Cigs-perovskite solar cell efficiency creeps toward 25 percent

Researchers at the Helmholtz-Zentrum Berlin (HZB) have developed a CIGS-perovskite tandem thin-film solar cell with an efficiency of 24.6 percent, beating their own world record of 24.2 percent set in 2020. The team made the cell with a contact layer, an intermediate layer of aluminum-doped zinc oxide, an ultra-thin perovskite layer, an indium-doped zinc oxide layer, and an anti-reflective coating. “By improving the contact layers between the top and bottom cells, they were able to increase the efficiency,” a press release clarifies. The cell’s record efficiency was certified by the Fraunhofer Institute for Solar Energy Systems. The HZB researchers are confident that they raise “much higher” efficiencies, “probably more than 30 percent.”