The Bosch process explained: deep reactive ion etching in practice
How the Bosch process alternates etch and passivation to cut deep, vertical features in silicon, what limits it, and what to check on a used DRIE tool.
We strip, clean, rebuild and test used process tools to their original specification, so a second-hand etcher, aligner or furnace runs like a known tool in your cleanroom.
Our engineers power up the tool, run its diagnostics and list every fault and worn part they find.
We send a scope with each repair as a line item, and you choose what goes in.
We dismantle the chamber, vacuum and gas systems, clean or replace parts and reassemble to the original drawings.
We leak-check, calibrate and, for Certified tools, run a test process before writing the report.
You receive the report, the parts list and the tool crated or ready for installation.
Strip, clean and rebuild the process chamber, with new seals and a leak-check record.
Learn moreOverhaul pumps, valves, gauges and forelines, and document base pressure and leak-up rate.
Learn moreRemove hazardous process residues from chambers, lines and pumps, with a written statement.
Learn moreRun the refurbished tool on a test process and report the measured results for a Certified grade.
Learn moreA used semiconductor tool usually arrives with a history you cannot fully see: years of process residue in the chamber, pumps run past their service interval, O-rings that have taken a set, and calibration that drifted long ago. Refurbishment is how we turn that into a tool with a known state. We take the platform back to its original specification, replace what is worn, and write down what we did and what we measured.
The service is aimed at university cleanrooms, pilot lines and small fabs that buy 50–200 mm tools second-hand, or that own an older tool and want it back in reliable service. It applies across the process areas we work in: plasma etch and ashing, PVD and CVD, mask aligners and coaters, furnaces and RTP, implanters and wet benches.
Every refurbishment starts with an inspection. We power the tool up where we can, read its logs and diagnostics, leak-check the chamber and walk through the gas, vacuum, RF and motion systems. The result is a fault list with photos.
From that list we write a scope where each repair is a separate line item. Restoring interlocks and safety circuits is always included; other lines are your choice. A teaching lab that needs a reliable tool for one process may skip cosmetic work and options it will never use; a pilot line that needs uptime may want every consumable renewed in one go. We do not publish prices, because the cost depends almost entirely on what the inspection finds and on how easy parts are to source for that platform.
The main cost drivers are:
A refurbishment covers the mechanical, vacuum and electrical state of the tool. It does not change what the tool is: that is the job of an upgrade, such as a new control system or a different wafer size. Scoping both together means the tool is opened only once. How each condition grade is decided is described on how we inspect.
The process chamber is where most wear and contamination sits. We strip the chamber, clean or replace liners, shields, electrodes and showerheads, renew elastomer seals and check heaters, clamps and lift mechanisms. See chamber refurbishment.
Base pressure and leak-up rate decide whether a process repeats. We service or replace roughing and turbo pumps, valves, gauges and foreline components, then document base pressure and leak rate. See vacuum system refurbishment.
Tools that ran toxic or corrosive chemistry must be cleaned before anyone opens them, ships them or installs them. We decontaminate chambers, exhaust lines and pump stacks and issue a written statement for the carrier and the receiving site. See decontamination.
For a Certified grade we run the tool on a test process, measure the result on wafers and put the data in the report, so you start from measured performance rather than a promise. See test and certification.
It helps to send the manufacturer, model and serial nameplate, the process the tool ran, any service records and photos of the chamber, the gas panel and the controller. If you are buying the tool from us, the inspection is already done and the scope options are in the listing or the quote.
An Inspected tool has been powered up and checked against its original specification, and is sold with that report. A Refurbished tool has also had worn parts replaced, been cleaned and been recalibrated to the original specification.
Yes. We can refurbish a tool in your cleanroom, or de-install it for a full strip-down off-site if the scope needs one. The inspection and written scope come first in both cases.
We price from the inspection findings, line by line, so you can see what each repair costs and drop items you do not need. Parts availability for the platform is the largest single cost driver.
We use new, refurbished or compatible parts depending on availability, and the parts list states which each one is. SemiXperts is independent and not affiliated with any equipment manufacturer.
It depends on the platform and how many parts have to be sourced. The quote includes a schedule, and long-lead parts are flagged at the scope stage so they can be ordered early.
How the Bosch process alternates etch and passivation to cut deep, vertical features in silicon, what limits it, and what to check on a used DRIE tool.
Decontamination, de-installation, crating, transport and hook-up. How to plan a semiconductor tool move so it arrives intact and runs again quickly.
When a dry pump conversion pays off on an etcher, CVD tool or evaporator, how to size the replacement and what changes in facilities and interlocks.
Tell us the tool and what you need. We scope the work and send a written offer.