Solar energy is becoming ever more widespread, with panels going up not only on houses and office buildings, but on cars, buses, and road signs. The latest advancement in solar technology will put solar energy on another new and somewhat unexpected surface: people. Not directly on us, though, on our clothes.
Scientists are developing wearable energy-smart ribbons that can be woven into fabric, with miniature solar cells to capture and store the sun’s energy.
The solar cells don’t look anything like the ones we’re used to seeing on houses or cars. What we can see is a thin copper ribbon, or filament, that has perovskite solar cells on one side and a layer of material acting as a supercapacitor on the other. The copper serves as a shared electrode, directly transferring and storing the charges generated by the perovskite.
Most existing solar cells are made of silicon, which requires silica rock to be converted to silicon crystals using ultra-high temperatures. Perovskite is a crystalline material that can be processed in a lab at room temperature for about half the current cost of silicon panels. Perovskite also has a more flexible structure and higher theoretical conversion efficiency than silicon.