The Multi-Million Euro “Dirt” Problem: Why Atomic-Level Purity is the New Business Critical for GAA

In the race toward sub-3nm nodes, Gate-All-Around (GAA) is the undeniable future. It offers superior electrostatic control and the scalability required to keep Moore’s Law alive. Yet, for manufacturing leaders, GAA presents a paradox: the very architecture that drives performance also introduces a new frontier of vulnerability—atomic-level defects.

As we transition from FinFET to GAA nanosheets, the “silent saboteur” in the fab is no longer just dust or particles; it is atomic contamination. For a high-volume fab, this is not just an engineering hurdle; it is a massive financial leak.

Here is the business case for why upgrading to SisuSemi’s Low-Temperature, Ultra-High Vacuum (UHV) technology is a profitability imperative.

The Problem: Yield is the new KPI

With ultra-thin, high-aspect-ratio structures, GAA transistors are hypersensitive to impurities. Residues from etching or oxygen contamination during epitaxy create interface traps and charge scattering centers.

The business impact is direct and painful:

• Yield loss: Defect-driven variability kills dies early, driving up the unit cost per chip
• Margin erosion: Lower binning ratios mean fewer top-performance SKUs available for sale
• Inefficiency: Current cleaning methods (wet clean, plasma) are often reactive or damaging to fragile nanosheets

The solution: “Clean at the core” with SisuSemi

SisuSemi offers a proactive shift from cleaning to atomic-level preparation, utilizing a Low-Temperature, Ultra-High Vacuum (UHV) environment.

Unlike traditional methods that risk oxidation or structural damage, SisuSemi’s technology:

1. Prevents native oxide growth: By minimizing ambient gas interactions
2. Protects fragile structures: The low thermal budget reduces stress and deformation in delicate nanosheets
3. Enhances interfaces: Prepares defect-free surfaces for critical Epitaxy or ALD steps

The business case: A hypothetical ROI model

To visualize the financial urgency, let’s apply these technical benefits to a realistic production scenario for a manufacturer ramping up GAA.

The scenario:

• Production volume: 1 000 wafers per month (wpm)
• Wafer value: €18,000 per processed 3nm/GAA wafer (Estimated industry value for advanced nodes)
• Baseline yield loss: Attributed to interface defects and leakage

1. The yield multiplier

SisuSemi directly targets atomic-level defects to drive “Higher yields”.

If SisuSemi’s technology improves your line yield by a conservative 1%:

• Recovered wafers: 10 wafers/month
• Monthly savings: 10 × €18,000 = €180,000
• Annual impact: €2.16 Million added directly to the bottom line

In a high-stakes GAA ramp-up, where time-to-yield determines market leadership, recovering €21M annually from a single process improvement is a massive competitive advantage.

2. Premium pricing through power efficiency

GAA’s promise is performance-per-watt. However, atomic defects cause charge traps and leakage, counteracting this benefit. SisuSemi enables lower power profiles and tighter performance distributions.

• Business impact: By reducing leakage, you unlock premium Low Power or High Performance bins. Shifting just 5% of your output from a standard bin to a premium bin (e.g., +€50 ASP) generates millions in additional pure-profit revenue annually.

3. Protecting Time-to-Market (TTM)

Delays in yield ramp-up can cost billions in missed contracts. SisuSemi mitigates the risk of early-life failures and defect-related delays, ensuring you hit volume targets with reliable silicon.

Summary of benefits

Conclusion

As we march toward angstrom-scale devices, material purity is now a boardroom issue. SisuSemi’s UHV technology solves what metrology can only diagnose—ensuring that your GAA investment meets its full potential in performance and profit.