Researchers from the University of Warwick and the National Research Council of Canada have achieved a record-setting milestone in semiconductor technology using germanium-on-silicon chip structures. The team engineered a nanometer-thin germanium layer on silicon under compressive strain, allowing electric charges to move faster than in any previously silicon-compatible material.
This breakthrough could pave the way for faster, cooler, and energy-efficient electronics while enhancing the prospects of silicon-based quantum devices.
Why Germanium is Making a Comeback
Silicon has been the backbone of semiconductor devices for decades, but as components shrink, they generate more heat and approach performance limits. Germanium, a material used in the first transistors in the 1950s, offers superior electrical properties while remaining compatible with existing silicon manufacturing techniques.
Dr. Maksym Myronov, Associate Professor at the University of Warwick, explained, “Traditional high-mobility semiconductors like gallium arsenide are expensive and hard to integrate. Our compressively strained germanium-on-silicon (cs-GoS) quantum material combines record mobility with industrial scalability, a key step for practical quantum and classical circuits.”
Engineering the Record Mobility
The researchers grew a thin germanium layer on a silicon wafer and applied precise compressive strain. This process produced an exceptionally pure and orderly crystal structure that allows electrical charge to flow with minimal resistance.
Tests revealed a hole mobility of 7.15 million cm²/V·s, compared to roughly 450 cm²/V·s in standard industrial silicon. This massive improvement could enable chips that operate faster, consume less power, and run cooler—critical for AI accelerators, data center servers, and next-gen electronics.
Impact on Quantum and Next-Gen Devices
Dr. Sergei Studenikin from the National Research Council of Canada highlighted that this sets a new benchmark for charge transport in group-IV semiconductors. The discovery is relevant for:
Quantum information systems and spin qubits
Cryogenic controllers for quantum processors
Energy-efficient AI accelerators
Large-scale integrated circuits compatible with silicon
The development strengthens the UK’s leadership in advanced semiconductor materials research and positions germanium-on-silicon technology as a practical route for future high-performance devices.
Journal Reference: Maksym Myronov, Alex Bogan, Sergei Studenikin. Hole mobility in compressively strained germanium on silicon exceeds 7 × 10⁶ cm²V⁻¹s⁻¹. Materials Today, 2025; 90: 314.
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