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Scientists design solar-powered roof for greenhouses

UCLA scientists designed a semi-transparent solar greenhouse roof. Yang Yang Laboratory / UCLA


Scientists have created solar roofs for greenhouses, as the world embraces the new field of agrivoltaics, which focuses on the simultaneous use of land for both solar power generation and agriculture.

For example, replacing the glass in greenhouses with solar panels could power the lamps and water controls in the greenhouse, or even the whole farm. But how does one build solar panels that can absorb energy from sunlight without blocking the light that plants need?

Univeristy of Carlifornia – Los Angeles (UCLA) Samueli School of Engineering’s materials scientist Yang Yang and his team have designed just such a device. In a study published today in Nature Sustainability, they explore a new, viable application of solar cells that does not require large plots of land.

The team has developed a strategy for augmenting semi-transparent organic solar cells. These cells rely upon carbon-based materials, as opposed to the inorganic substances in conventional devices.

The investigators incorporated a layer of a naturally occurring chemical called L-glutathione, which is sold as an antioxidant dietary supplement over the counter, and found that the addition extended the solar cells’ lifetime, improved their efficiency, and still allowed adequate sunlight to reach plants in a greenhouse prototype about the size of a small dollhouse.

“Organic materials are uniquely suitable for agrivoltaics because of their light-absorption selectivity,” said Yang, who also has a faculty appointment in bioengineering and holds UCLA’s Carol and Lawrence E. Tannas Jr. Chair in Engineering. “The main drawback that has prevented their widespread use up to now is their lack of stability.”

Organic solar cells tend to degrade more quickly than their inorganic counterparts because sunlight can cause organic materials to oxidize and thus lose electrons. The researchers found that the additional layer of the L-glutathione prevented the other materials in the solar cell from oxidizing, which resulted in the organic cells maintaining more than 80% efficiency after 1,000 hours of continuous use — as opposed to less than 20% without the added layer.

The research team also tracked the growth of common crops including wheat, mung beans and broccoli in two separate demonstrations. One had a transparent glass roof with segments of inorganic solar cells, and the other had a roof made entirely from semi-transparent organic solar cells.

he crops in the greenhouse with the organic solar roof grew more than the crops in a regular greenhouse. The scientists believe this is because the L-glutathione layer blocked ultraviolet rays, which can inhibit plant growth, and infrared rays, which can cause greenhouses to overheat and plants inside to require more water.

“We didn’t expect the organic solar cells to outperform a conventional glass-roof greenhouse,” said Yepin Zhao, the lead author of the research and a UCLA postdoctoral scholar in Yang’s lab. “But we repeated the experiments multiple times with the same results and after further research and analysis, we discovered that plants don’t need as much sunlight to grow as we’d originally thought. In fact, too much sun exposure can do more harm than good, especially in climates such as California’s, where sunlight is more abundant.”

On the heels of these findings, the team has established a startup at UCLA that aims to scale up production of the organic solar cells for industrial use. The researchers said they hope to make environmentally friendly greenhouses that incorporate the organic solar cells commercially available in the future.

The study shows opportunity and promise for incorporating semi-transparent organic photovoltaics into agricultural uses. Rather than installing large solar panels on land, farmers could incorporate these solar panels on top of greenhouses and harvest energy for the greenhouses and other agricultural operations.


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