“Space Is the New Power Grid”: U.S. Navy-Backed Scientists Push to Patent Breakthrough Tech That Harvests Energy Directly From Orbit

In a groundbreaking development, scientists at the University of Michigan (U-M) have made significant strides in designing more durable solar panels for space missions. Funded by the U.S. Office of Naval Research, these panels utilize organic materials to achieve greater efficiency and longevity compared to conventional polymer-based panels. The implications of this innovation could revolutionize energy harvesting in space by reducing costs and extending mission durations. As they apply for a patent, the researchers continue to refine their approach, potentially paving the way for more sustainable and cost-effective space exploration.

The Heavy Costs of Harvesting Energy in Space

Space missions are notoriously expensive, and the cost of sending materials into orbit remains one of the most significant barriers to exploration. Satellites and spacecraft often rely on solar energy to power their operations once they are deployed. However, unlike Earth-based solar panels, space panels are subjected to intense solar radiation that can severely degrade their performance over time.

Traditional panels made from silicon semiconductors are particularly vulnerable to proton irradiation emitted by the sun. This radiation causes micro-cracks that create electron traps, significantly reducing energy harvesting efficiency. As Yongxi Li, a key researcher in the study, notes, “Silicon semiconductors aren’t stable in space because of proton irradiation coming from the sun.” Over time, these imperfections lead to a marked decline in performance, posing a challenge for long-duration space missions.

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The University of Michigan team has identified that protons cleave side chains in polymer-based panels, creating electron traps that degrade solar cell performance. According to Stephen Forrest, the study’s lead author, “We found that protons cleave some of the side chains, and that leaves an electron trap that degrades solar cell performance.” These challenges underscore the need for innovative solutions to enhance the durability and efficiency of space-based solar panels.

When it Comes to Solar Panels, Organic Don’t Crack

In response to the limitations of traditional materials, the U-M team explored the potential of organic materials for solar panel construction. Their goal was to develop panels that are both lighter and more resistant to the damaging effects of proton irradiation. By using organic photovoltaics, they aimed to minimize the cracking and efficiency loss experienced by conventional panels.

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Li explains, “We tested organic photovoltaics with protons because they are considered the most damaging particles in space for electronic materials.” The results were promising, as the organic panels demonstrated a remarkable resistance to proton-induced damage. Unlike their polymer counterparts, the organic solar cells showed no signs of degradation even after three years of simulated radiation exposure.

The findings suggest that organic solar cells could offer a more durable and efficient alternative for space missions. The absence of damage in organic panels contrasts sharply with the performance of traditional panels, which lost half their efficiency under similar conditions. This breakthrough in material science holds the potential to transform the way we approach energy harvesting in space.

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Scientists Apply for Patent While Continuing Research

Buoyed by their successful experiments, the U-M researchers have filed a patent application for their innovative approach to space solar panel design. They have also partnered with Universal Display Corp, an OLED design company that has licensed the technology and is pursuing a separate patent. This collaboration underscores the commercial viability of the organic panel technology and its potential impact on the aerospace industry.

While awaiting patent approval, the team remains committed to advancing their research. Stephen Forrest notes that improving the longevity and performance of solar panels is an ongoing challenge. One avenue being explored is the concept of “healing” the panels by thermal annealing, a process that involves heating the solar cell to 100°C (212°F) to repair damage.

Forrest acknowledges that while this method has shown promise in laboratory settings, its effectiveness in space remains uncertain. He emphasizes the importance of developing panels that inherently resist damage, highlighting the potential of the organic approach. As research continues, the team is exploring ways to fill proton traps with alternative materials, potentially eliminating the problem altogether.

Future Prospects for Organic Solar Panels in Space Exploration

The study, titled “Radiation hardness of organic photovoltaics,” has been published in the journal Joule, garnering attention from the scientific community. As the U-M team continues their work, they are optimistic about the potential applications of organic solar panels in future space missions. The reduced weight and enhanced durability of these panels could lead to significant cost savings and longer mission durations, making space exploration more feasible and sustainable.

Li, who has taken a position at Nanjing University in China, remains dedicated to investigating both organic and traditional approaches to solar panel design. Meanwhile, Forrest and his team are exploring innovative solutions to the challenges of proton-induced damage. As they strive to perfect their technology, the question remains: How will these advancements shape the future of space exploration and the quest for sustainable energy sources beyond Earth?

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