New Aspects of Copper Electrode Metamorphosis in Perovskite Solar Cells
Natalia N. Udalova, Elizaveta M. Nemygina, Elena A. Zharenova, Andrei S. Tutantsev, Alexander A. Sudakov, Aleksei Y. Grishko, Nikolai A. Belich, Eugene A. Goodilin, Alexey B. Tarasov
Abstract
Interaction of a copper electrode with methylammonium polyiodides is studied for the first time at the interfaces imitating hybrid perovskite solar cells. Along with a widely known copper corrosion product—CuI, a new MACu2I3 phase is found. The presence of lead derivatives as well as reaction temperature are shown to have a strong influence on the resulting corrosion products. The interplay between lead- and copper-containing iodides allows revealing either realistic chemical corrosion pathways or possible practical benefits from CuI crystallization and perovskite recovery caused by the copper–iodine chemical “drain” in the system.