sustainable photovoltaics

Light microscopy image of nanowires, 100 to 1,000 nanometers in diameter, grown from cesium germanium tribromide (CGB) on a mica substrate. The CGB nanowires are samples of a new lead-free halide perovskite solar material that is also ferroelectric. (Credit: Peidong Yang and Ye Zhang/Berkeley Lab)
A simpler less expensive approach to solar cell manufacturing is also lead free
The future of sustainable solar energy cells: Calcium titanium oxide better known as perovskite