Polish Researchers Turn Potato Peels Into Solar Cell Material

Researchers at the Institute of Materials Science and Engineering at Lodz University of Technology are working on photovoltaics made from organic waste, including potato peels.

The team is led by Dr. Piotr Zawadzki. Their approach starts from a simple fact: life is built on carbon, and heavily burnt potatoes are, quite literally, charred carbon. That carbon can be turned into graphene quantum dots. Thanks to their optoelectronic properties, these particles can convert sunlight into electricity, much like conventional silicon solar panels.

Lower efficiency, cheap raw material

The technology has two clear drawbacks. According to the project description, quantum-dot cells are 3 to 4 times less efficient than silicon panels, and they are also less durable.

The researchers argue that this is offset by the raw material. Production does not even need whole potatoes, only peels, which households and food processors throw away anyway. Efficiency is also not the only factor; surface area matters too. The team expects that over time they will be able to develop a photovoltaic paint based on the graphene quantum dots they produce, which could be applied to large surfaces.

Added benefits

The dots could also be combined with classic photovoltaic panels to raise their efficiency. In addition, the material has antibacterial and antistatic properties, which opens up uses beyond energy generation.

The work is still at the research stage, and no commercial timeline has been given. If the technology matures, it could offer a way to turn food waste into a source of electricity, though the lower efficiency and shorter lifespan will have to be addressed first.