High-Temperature turbomolecular pump upgrade for etch process: extending tool uptime and reducing Total Cost of Ownership

In high‑volume semiconductor manufacturing, equipment uptime and yield improvement is everything.

Even a single unscheduled interruption can disrupt output, increase wafer loss risk, and reduce overall fab productivity.

This case study shows how a high-temperature turbomolecular pump upgrade improved pump durability, reduced deposition build-up, and delivered measurable uptime gains in a display chip manufacturing environment.

Customer situation: reactive maintenance in flat panel display manufacturing

The customer is one of the key players on flat panel display (FPD) market. They were running a reactive service regime on their Edwards turbo molecular pumps (TMP), installed directly in the etch process chambers. These pumps play a crucial role in maintaining stable vacuum conditions essential for metal etch performance.

Due to by-product accumulation and deposition, frequent failures had become a persistent challenge, it reduced equipment utilisation, drove up repair costs, and created customer dissatisfaction at a critical stage in their production flow.

The challenge: Deposition build‑up inside turbo pumps and shortened service life

The process chemistry is rich in aluminium- and chlorine-based compounds, which led to significant by‑product accumulation inside the pumps. While standard visual checks showed little concern, teardown inspections revealed substantial deposits on the inlet, outlet, and especially the Holweck stages of the pumps.

Over time, these contaminants not only reduced pumping efficiency but also increased the probability of premature failure.

Why particle deposition damages turbomolecular pumps

TMPs sit directly in the chamber, therefore collisions between process by‑products and rotor blades can cause damage to the rotor and increase particle counts on the wafer or substrate. In severe cases, these particles can lead not only to expensive TMP repair requirements but also to secondary damage to adjacent equipment components. Both scenarios bring significant risk to factory output. As failures increased in frequency, so did dissatisfaction and scrutiny presenting the potential for competitive displacement if a robust and reliable solution was not swiftly provided.

The Solution: High-Temperature TMP Upgrade

Recognising the urgency, the Edwards team conducted a full analysis of the returned pumps, including material characterisation of the deposits and temperature profiling.

The pump data revealed a clear opportunity: by increasing internal pump temperatures, particularly within the lower Holweck region, it would be possible to substantially reduce condensation and accumulation of aluminium‑chloride by‑products. Although the chemistry itself does not change with temperature, the behaviour of these particles inside the pump does.

A Grapgh showcasing the behaviour of the High-Temperature turbomolecular pump upgrade for etch process

Based on these findings, we recommended upgrading the customer’s existing pumps to a high‑temperature version within the same model series.

This upgrade raised key internal temperature points by 20–30°C, significantly reducing the adherence of process by‑products to internal surfaces. The result was not a change to the customer’s process but an enhancement to pump durability, a drop‑in solution that required no tool requalification or architectural modifications.

Implementation of the high-temperature upgrade in etch tools

Implementation was seamless. Edwards service engineers conducted full inlet, outlet, and Holweck inspections, measuring by‑product thickness before and after cleaning to ensure safe operating margins. The upgraded high‑temperature maglev TMPs were then installed across targeted etch tools, restoring confidence and improving pump performance from day one.

Results: 1.5× increase in pump lifetime

The results were immediate and measurable. The customer experienced a 1.5× increase in pump lifetime, dramatically reducing the frequency of failures and unplanned downtime. With fewer interventions required, the total cost of ownership dropped significantly - aided by lower repair frequency, reduced spare part consumption, and decreased inventory requirements for backup pumps. More importantly, tool uptime stabilised, protecting wafer throughput and ensuring predictable process availability.

Beyond the operational gains, this improvement had a strategic impact. By addressing the source of dissatisfaction and resolving failure issues, we strengthened the customer’s trust in Edwards technology.

These targeted engineering enhancements can deliver meaningful improvements in uptime, durability, and cost efficiency. The customer is now evaluating broader deployment of high‑temperature TMPs across similar applications, this upgrade case is turning a once‑critical challenge into a long‑term reliability advantage.

Frequently Asked Questions

What is a high-temperature turbomolecular pump upgrade?

A high-temperature turbomolecular pump upgrade increases internal operating temperatures within a turbo pump to reduce condensation and accumulation of condensable etch by-products.

In semiconductor etch applications, this approach helps:

Minimise aluminium-chloride deposition

Extend service life

Reduce particle contamination risk

Improve tool uptime

Lower total cost of ownership

Because it can be implemented within the same pump model series, it often serves as a drop-in reliability enhancement.

Why does deposition occur inside turbomolecular pumps during etch?

Deposition occurs when condensable by-products, such as aluminium-chloride compounds, cool and adhere to internal pump surfaces, particularly in the Holweck stages.

How does increasing pump temperature reduce deposition?

Higher internal temperatures reduce condensation of by-products, limiting particle adhesion and buildup inside the turbomolecular pump.

Does a high-temperature TMP require process requalification?

No. In this case, the upgrade was a drop-in solution within the same pump model series and required no architectural modifications.

What is the difference between standard turbomolecular pumps versus high temperature turbopumps in etch

While standard turbomolecular pumps are widely used across semiconductor vacuum processes, etch applications generating aluminium-chloride by-products can benefit from higher pump operating temperatures. High-temperature turbomolecular pumps help minimise condensation within the pump, extending maintenance intervals and supporting stable tool uptime.