Aerospace and Satellite Applications Using Wide Band Gap Devices

Wide Band Gap (WBG) semiconductors are a class of materials with band gaps greater than that of conventional semiconductors such as silicon and gallium arsenide. These materials, such as silicon carbide (SiC) and gallium nitride (GaN), have gained increasing attention in recent years due to their potential to enable significant advances in power electronics and optoelectronics applications. The aerospace and satellite industries, in particular, are exploring the use of WBG semiconductors in various applications to improve system performance and reduce size, weight, and power consumption. In this blog, we will discuss the advantages and challenges of using WBG semiconductors in aerospace and satellite applications.

Satellites can benefit from the use of WBG components in many system applications. (Image source: NanoSatisfi LLC)

Advantages of WBG Semiconductors in Aerospace and Satellite Applications

Some of the main advantages of using WBG devices in the Aerospace and Satellite industries are listed below:

1. Higher operating temperatures: One of the primary advantages of WBG semiconductors is their ability to operate at higher temperatures than conventional semiconductors. This capability allows for the development of power electronics that can operate in harsh environments without the need for additional cooling systems, which can significantly reduce system weight and complexity.
2. Higher efficiency: WBG semiconductors have higher electron mobility and lower on-resistance than conventional semiconductors, which translates into higher power conversion efficiency. This property is particularly useful in applications such as electric propulsion, where high efficiency is critical to reducing mission costs.
3. Higher power density: The high breakdown voltage of WBG semiconductors allows for the development of compact and lightweight power electronics with high power density. This property is particularly important in aerospace and satellite applications where space is limited and weight reduction is critical.
4. Improved reliability: WBG semiconductors have higher thermal conductivity and better radiation hardness than conventional semiconductors. This property makes them more reliable in harsh environments and reduces the risk of failure due to temperature or radiation effects.

Challenges of WBG Semiconductors in Aerospace and Satellite Applications

As with all things, there are tradeoffs associated with the benefits. Here are some of those tradeoffs:

1. Higher cost: The cost of WBG semiconductors is currently higher than that of conventional semiconductors. However, as the demand for WBG semiconductors increases, the cost is expected to decrease, making them more accessible to the aerospace and satellite industries.
2. Limited availability: WBG semiconductors are still in the early stages of development, and their availability is limited. However, many companies are investing in the development of WBG semiconductors, which is expected to increase their availability in the coming years.
3. Reliability issues: While WBG semiconductors are more reliable than conventional semiconductors in many ways, they are not immune to failure. Some studies have shown that WBG semiconductors can experience catastrophic failure due to localized defects or material imperfections.

Applications of WBG Semiconductors in Aerospace and Satellite

There are many aerospace and satellite applications that can benefit from the use of WBG technology, some of which are highlighted here:

1. Power electronics: The high efficiency, power density, and reliability of WBG semiconductors make them well-suited for power electronics applications in aerospace and satellite systems. For example, WBG semiconductors can be used in motor drives, power converters, and voltage regulators.
2. Lighting: WBG semiconductors can be used in lighting systems for spacecraft and satellites. For example, WBG semiconductors can be used to develop high-efficiency, compact, and lightweight LEDs.
3. Sensing and imaging: WBG semiconductors can be used in sensing and imaging systems for aerospace and satellite applications. For example, WBG semiconductors can be used to develop high-sensitivity, high-resolution photodetectors and cameras.

Conclusion

In conclusion, WBG semiconductors have the potential to revolutionize the aerospace and satellite industries by enabling the development of high-efficiency, compact, and lightweight power electronics, lighting, sensing, and imaging systems.