Gallium Nitride Semiconductors

Gallium nitride, or GaN, is a compound semiconductor used in power converters and radio-frequency electronics. Its wide band gap and favourable electron-transport properties allow devices to withstand strong electric fields while switching rapidly with relatively low energy loss.

Material properties behind its performance

GaN combines electrical robustness with rapid carrier transport, making it suitable for operation at high voltage, frequency and power density.

• Its band gap of about 3.4 eV gives it a much higher critical breakdown field than silicon, allowing it to withstand larger voltages across a thinner layer.
• Its high electron saturation velocity enables charge carriers to traverse a device rapidly, supporting high-frequency operation.
• At an AlGaN/GaN heterojunction, a high-density two-dimensional electron gas can form, providing a highly conductive channel without heavy channel doping.
• Its wide band gap permits operation at higher junction temperatures, although practical performance still depends on heat removal and packaging.

Advantages at device level

These properties allow GaN devices to deliver high power from a small chip while reducing switching and conduction losses.

• A high breakdown field permits thinner drift regions with lower on-resistance for a specified blocking voltage, improving power-conversion efficiency.
• GaN high-electron-mobility transistors, or HEMTs, support high current density and rapid switching, which are valuable in radio-frequency amplifiers and compact power converters.
• Fast switching allows smaller inductors, capacitors and transformers, reducing the size and weight of power-electronic systems.
• High power density creates concentrated heat, so substrate quality, device reliability, thermal management and cost remain important engineering constraints.