Budgeting for a used sputter system: the cost drivers

A used sputter system is one of the most common purchases for a research cleanroom, and one of the easiest to under-budget.

Two tools with the same model name can differ widely in configuration: one may have a single DC magnetron and a rotary pump, another four sources with RF and DC supplies, a cryopump, a load lock and substrate heating. The purchase price reflects some of that, but much of the cost sits in what surrounds the tool. This guide walks through the cost drivers so you can build a budget that survives the first year. We do not quote prices here, because they depend too much on configuration and condition, but the structure applies to any refurbished sputter tool.

Start with the films, not the chamber

The configuration you need follows from the films you will deposit. Write down:

• The metals and dielectrics, and whether any are magnetic (magnetic targets need suitable magnetrons)
• Whether you need co-sputtering or multilayers without breaking vacuum
• Reactive processes, such as nitrides or oxides made with N2 or O2
• Substrate size, and whether you need heating, bias or rotation
• Film thickness uniformity requirements across the substrate

Conductive targets can run on DC power. Insulating targets such as SiO2 or Al2O3 need RF power, or pulsed DC for some reactive processes. Each extra source and supply adds cost, both in the tool and in the targets you will stock.

Once the film list is fixed, you can tell whether a compact research system such as the Kurt J. Lesker PVD 75 is enough, or whether you need something larger. Production cluster tools exist on the used market too, but they bring 200 mm handling, high facilities demand and software complexity that few research labs want.

Vacuum system: the largest hidden variable

Base pressure determines film purity, and the vacuum system is where used tools differ most in condition.

Common configurations combine a backing pump with a turbomolecular pump or a cryopump. Each has its own cost profile:

• Turbo pumps are compact and quick to start, but bearings wear and a failed turbo is an expensive repair. Ask for the run hours and the last service date.
• Cryopumps give high pumping speed for water vapour, but need a helium compressor, cooling water and periodic regeneration. Compressors and cold heads need scheduled maintenance.
• Backing pumps are often oil-sealed rotary vane pumps on older tools. Converting to a dry pump avoids oil backstreaming and oil changes, at an added up-front cost.

Gauges, valves, the gate valve and the chamber seals add to this. A used tool whose vacuum system has not been serviced may need several of these items at once. Our vacuum system refurbishment covers the pump, valve and gauge work that typically comes up.

Power supplies and sources

Magnetron guns, shutters and power supplies are the core of the process, and the second big cost driver.

Check each gun for water leaks, cracked insulators and magnet condition. Check each power supply across its range, including the arc handling on DC supplies and the match on RF supplies. A tool listed with "four sources" may have four guns but only two supplies, with a switch box between them. That works, but it rules out co-sputtering from more than two targets at once.

If a supply is missing or faulty, replacement units are available from several makers, but lead times vary. It is worth knowing which supplies are original and which have been swapped in over the years, because controller integration differs.

The controller itself is the last item in this group. Many older research sputter tools run on a PC with an operating system that is no longer supported, or on a programmable logic controller with a small touch panel. Neither is a problem while it works, but replacement hardware can be hard to find. Ask what the controller is, whether recipes and logs can be exported, and whether a spare PC or a disk image exists. If not, a controller update is a reasonable line to hold in reserve rather than spend on day one.

Consumables: targets, shields and gases

Consumables are easy to forget and can add up quickly in the first year.

• Targets. Budget for at least one target per material, plus a spare for the materials you use most. Precious metal targets are a significant line on their own. Bonded targets cost more than unbonded ones but cool better.
• Shields and liners. Deposits build up on chamber shields and need regular cleaning or replacement. Ask whether a spare set comes with the tool, because swapping shields keeps downtime short.
• Process gases. Argon at minimum, plus nitrogen and oxygen for reactive work. Check gas purity requirements and whether your building already supplies these at the right pressure.
• Seals and small parts. O-rings, viewport glass and crystal monitor sensors if fitted.

Installation and facilities

The cost of getting the tool running in your room is often similar in scale to a major refurbishment item, and it is sometimes left out of grant budgets entirely.

Typical facilities for a research sputter system, depending on configuration:

• Three-phase power, sized for the pumps, heaters and power supplies
• Cooling water for magnetrons, pumps and the cryo compressor if fitted
• CDA or nitrogen for pneumatic valves
• Process gas lines with regulators and, for some gases, a gas cabinet
• Exhaust for the backing pump
• Floor space with access for target changes and service

Rigging, crating and transport sit on top of this. Plan the route from loading dock to cleanroom, including door widths and floor loading. Our hook-up and facilities page lists what we survey before installation and what you need to have in place.

The first-year budget, line by line

A budget that holds up usually contains these lines:

1. Purchase price for the tool at the condition grade you choose
2. Refurbishment scope, if not included (vacuum, sources, controller)
3. Crating, transport and rigging
4. Facilities work in your building
5. Installation, commissioning and acceptance
6. Operator training
7. Targets, shields and gases for the first year
8. A contingency for parts that fail in the first months

The contingency matters most for As-is or Inspected tools. For Refurbished and Certified tools, the seller has already replaced the known wear parts, so the contingency can be smaller. Either way, asking for each line separately in a quote lets you compare offers on equal terms.

What we can do

We refurbish and install research sputter systems from our deposition range, including vacuum system rebuilds, source and power supply testing, and full facilities hook-up. Send us your film list and substrate size, and we will propose a configuration, list what a used tool would need, and quote each line separately so your budget is complete.