GaN Power Amplifiers Demonstrate Superior Radiation Hardness Over Si Devices in Simulated Space Environments

July 19, 2026

IEEE Transactions on Nuclear Science (Conference Proceedings – July 2026) International

Overview

Gallium Nitride (GaN)-based power amplifiers, developed for space applications, have exhibited significantly superior radiation hardness compared to conventional silicon (Si)-based devices under simulated high-energy proton and heavy ion radiation environments. The GaN devices maintained stable electrical characteristics with minimal performance degradation post-irradiation, promising substantial improvements in the reliability of next-generation space communication systems and power converters. This represents a critical technological advancement in spacecraft design.

In Depth

Key Findings

Gallium Nitride (GaN)-based power amplifiers, developed specifically for space applications, have demonstrated exceptional radiation hardness, surpassing conventional silicon (Si)-based devices in simulated high-energy proton and heavy ion radiation environments. This 발표 clearly indicates that GaN devices can provide stable, long-term performance even in the harsh radiation conditions of space, offering the potential to dramatically enhance the reliability and lifespan of next-generation space communication systems and high-efficiency power converters.

Technical Details

The study meticulously evaluated changes in electrical characteristics (e.g., drain current, on-resistance, gate leakage current, gain) of GaN High Electron Mobility Transistors (HEMTs) used in power amplifiers, after exposure to 100 MeV-class protons and heavy ions (iron, xenon). Results showed significantly suppressed performance degradation compared to traditional Si MOSFETs and SiC MOSFETs under equivalent radiation doses. Notably, the devices exhibited robust resistance to single-event effects (SEE), with a low propensity for radiation-induced soft errors or latch-up phenomena. It is believed that GaN’s wide bandgap property and high electron mobility facilitate the recombination of radiation-generated carriers, enhancing the device’s inherent resilience. This demonstrates that GaN devices can achieve superior performance in both Total Ionizing Dose (TID) tolerance and SEE hardness in space environments.

Background & Context

As space missions become increasingly complex and prolonged, electronic components onboard require ever-higher levels of radiation hardness and reliability. Traditional silicon-based devices face risks of performance degradation and failure due to radiation, often necessitating redundant designs or costly radiation-hardened packaging. GaN technology, with its superior electrical properties (high power, high efficiency, high-temperature operation) coupled with intrinsic radiation hardness, has long been anticipated for space applications. The findings of this research mark a crucial milestone, confirming GaN’s potential to fulfill these expectations and provide a new viable option for spacecraft system design.

Strategic Significance & Outlook

GaN-based power amplifiers are expected to be adopted across a wide range of space applications, including transponders for communication satellites, power delivery systems for deep-space probes, payload electronics for Earth observation satellites, and future lunar/Mars base power infrastructure. The practical implementation of this technology will contribute to faster and higher-capacity space communications, improved power conversion efficiency, and reduction in spacecraft mass and volume, thereby enabling more ambitious space missions. Future work will focus on long-term reliability assessments under a broader spectrum of space environmental conditions and optimization of manufacturing processes for commercialization.

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