Organic photoactive layer composite ink, organic solar cell and preparation methods thereof

An organic photoactive layer composite ink, comprising

• an electron donor material,
• an electron acceptor material,
• an organic solvent, and
• an organic amine compound,
• wherein the mass ratio of the electron donor material to the electron acceptor material is 5:1 to 1:5,
• wherein the concentration of the electron donor material or the electron acceptor material is 5 to 20 mg/mL,
• wherein the organic amine compound comprises an organic amine compound having a structure as shown in any one of Formulas (1), (2), (1-1), (2-1), and (4)-(8):
• wherein, R1, R2, R3, R4, and R9 comprise hydrogen, substituted or unsubstituted C1 to C20 alkyl, C1 to C20 heteroalkyl, or substituted or unsubstituted modified aromatic or heteroaromatic π conjugated unit derivatives;
• R5, R6, R7 and R8 comprise hydrogen, substituted or unsubstituted C1 to C20 alkyl, C1 to C20 heteroalkyl, substituted or unsubstituted modified aromatic or heteroaromatic π conjugated unit derivatives, or a five or six membered cyclic structure formed by connecting any two substitution units in R5, R6, R7 and R8,
• wherein the electron donor material comprises any one or a combination of two or more of poly(3-hexylthiophene), PTB7, PTB7-Th, PffBT4T-2OD, COOP-4HT-BDT, and structure variants thereof,
• wherein the electron acceptor material comprises any one or a combination of two or more of a fullerene electron acceptor material, a fullerene derivative electron acceptor material and a non-fullerene electron acceptor material, and
• wherein the mass of the organic amine compound is 0.01 wt % to 0.2 wt % of the total mass of the electron acceptor material and the electron donor material that comprises any one or a combination of two or more of PTB7, PTB7-Th, COOP-4HT-BDT, and structure variants thereof, or the mass of the organic amine compound is 1 wt % to 5 wt % of the total mass of the electron acceptor material and the electron donor material that comprises any one or a combination of two or more of poly(3-hexylthiophene), PffBT4T-2OD, and structure variants thereof.