Coventry, United Kingdom · 5 December 2025Scientists from the University of Warwick and the National Research Council of Canada have reported the highest "hole mobility" ever measured in a material compatible with today's silicon-based semiconductor manufacturing — a breakthrough that could lead to chips that run cooler, faster, and with dramatically lower energy consumption, while also advancing the prospects for silicon-based quantum devices.
Artistic sketch of the fastest charge carrier ever achieved on a silicon wafer using compressively strained germanium-on-silicon (cs-GoS). Credit: Maksym Myronov / University of Warwick## A 1950s Material for 21st Century ChipsGermanium (Ge) appeared in some of the earliest transistors of the 1950s, before silicon (Si) became the dominant semiconductor material. Now, germanium is drawing renewed interest because researchers are finding ways to exploit its superior electrical characteristics while retaining the benefits of established silicon production methods.In a study published in
Materials Today (Vol. 90, 2025), a team led by Dr. Maksym Myronov at the University of Warwick's Department of Physics demonstrated a major advancement: a nanometer-thin germanium epilayer grown on a silicon wafer and placed under precise compressive strain. This engineered structure — called compressively strained germanium-on-silicon (cs-GoS) — enables electric charge to move faster than in any previously known silicon-compatible material.> [!STAT] The cs-GoS material achieved a hole mobility of 7.15 million cm²/V·s, compared to approximately 450 cm²/V·s in industrial silicon — an improvement of more than 15,000-fold. This is the highest hole mobility ever recorded in a group-IV semiconductor compatible with mainstream silicon manufacturing.## How the Breakthrough Was AchievedThe researchers created the material by growing a thin germanium layer on a silicon wafer and then applying a precise amount of compressive strain. This produced an exceptionally pure and orderly crystal structure that allows electrical charge — specifically "holes," the positively charged carriers in semiconductors — to pass through with minimal resistance.Dr. Maksym Myronov, Associate Professor and leader of the Semiconductors Research Group at the University of Warwick, explained the significance:> "Traditional high-mobility semiconductors such as gallium arsenide (GaAs) are very expensive and impossible to integrate with mainstream silicon manufacturing. Our new compressively strained germanium-on-silicon (cs-GoS) quantum material combines world-leading mobility with industrial scalability — a key step toward practical quantum and classical large-scale integrated circuits."The critical advantage is silicon compatibility. Unlike exotic high-mobility materials such as gallium arsenide, which require entirely separate manufacturing ecosystems, the cs-GoS structure can be produced using existing mainstream silicon fabrication processes. This means the breakthrough could be adopted by the global semiconductor industry without requiring a complete overhaul of manufacturing infrastructure.## Implications for Classical and Quantum ComputingThe findings establish a promising new route for ultra-fast, low-power semiconductor components with applications spanning both classical and quantum technologies:| Application Area | Potential Impact ||---|---||
AI accelerators | Faster, more energy-efficient inference and training ||
Data center servers | Reduced cooling demands and lower energy consumption ||
Quantum processors | Platform for spin qubits with long coherence times ||
Cryogenic controllers | Efficient control electronics for quantum systems ||
5G/6G networks | Higher-frequency, lower-power transistors ||
Edge devices | Real-time processing with minimal energy budget |Dr. Sergei Studenikin, Principal Research Officer at the National Research Council of Canada, stated:> "This sets a new benchmark for charge transport in group-IV semiconductors — the materials at the heart of the global electronics industry. It opens the door to faster, more energy-efficient electronics and quantum devices that are fully compatible with existing silicon technology."> [!INSIGHT] The quantum computing implications are particularly significant. The ultra-clean crystal structure of cs-GoS, combined with its high charge mobility, makes it an ideal platform for hosting spin qubits — a leading candidate for building large-scale quantum computers due to their small footprint and potential for long coherence times. If spin qubits can be hosted on silicon-compatible germanium, the path to manufacturing quantum processors using existing semiconductor fabs becomes considerably more realistic.## Context: Overcoming Silicon's Physical LimitsAs silicon components shrink and are packed closer together, they generate more heat and approach fundamental performance limits. The semiconductor industry has been searching for materials and architectures that can extend Moore's Law without requiring entirely new manufacturing paradigms.The Warwick team's approach — using strain engineering to enhance the properties of a material that is already compatible with silicon manufacturing — represents a pragmatic path forward. Rather than replacing silicon entirely, it augments silicon with a thin layer of engineered germanium that delivers dramatically improved electrical performance.This research also complements other 2025 advancements in the field, including work on superconducting germanium and high-purity isotope production, which collectively aim to reduce noise and improve the coherence of future quantum devices.## The UK's Growing Role in Semiconductor MaterialsThe achievement highlights the United Kingdom's growing influence in advanced semiconductor materials research. Warwick's Semiconductors Research Group has been at the forefront of germanium-on-silicon research, building on years of expertise in epitaxial growth and strain engineering.The study, published in
Materials Today (DOI: 10.1016/j.mattod.2025.10.004), represents not only a technical milestone but also a demonstration that university-led research groups can produce materials with world-record properties that are directly relevant to industrial-scale manufacturing.> [!NOTICE] While the hole mobility figure of 7.15 million cm²/V·s was measured under specific laboratory conditions (low temperature), the material's compatibility with silicon manufacturing and its demonstrated performance advantages at room temperature for device applications remain the subject of ongoing research. The transition from record-setting material properties to commercial chip production typically requires years of additional engineering.## Sources- University of Warwick, "A 1950s material just set a modern record for lightning-fast chips," ScienceDaily, December 5, 2025- Myronov, M., Bogan, A., Studenikin, S. "Hole mobility in compressively strained germanium on silicon exceeds 7 × 10⁶ cm²V⁻¹s⁻¹."
Materials Today, Vol. 90, 2025, pp. 314. DOI: 10.1016/j.mattod.2025.10.004- QD-LATAM, "Record-setting charge mobility in germanium-silicon material points to energy-saving quantum chips," December 2025- Electronics For You, "Compressed germanium for high-mobility devices," December 2025
