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The Suppression Electrode (AMAT OEM P/N 0020-84523) is a precision extraction-optics component fitted to the ion source and front-end beamline of Applied Materials ion implanters in the XR80 and 9500-class families. It sits in the triode or tetrode extraction stack immediately downstream of the arc-chamber exit aperture, between the plasma (source) electrode and the grounded electrode. Held at a strong negative potential relative to ground, the suppression electrode performs the single most important electron-management task in the extraction region: it stops secondary and backstreaming electrons from being accelerated back into the ion source, where they would otherwise dissipate energy, perturb the plasma and degrade extracted beam quality.
In an extraction system, ions are pulled from the source plasma by the field between the source electrode and the grounded electrode. The high-energy ion beam striking downstream surfaces inevitably liberates secondary electrons. Without intervention, the same field that extracts the positive ions would accelerate those electrons in the reverse direction, back through the extraction gap and into the arc chamber. The suppression electrode, biased a few hundred to a few thousand volts negative, creates a local potential barrier, a saddle in the on-axis potential, that reflects these electrons and confines them to the beam-plasma region, allowing space-charge neutralisation to proceed correctly.
Because it defines part of the electrostatic lens that shapes the extracted beam, the suppression electrode is both an electron mirror and a beam-optics element. Its aperture geometry, alignment and surface condition directly influence beam divergence, emittance and transmission to the analysing magnet. As a component exposed to ion bombardment, sputtered deposits and thermal cycling in high vacuum, it is a recognised consumable that must be inspected and replaced on a defined maintenance interval.
Within the extraction assembly the suppression electrode performs several interlinked electrical and optical functions that together govern how cleanly and efficiently ions are drawn from the source:
The suppression electrode is operated at a substantial negative bias supplied through a dedicated suppression power supply, isolated from the main extraction potential. The electrode must hold this voltage cleanly across the vacuum gap without breakdown, arcing or excessive leakage current. Its surface finish, edge radii and dimensional accuracy are therefore critical to managing local field stress.
Intercepted beam fringe and electron currents heat the electrode, while the surrounding region runs at high vacuum and elevated source temperatures. The electrode material must retain its dimensions and resist outgassing so that the extraction geometry remains fixed as the source warms to operating conditions.
A worn, contaminated or misaligned suppression electrode does not merely reduce beam current; it destabilises the entire front end and propagates into implant dose accuracy and uniformity:
Ions and electrons intercepted at the electrode edge gradually sputter the aperture, enlarging and roughening it. As the geometry drifts from specification the extraction lens changes, beam divergence rises and the suppression barrier weakens, eventually demanding replacement.
Sputtered source material and dopant residues accumulate on the electrode surfaces. These conductive or particulate deposits promote field enhancement, micro-arcing and intermittent shorts, and flakes can bridge the extraction gap, causing sudden high-voltage breakdown events.
Repeated vacuum arcs pit the electrode and can carbonise nearby insulators, raising leakage. Sustained thermal loading may warp the electrode or shift its mounting, breaking concentricity with the source and ground electrodes and degrading hold-off voltage.
Replacement is performed during scheduled source preventive maintenance, with the extraction high voltage isolated and locked out and the source vented to a controlled atmosphere. Observe the following sequence and always follow the applicable AMAT service procedure for the specific tool:
Because the suppression electrode is a wear item whose condition directly affects beam stability and uptime, fabs benefit from holding qualified spares rather than waiting for an extraction fault. ESCT Fab Support supplies this electrode as a form-fit-function alternative, helping reduce reliance on extended OEM lead times:
It is held at a negative bias in the extraction stack to create a potential barrier that reflects secondary and backstreaming electrons, stopping them from being accelerated back into the ion source while the positive ion beam is extracted forward.
No. This is supplied as a new, OEM-compatible component verified to the form, fit and function of AMAT OEM P/N 0020-84523. It is not an original OEM part and carries the ESCT reference ES227-0115.
Typical indicators are rising or erratic suppression current, more frequent extraction high-voltage trips, falling beam transmission, and visible aperture erosion, deposits or arc pitting found during source preventive maintenance.
It sits in the extraction optics at the front end of the beamline, between the source (plasma) electrode and the grounded electrode, immediately downstream of the arc-chamber exit aperture.
The standard lead time is approximately 2.5 weeks. Holding the part as a qualified spare is recommended so that source PM and unplanned extraction faults can be addressed without waiting.
When the electrode is verified to OEM form, fit and function and installed with the correct gaps and concentric alignment, it restores the original extraction geometry and electron suppression behaviour, so beam stability and transmission should match the original part.
The Suppression Electrode (AMAT OEM P/N 0020-84523, ESCT P/N ES227-0115) is a critical electron-management and beam-optics component in the extraction stack of AMAT XR80/9500-class ion implanters. By holding a negative bias that reflects backstreaming electrons, it protects the source, stabilises the extraction high voltage and helps maintain clean, well-focused beam transport to the analysing magnet. As a consumable subject to aperture erosion, deposit build-up and arc damage, it should be inspected and replaced on a defined schedule. ESCT supplies a form-fit-function alternative with a short, predictable lead time to keep implanters running with minimal downtime.
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 0020-84523. 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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