Solar panels have become a defining symbol of the global shift towards clean energy, generating electricity without producing carbon emissions. However, researchers are warning that the rapid expansion of solar power is creating a new environmental challenge: managing millions of solar panels once they reach the end of their operational life.
Experts estimate that by 2050, discarded photovoltaic (PV) panels could generate more than 80 million metric tons of waste worldwide. Without efficient recycling systems, many of these panels could end up in landfills, wasting valuable metals that require significant energy and mining to produce.
A new perspective paper published in Chem Circularity by researchers from New York University (NYU) Tandon argues that advanced chemical recycling methods could provide a sustainable solution. The study highlights hydrometallurgy, a process that uses liquid chemicals to selectively dissolve and recover valuable metals from solar panels at relatively low temperatures. Unlike conventional recycling techniques that rely on extremely high temperatures to melt materials apart, hydrometallurgy is more energy-efficient and allows for cleaner recovery of individual metals.
“Solar panels are the clean energy infrastructure of the future, but sustainability must also include what happens at the end of their lifespan,” said Juanita Hidalgo, assistant professor of chemical and biomolecular engineering at NYU Tandon and co-author of the study.
Current recycling methods mainly recover aluminium frames, glass and copper wiring, while valuable materials such as silver, indium, gallium, tellurium and lead remain difficult and costly to extract. Conventional silicon panels, which account for about 95% of the global solar market, often require strong acids to recover silver, making the process hazardous and expensive.
The researchers found that next-generation perovskite solar cells may offer a more sustainable alternative. Their layered structure allows lead, a key component, to be recovered using hot water instead of harsh chemicals. As the water cools, the lead crystallises into a reusable compound that can be incorporated into new solar cells.
The authors argue that recyclability should be considered from the design stage of future solar technologies. Building panels that are easier to dismantle and recycle would reduce waste, conserve critical materials and support a more circular clean energy economy as global solar deployment continues to expand. – ERMD/TX