Perovskite top layer could boost solar to over 30% efficiency and cut overall costs in half
The power conversion efficiency of silicon photovoltaics has been stuck at 25 percent for 15 years but cheap tandem solar cells could affordably boost efficiency. One cost-effective way to improve efficiency is to build a tandem device made of silicon and another inexpensive photovoltaic material, he said. “Making low-cost tandems is very desirable,” McGehee said. …