
Replacement is normally carried out during scheduled source preventive maintenance by trained personnel following the appropriate AMAT service procedure and site safety rules. The following sequence is a general guide and does not replace the OEM documentation:
Extraction optics are wear-driven, so the economic question is not whether the ground electrode will need replacing but whether a qualified spare is on the shelf when it does. Sourcing this electrode through ESCT Fab Support gives maintenance teams a dependable alternative to single-channel OEM procurement:
It is the earth-potential element of the ion extraction optics. It establishes the 0 V reference that defines the extraction field, shapes the downstream edge of the electrostatic lens, sets the final aperture geometry and serves as the mechanical mounting datum for the surrounding electrodes.
No. This electrode is supplied as a new, OEM-compatible part referenced to AMAT P/N 0020-84522. It is verified to match the original in form, fit and function, but it is not an original Applied Materials branded component.
Typical indicators include falling beam current or transmission, increased high-voltage glitching, drift in beam profile or dose uniformity, and visible aperture enlargement, heavy deposition or arc pitting at the next source PM. Most sites replace it on a scheduled interval rather than waiting for failure.
It is produced from high-purity, vacuum-compatible conductive material chosen for low outgassing, sputter resistance, electrical conductivity and dimensional stability at the elevated temperatures found close to the arc chamber. Purity is important because sputtered atoms can otherwise become process contaminants.
The indicative lead time is approximately 2.5 weeks. Confirming current availability with ESCT before a planned maintenance window is recommended so the spare is on hand when the source is opened.
No. Because the electrode directly affects extraction optics, any replacement should be followed by alignment verification, high-voltage conditioning and beam re-qualification, checking beam current, profile and uniformity, before the tool is returned to production.
The Mounting Ground Electrode (AMAT P/N 0020-84522, ESCT P/N ES227-0080) is a precision earth-potential element of the ion extraction optics on Applied Materials implanter source ends. It defines the ground reference and final aperture of the extraction lens while serving as the mounting datum for the electrode stack, making it directly responsible for beam quality, dose uniformity and high-voltage stability. As a sputter-driven consumable it is best managed as a planned spare, and ESCT Fab Support offers a verified, cost-effective alternative with an indicative 2.5-week lead time to keep source PM windows short and predictable.
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 Applied Materials part number 0020-84522. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.
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