Inversion organic solar cell prepared based on ternary low-toxicity solvent system

The invention discloses an inversion organic solar cell prepared based on a ternary low-toxicity solvent system. The solar cell adopts an inversion structure and comprises a substrate, a transparent conductive cathode ITO, a cathode buffer layer, an optical active layer, an anode buffer layer and a metal anode. The optical active layer is prepared based on a ternary environmental protection solvent system so that solvent saturated vapor pressure can be effectively reduced, film roughness can be reduced, contact between the optical active layer and the buffer layers can be enhanced and exciton separating efficiency can be enhanced, and finally photoelectric conversion efficiency of the device can be enhanced, solvent toxicity can be reduced and the solar cell is friendly to the environment.