Toyo Co (TOYO) Corporate presentation summary

Key performance factors for space solar cells

• Efficiency, radiation resistance, and reliability are critical for space solar cell selection.

• End-of-life performance under radiation is prioritized over initial efficiency.

• Cost is less significant due to high launch and mission expenses; reliability is essential.

Comparison of space solar cell technologies

• III-V multijunction cells offer 30–34% efficiency, 90% power retention post-radiation, but are very expensive and have limited supply.

• PERC silicon cells provide 17.4% efficiency, 60% power retention, low cost, and unlimited supply, suitable for short missions.

• HJT silicon cells achieve 20% efficiency, 97% power retention, low cost, and are suitable for medium missions.

• Perovskite single junction cells reach 22% efficiency, 93% power retention, medium cost, and are promising for long missions.

• Perovskite/HJT tandem cells deliver 31.4% efficiency, high radiation resistance, medium cost, and need further qualification.

• Perovskite tandem cells offer 26% efficiency, 84–92% power retention, medium cost, and are suitable for high-radiation missions.

Technical challenges for space deployment

• Space cells must withstand extreme thermal cycling from -185°C to 150°C.

• Stability under solar and UV light, and high vacuum de-gassing, are essential for reliability.

• Radiation resistance is a major challenge, with performance degradation tracked under electron fluence.