Researchers at Northwestern University have developed the first environmentally friendly solar cell with good efficiency. The cells are cost-effective and are made using bench chemistry without the need of hazardous materials or expensive equipment.
This new environmentally friendly cell is made using tin perovskite instead of lead perovskite. The cells are comprised of five different layers – electrically conducting glass, titanium dioxide, tin perovskite, hole transport and a thin layer of gold caps. The five-layered device is approximately one to two microns thick and has been tested under simulated full sunlight and logged a power conversion efficiency of 5.73 percent.