Quantum Breakthrough Explains Electron-Induced Chip Degradation

New model reveals how single high-energy electrons can break silicon-hydrogen bonds, solving decades-old mystery.

Apr. 20, 2026 at 8:08am

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An abstract, highly structured painting in soft earth tones depicting sweeping geometric arcs, concentric circles, and precise botanical spirals, representing the quantum forces that cause silicon-hydrogen bonds to break and degrade semiconductor performance.A quantum-level visualization of how a single high-energy electron can trigger the breaking of silicon-hydrogen bonds, a process that gradually degrades the performance of electronic devices.Santa Barbara Today

Researchers at UC Santa Barbara have uncovered the quantum mechanism behind 'hot-carrier degradation' in semiconductors, a process that slowly degrades the performance of electronic devices over time. The team identified a previously unknown electronic state that allows a single high-energy electron to weaken and displace silicon-hydrogen bonds, resolving long-standing experimental anomalies and providing a framework for engineering more durable materials.

Why it matters

Modern electronics rely on stable semiconductor materials, but even the most advanced devices suffer gradual performance degradation due to 'hot-carrier' effects. Until now, the precise physical mechanisms behind this process were unknown, limiting engineers' ability to design more reliable components for smartphones, solar cells, medical implants, and other critical technologies.

The details

The researchers focused on the silicon-hydrogen bonds near the silicon-oxide interface in transistors. Hydrogen is intentionally introduced during manufacturing to passivate broken silicon bonds and prevent them from acting as electrical defects. However, when exposed to the flow of electrons, the hydrogen can occasionally detach, re-exposing the broken bonds and degrading device performance. The team's quantum simulations showed this bond-breaking is triggered not by the cumulative impact of many electrons, but by a single high-energy electron briefly occupying a previously unidentified electronic state that weakens the bond and displaces the hydrogen atom.

  • The study was published on April 20, 2026 as an Editors' Suggestion in Physical Review B.

The players

Chris Van de Walle

Professor in the UC Santa Barbara Materials Department and leader of the Computational Materials Group that conducted the research.

Woncheol Lee

Postdoctoral researcher in the Van de Walle lab and first author of the study.

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What they’re saying

“Our results show that the interplay between electrons and nuclei in a highly non-classical regime is what drives bond breaking. This process doesn't fit into the usual picture of heating-induced damage; it's a short-lived quantum event that we can now model without needing to fit it to an experiment.”

— Woncheol Lee, Postdoctoral Researcher

“The quantum framework we developed gives materials scientists a predictive tool to assess which chemical bonds are most likely to break in extreme conditions, thus opening the door to engineering more stable materials with longer lifespans.”

— Chris Van de Walle, Professor

What’s next

The researchers plan to apply their quantum model to other semiconductor materials beyond silicon, with the goal of guiding the development of more durable electronic components for a wide range of applications, from smartphones to solar cells and medical devices.

The takeaway

This breakthrough in understanding the quantum mechanisms behind 'hot-carrier degradation' provides materials scientists with a predictive framework to engineer more reliable semiconductors, addressing a critical challenge that has plagued the electronics industry for decades.