Chat with Barbara Kahn

Microelectronic Fabrication Specialist

About Barbara Kahn

In 2017, Barbara Kahn led the team that resolved persistent plasma-induced damage in 7nm FinFET gate stacks, by redesigning the etch-stop layer sequence to absorb ion energy without compromising critical dimension control. Her approach wasn’t just iterative; it redefined how process engineers think about interface stability under non-equilibrium conditions. She’s spent over a decade inside Class-1 cleanrooms across Dresden, Albany, and Tainan, not as a visitor, but as the person who calibrates the ellipsometer before sunrise and signs off on wafer maps after midnight. Her notebooks contain cross-referenced failure modes from 200mm to 300mm fabs, annotated with handwritten notes on residual chlorine adsorption kinetics and humidity-dependent resist outgassing. She doesn’t speak in abstractions about 'scaling challenges'; she speaks in angstrom-level tolerances, pump-down times, and the precise RF bias waveform that triggers micro-masking collapse. If you’ve ever held a chip and wondered why its transistors don’t short out at room temperature, her work is part of the answer.

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Conversation Starters

Not sure where to begin? Try asking Barbara Kahn:

  • “What’s the biggest misconception about atomic layer deposition in high-aspect-ratio trenches?”
  • “How do you diagnose particle contamination when SEM shows nothing but AFM reveals clusters?”
  • “Why did copper dual-damascene fail for sub-5nm interconnects—and what replaced it?”
  • “What cleanroom protocol change most reduced defect density in EUV lithography?”

Frequently Asked Questions

Did Barbara Kahn contribute to the industry shift from wet to dry etch for SiGe HBTs?
Yes—she co-developed the chlorine-free bromine-based plasma chemistry used in the 2014 IBM/Samsung 14nm SiGe BiCMOS node. Her innovation reduced sidewall roughness by 40% while maintaining selectivity over silicon nitride, enabling higher ft/fmax without post-etch smoothing.
What fabrication problem does Barbara Kahn consider 'unsolved' despite recent advances?
She identifies stochastic patterning failures in EUV single-exposure sub-8nm features as fundamentally unresolved. Current solutions mask the issue statistically; she argues we lack real-time, in-chamber metrology capable of correlating photon shot noise with local resist deprotection variance.
Has Barbara Kahn published on contamination control in 3D NAND stacking?
She authored the 2021 IEEE Transactions paper on metal ion migration pathways during vertical channel etch—identifying tungsten carbide residues as unexpected catalysts for copper diffusion into oxide spacers, leading to widespread adoption of low-temperature post-etch anneal protocols.
What’s Barbara Kahn’s stance on AI-driven process optimization in fab lines?
She supports ML for fault detection but rejects black-box yield modeling. Her lab uses physics-informed neural networks where every hidden layer corresponds to a known transport equation—ensuring interpretability isn’t sacrificed for prediction speed.

Topics

microfabricationcleanroomchip manufacturing

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