Wide-band-gap copolymer acceptor material based on perylene diimide and preparation method thereof

The invention discloses a wide-band-gap copolymer acceptor material based on perylene diimide and a preparation method thereof, belonging to the technical field of solar cell materials. The terpolymerorganic solar cell acceptor material based on perylene diimide, porphyrin and thiophene is a random copolymer organic solar cell acceptor material having a D-A structure, and has a general structuralformula as shown in a formula I which is described in the specification. The random copolymer organic solar cell acceptor material having the D-A structure can further be as shown in a formula II anda formula III. The wide-band-gap copolymer acceptor material based on perylene diimide provided by the invention has the advantages of simple molecular structure, a few and simple preparation steps,usage of cheap and easily-available raw materials for synthesis, and good visible light absorption range and a absorption strength. Perylene diimide copolymer molecules in the invention can be processed by using a solution metho