Polymer-polymetalate composite ink, and preparation method and application thereof

A photoelectric device comprising a multilayer structure,

• wherein the multilayer structure comprises a cathode electrode, an anode electrode, a photoelectric active layer, and an interface modification layer between the electrodes and the photoelectric active layer,
• wherein the interface modification layer is a compact composite thin film formed from a polymer-polyoxometalate composite ink, the compact composite thin film having a thickness of not greater than about 30 nm, the interface modification layer comprising
• at least one polymer;
• at least one polyoxometalate compound material;
• and
• at least one solvent which is used for forming a disperse system in the form of a uniform fluid together with the remaining components in the composite ink,
• wherein the at least one polyoxometalate compound material comprises any one of or a combination of more than two of molybdenum, tungsten and vanadium,
• wherein the mass ratio of the at least one polymer to the at least one polyoxometalate compound material is 1:1 to 1:3, and
• wherein the concentration of the at least one polymer and the at least one polyoxometalate compound material in the composite material is 0.5 to 20 mg/mL.