In power electronics, gallium nitride can help engineers build smaller, faster, and more efficient systems than silicon can support.
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As industries push toward decarbonization and face rising electricity demand from AI infrastructure, GaN is becoming an increasingly important material for next-generation power devices.
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For decades, silicon (Si) has been the foundation of semiconductor technology. However, its physical limits are becoming more visible as designers pursue higher efficiency, greater power density, and faster switching speeds. That gap has increased interest in advanced materials that can support the next wave of progress in power conversion.
Among emerging candidates, Gallium Nitride (GaN) has established itself as a leading wide bandgap (WBG) semiconductor with the potential to reshape modern electronics. In power electronics, GaN devices can switch faster, reduce energy loss, and shrink system size compared with silicon-based alternatives. That combination has made GaN increasingly relevant across automotive, industrial, data center, renewable energy, and consumer applications.1
This article explains the material properties of GaN and how they translate into practical performance advantages in power electronics.
Fundamental Material Properties of GaN
The performance of GaN power devices starts with the material itself. Several core properties explain why gallium nitride is so attractive for power electronics.2
Wide Bandgap
GaN has an energy bandgap of about 3.4 eV, compared with 1.1 eV for silicon. This wider bandgap allows devices to operate at higher voltages, temperatures, and electric fields without breaking down as easily. It also contributes to lower intrinsic carrier concentration and leakage current, helping reduce energy loss during operation.3
High Electron Mobility
GaN-based high-electron-mobility transistors (HEMTs) use polarization effects to create a high-density two-dimensional electron gas (2DEG) at heterointerfaces. Electrons in this channel typically exhibit mobility in the 1500-2000 cm2/V s range, supporting fast charge transport and low on-resistance.
In practical terms, that means lower conduction losses and better high-frequency performance.
High Breakdown Electric Field
GaN has a critical breakdown field of roughly 3.3 MV/cm, compared with about 0.3 MV/cm for silicon. This large advantage allows GaN devices to block higher voltages across shorter distances. As a result, device layers can be thinner, lowering the specific on-state resistance. This is one of the main reasons GaN can maintain strong efficiency at higher voltage ratings where silicon begins to struggle.4
Thermal Stability
The wide bandgap also contributes to excellent thermal stability. GaN devices can operate at higher junction temperatures with minimal performance degradation, reducing cooling requirements and improving reliability in high-power environments.5
GaN vs Silicon vs Silicon Carbide
GaN can't replace every other semiconductor material. Instead, it fits into a broader power-electronics landscape alongside silicon and silicon carbide (SiC); each has distinct strengths.
| Property |
Silicon (Si) |
Silicon Carbide (SiC) |
Gallium Nitride (GaN) |
| Bandgap (eV) |
1.12 |
3.2 |
3.4 |
| Critical Field (MV/cm) |
0.3 |
2.5-3.5 |
3.3 |
| Electron Mobility (cm2/V s) |
1450 |
700-1000 |
1500-2000 |
| Thermal Conductivity (W/m·K) |
150 |
300-490 |
130-210 |
| Switching Frequency |
Low (<100 kHz) |
Medium (100 kHz) |
High (1-10 MHz) |
Silicon remains the most economical option for low-power, cost-sensitive applications. Silicon carbide is especially strong in high-voltage systems above 1200 V, including electric vehicle traction inverters. GaN is particularly effective in the 100 V to 700 V range, where high switching speed, compact size, and improved efficiency are major design priorities.
Key Application Domains
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1. Electric Vehicles (EVs)
GaN is transforming EV power systems, particularly in on-board chargers (OBCs) and DC-DC converters. GaN-based OBCs can achieve efficiencies of 96-98 %, enabling a 30-60 % reduction in system volume.
Recent research in IEEE Transactions on Electron Devices (2026) highlights the development of p-GaN gate structures with threshold voltages exceeding 4 V, improving device safety and reliability for automotive applications.
2. Data Centers and AI Infrastructure
AI-driven data centers are highly energy-intensive, with projections indicating they may account for up to 12 % of U.S. electricity consumption by 2028.6 GaN-based power supplies can reduce energy losses by up to 30 %, enabling higher computational density while lowering cooling requirements.
New Resonant Tunneling Transistor (RTT) architectures based on GaN are now being proposed to merge power conversion with high-speed AI logic processing on a single chip.7
3. Renewable Energy and Consumer Electronics
In solar microinverters, GaN bidirectional switches enable single-stage power conversion, delivering up to 40 % higher power density with efficiencies exceeding 97.5 %. In consumer electronics, GaN has become the benchmark for fast-charging solutions, offering up to 3x faster charging in significantly smaller form factors than silicon-based adapters.8
Outlook and Conclusion
Gallium nitride is gaining attention in power electronics because it addresses several of silicon’s core limitations. Its wide bandgap, strong breakdown field, high electron mobility, and thermal stability support faster switching, lower losses, and more compact system designs.
As manufacturing improves and integration matures, GaN is moving from specialized use cases into broader deployment across automotive, energy, data center, and consumer markets. For engineers working on efficient and scalable power systems, gallium nitride is becoming less of a niche option and more of a practical design choice.
References
- Meneghini M, De Santi C, Abid I, Buffolo M, Cioni M, Khadar RA, et al. GaN-based power devices: Physics, reliability, and perspectives. Journal of Applied Physics. 2021;130(18).
- Musumeci S, Barba V. Gallium nitride power devices in power electronics applications: State of art and perspectives. Energies. 2023;16(9):3894. DOI:10.3390/en16093894, https://www.mdpi.com/1996-1073/16/9/3894
- Rais-Zadeh M, Gokhale VJ, Ansari A, Faucher M, Théron D, Cordier Y, et al. Gallium nitride as an electromechanical material. Journal of Microelectromechanical Systems. 2014;23(6):1252-71. DOI:10.1109/JMEMS.2014.2364251, https://ieeexplore.ieee.org/document/6942177
- Chen C, Liu Y, Zhou X, Li P, Zhang Y, Yang B, et al. 4.11 A/1650 V Sapphire-Substrate GaN MIS-HEMTs with Thin Buffer for Medium-Voltage Power Applications. Micromachines. 2026;17(2):233. DOI:10.3390/mi17020233, https://www.mdpi.com/2072-666X/17/2/233
- Avraham T, Dhyani M, Bernstein JB. Reliability Challenges, Models, and Physics of Silicon Carbide and Gallium Nitride Power Devices. Energies. 2025;18(5):1046. DOI:10.3390/en18051046, https://www.mdpi.com/1996-1073/18/5/1046
- Clancy H. The data center boom threatens climate goals. How to fight back. 2025.
- Liu F, Xue J, Wu G, Yuan J, Yao J, Liu R, et al. Gallium Nitride Semiconductor Resonant Tunneling Transistor. Advanced Science. 2026:e16334.
- Renesas. Renesas Unveils First Bidirectional 650V-Class GaN Switch For Solar Power Inverters, AI Data Centers and More. 2026.
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