U.S. team claims stability record for 16.19%-efficient 2D/3D tin perovskite solar cell

Researchers at the University of Toledo, working with teams from the University of Wisconsin-Madison, the National Laboratory of the Rockies, and the University of Colorado Boulder, say they've built one of the most durable tin-based solar cells yet made. This is lab research, not a product you can buy, but it points to where solar panel technology may be headed.

Most solar panels today use silicon, though newer "perovskite" materials are being developed as a cheaper, more efficient alternative. Many perovskite designs rely on lead, which raises environmental concerns. Tin is a safer substitute, but it breaks down quickly when exposed to air and moisture. The new cell tackles that problem by combining a 3D perovskite layer with a thin 2D protective layer built from a chlorine-based molecule. That layer shields the tin from oxygen and water while also improving how the material grows and performs.

The result: a cell that converts 16.19% of sunlight into electricity, competitive with the best tin-based cells made so far, and one that held onto 95% of its performance after more than 1,600 hours in dry air, and 80% after 1,000 hours under continuous light and heat. That's notably longer-lasting than earlier tin perovskite designs.

For homeowners, this doesn't change what's available on the market today. But it's a step toward solar panels that could eventually be both cheaper and less reliant on lead, an option worth watching as perovskite technology moves closer to real-world use.