A Novel and Versatile Strategy to Prepare Metal–Organic Molecular Precursor Solutions and Its Application in Cu(In,Ga)(S,Se) 2 Solar Cells

A novel and versatile metal–organic molecular precursor-based solution approach and the fabrication of high efficiency Cu(In,Ga)(S,Se) 2 solar cells are presented. Many types of metal oxides, hydroxides, and acetylacetonates (acac), such as Cu 2 O, ZnO, SnO, Sb 2 O 3, MnO, PbO, In(OH) 3, Cd(OH) 2, Ga(acac) 3, and so forth, can be easily dissolved in butyldithiocarbamic acid, forming thermally degradable metal–organic molecular precursor solutions. By developing a simple and green ethanol solution-processed route and tuning the chemical composition of the Cu(In,Ga)(S,Se) 2 thin film, as-fabricated solar cells exhibit an average power conversion efficiency up to 8.8%.