0020-86740
LINER END, ANTI CATHODE, SOURCE, 0020-86740

Anti-cathode source liner end (OEM P/N 0020-86740), arc-chamber end liner for AMAT ion implanter source systems

ESCT P/N ES227-0018 · AMAT-compatible source consumable for high-current bernas-type ion sources

The Anti-Cathode Source Liner End, Applied Materials part number 0020-86740, is a refractory end-wall liner that fits inside the arc chamber of an AMAT ion implanter source assembly, immediately surrounding the anti-cathode (repeller) electrode. In a Bernas-style indirectly heated source, the arc discharge runs from a heated cathode at one end of the chamber to the anti-cathode at the opposite end. The liner end is the sacrificial plate or sleeve that lines that opposite extremity, shielding the chamber body and end flange from the dense, high-temperature plasma that forms along the cathode–anti-cathode axis.

Because it sits directly in the path of the confined arc, this component endures some of the most aggressive conditions inside the entire implanter. It is bombarded by energetic ions and electrons, exposed to reactive dopant species such as boron trifluoride, phosphine, arsine and their dissociation products, and subjected to thermal cycling between ambient and operating temperatures well in excess of 800°C. Its role is to take that punishment so the surrounding source body, insulators and vacuum sealing surfaces do not.

For fab engineers maintaining XR80, 9500-class and related AMAT high-current implant platforms, the anti-cathode liner end is a recognised consumable on the preventive-maintenance schedule. Keeping a verified replacement on the shelf means a source rebuild is never delayed waiting for a single end liner, and beam stability is restored to specification with minimal source-life loss.

Functional role of the anti-cathode liner end in AMAT ion source platforms

Within the source arc chamber, the liner end performs several interlinked jobs that together keep ionisation efficient and the surrounding hardware protected. Its specific functions include:

• Lining the anti-cathode end of the arc chamber so the plasma contacts a high-purity sacrificial surface rather than the source body or end flange.
• Providing the electrically and thermally appropriate boundary that surrounds the anti-cathode (repeller) electrode and helps reflect electrons back along the discharge axis.
• Helping to define and stabilise the geometry of the confined arc column, which directly governs ionisation density and extracted beam current.
• Containing sputtered material and dopant deposits so they accumulate on a replaceable consumable instead of contaminating permanent chamber components.
• Maintaining a consistent thermal environment at the cool end of the chamber, limiting condensation of feed material and conductive build-up.
• Acting as a planned wear item that absorbs erosion, simplifying source refurbishment to component swaps rather than chamber-body repair.

Material and process performance

High-purity refractory construction

Source liner ends of this class are manufactured from high-purity, fine-grain refractory materials (typically graphite, and in some source designs tungsten or molybdenum) selected for their stability at incandescent temperatures and their resistance to attack by fluorine-bearing dopant chemistries. Material purity is critical: trace metallic contaminants in the liner can be sputtered into the beam and implanted into the wafer, degrading device yield. Components in this category are accordingly held to tight purity grades.

• High thermal-shock tolerance to survive repeated source ignition and cool-down cycles.
• Low outgassing to protect the source vacuum and shorten pump-down after a rebuild.
• Dimensional stability so the liner–anti-cathode spacing stays within the arc-geometry window.

Process chemistry compatibility

The liner end must remain serviceable across the full menu of implant species. Fluorine released from BF3 cracking is especially corrosive and drives the well-known tungsten transport cycle inside the source; a liner that resists this chemistry helps stabilise source behaviour and extends the interval between rebuilds.

• Resistance to halogen and hydride dopant attack at operating temperature.
• Controlled surface condition to keep sputter and deposition behaviour predictable.
• Compatibility with the surrounding cathode, anti-cathode and chamber-liner consumable set.

Impact on tool performance and yield

Although it is a small consumable, the condition of the anti-cathode liner end has outsized influence on implant results because it shapes the arc and the contamination environment at the heart of the source. A worn or contaminated liner leads to:

• Unstable or drifting beam current that forces frequent re-tuning and threatens dose-uniformity specifications.
• Reduced ionisation efficiency, lowering achievable beam current for high-dose recipes and cutting throughput.
• Higher particle and metallic contamination reaching the wafer, with a direct hit to device yield.
• Shortened source life and more frequent unscheduled source changes, eroding tool availability.
• Glitching or arcing events that can trip the source and interrupt production lots.

Common wear and failure modes

Sputter erosion and thinning

Continuous ion bombardment along the discharge axis steadily sputters material from the liner surface. Over time the liner thins, pits and loses its original profile, altering the arc geometry around the anti-cathode and gradually degrading beam stability until replacement is required.

Deposit build-up and flaking

At the cooler anti-cathode end, sputtered metals and dopant compounds condense and accumulate on the liner. These deposits can grow conductive, create unintended discharge paths and eventually flake off as particles, contaminating the beam and seeding arcing events inside the chamber.

Thermal stress and cracking

Repeated heating to incandescence and cooling to ambient with every source cycle imposes thermal-shock stress. Fine-grain refractory liners can develop cracks or edge chips, which disturb local field conditions and accelerate further erosion at the damaged sites.

Installation and replacement guidance

The liner end is replaced during a scheduled source rebuild on the bench, not in situ. Work should follow AMAT service procedures and be carried out by trained personnel under appropriate safety controls for hazardous dopant residues. A typical sequence is:

• Vent the source, isolate and lock out gas, power and high-voltage supplies, then allow the assembly to cool fully before handling.
• Remove the source from the implanter and transfer it to the rebuild bench, observing toxic-residue handling protocols for arsenic and other dopant by-products.
• Disassemble the arc chamber and remove the worn anti-cathode liner end together with the other source consumables due for service.
• Inspect the chamber body, anti-cathode electrode and sealing surfaces; clean residue and confirm no collateral damage that the liner was masking.
• Fit the new liner end with clean, powder-free gloves, seating it correctly and verifying its spacing relative to the anti-cathode.
• Reassemble the source, reinstall it on the tool, pump down and leak-check the vacuum integrity.
• Run source conditioning and beam-tuning, then confirm beam current, stability and contamination metrics against specification before releasing to production.

Spare parts strategy for AMAT ion source maintenance

Because the anti-cathode liner end is consumed on a predictable cadence, holding verified stock alongside the rest of the source kit is the single most effective way to protect implanter uptime. ESCT Fab Support offers a practical sourcing route:

• Cross-referenced to AMAT P/N 0020-86740 under ESCT P/N ES227-0018 for fast, unambiguous ordering.
• Supplied to form, fit and function so it drops into your existing source rebuild routine.
• A short, indicative lead time of around 2.5 weeks to support planned PM scheduling.
• Cost-effective alternative to sole-source OEM purchasing, easing pressure on spares budgets.
• Backed by ESCT’s focus on AMAT implanter source and beamline hardware, so consumables can be bundled into a complete source-kit order.

Frequently asked questions

What does the anti-cathode liner end actually do?

It lines the anti-cathode (repeller) end of the arc chamber in an AMAT Bernas-type ion source, shielding the chamber body and end flange from the confined plasma while helping to stabilise the arc geometry and contain sputtered deposits on a replaceable surface.

Is this an original AMAT part?

No. This item is supplied as a new, OEM-compatible component cross-referenced to Applied Materials P/N 0020-86740. It is not an original AMAT part and is not sold as one; it is verified to match the original in form, fit and function.

How often should it be replaced?

As a sacrificial source consumable, it is normally replaced at each scheduled source rebuild, with the exact interval set by your implant species, beam current and duty cycle. Fluorine-heavy BF3 work and high-dose recipes tend to shorten the service life.

What material is it made from?

Liner ends of this type are produced from high-purity, fine-grain refractory material such as graphite, or a refractory metal in some source variants, chosen for high-temperature stability, resistance to dopant chemistries and low contamination of the implanted beam.

What happens if I run a worn liner end too long?

Excessive erosion changes the arc geometry and increases particle and metallic contamination, leading to unstable beam current, dose-uniformity excursions, more frequent glitching and ultimately reduced yield and unplanned source downtime.

What is the lead time and how do I order?

The indicative lead time is around 2.5 weeks. Quote ESCT P/N ES227-0018 or AMAT P/N 0020-86740 when ordering, and ESCT can supply it individually or as part of a complete source rebuild kit.

Summary

The Anti-Cathode Source Liner End (AMAT P/N 0020-86740, ESCT P/N ES227-0018) is a high-purity refractory consumable that protects the anti-cathode end of the arc chamber in AMAT ion implanter sources. By absorbing sputter erosion, containing deposits and helping to stabilise the confined arc, it safeguards beam current, contamination control and overall implant yield. Holding a verified replacement on the shelf keeps source rebuilds on schedule and maximises tool availability across XR80, 9500-class and related high-current implant platforms.

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 0020-86740. 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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