Key Takeaways
- Researchers have developed solar cells from melted moon dust, or ‘moonglass,’ integrated with perovskite crystals.
- The prototype solar cells achieved around 12% efficiency, with potential for higher outputs in future designs.
- This innovation could reduce reliance on Earth-supplied materials and pave the way for sustainable lunar bases.
Innovative Solar Cells from Lunar Regolith
Researchers are exploring the possibility of constructing solar cells on the moon using materials found directly on its surface, known as lunar regolith. The proposal aims to establish lunar bases powered by solar energy harnessed from moon dust, significantly decreasing the need to transport materials from Earth.
Felix Lang from the University of Potsdam in Germany spearheaded the project, motivated by the idea that creating such technology on-site could be more efficient. Over the past two years, his team has successfully built and tested solar cells incorporating moon dust and halide perovskite crystals. These crystals contain lead, bromine, iodine, and long organic molecules.
To fabricate these solar cells, researchers heated a synthetic version of lunar regolith to create a material termed ‘moonglass.’ This moonglass serves as a base layer upon which the perovskite is applied. Although the resulting solar cells are less transparent than standard ones due to the lack of purification, the team achieved an efficiency of approximately 12%. In contrast, conventional perovskite solar cells can reach efficiencies near 26%. Despite current limitations, Lang’s simulations suggest that future prototypes may reach that benchmark.
Experts agree that perovskite solar cells present a promising alternative to traditional silicon cells, both on Earth and in space scenarios, due to their lightweight and efficient nature. Lang estimates that producing a solar cell covering an area of 400 square meters would require only about 1 kilogram of perovskite, marking a compelling advantage for lunar applications.
A key aspect of this research is that it avoids the need for extensive purification processes of lunar regolith, which can complicate manufacturing. Instead, a large curved mirror can focus sunlight to create enough heat to melt regolith into moonglass. Initial tests on a university rooftop showed potential for this technique, indicating it could lead to practical applications on the moon.
As Nicholas Bennett of the University of Technology Sydney notes, this is a pioneering instance of producing solar cells from moonglass, overcoming challenges faced by previous studies that aimed for transparent glass from lunar regolith. The next critical step for the team will be scaling up the production of moonglass beyond laboratory settings. Successfully establishing this melting technology could also facilitate the creation of additional useful items for lunar habitats, such as tiles.
Michael Duke from the Lunar and Planetary Institute emphasizes the necessity of technological advancements to operationalize the manufacturing process, ranging from regolith excavation to assembling solar cell arrays. Establishing a solar cell factory on the moon could revolutionize space-based energy systems, potentially allowing satellites and other equipment to utilize moon-derived solar cells, which would be cheaper to launch due to lower energy requirements.
Moving forward, Lang and his team are focusing on enhancing the efficiency of their solar cells. One area of exploration involves using magnets to extract iron from the regolith prior to the melting process, which could lead to improved quality in moonglass production. Moreover, the team is already looking beyond the moon, contemplating whether similar methods could be applied to Mars regolith in future explorations.
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