Selection of appropriate solvent additives for the preparation of high-performance Cs 2 AgBiBr 6 solar cells

Lewis bases, DMPU, MeIm, and EDA were introduced into the Cs 2 AgBiBr 6 precursor solution as solvent additives. MeIm with moderate D N resulted in dense and uniform Cs 2 AgBiBr 6 films and the corresponding solar cells delivered a PCE of 2.61%.