Toward 'greener,' inexpensive solar cells

American Chemical Society

Now scientists are reporting in the Journal of the American Chemical Society a new advance toward more practical, greener solar cells made with inexpensive halide perovskite materials. They have developed low-bandgap perovskite solar cells with a reduced lead content and a power conversion efficiency of 15 percent. But further improving the efficiency requires stacking two sub-cells with the top one exhibiting a wide bandgap and the bottom a low bandgap to form a tandem cell. Other teams recently reported low-bandgap cells with about 13.6 percent efficiency. The reduction in lead content and improved efficiency for a low-bandgap cell represent a significant step toward practical, more environmentally friendly perovskite tandem solar cells, the researchers say.

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