Bulk heterojunction organic thin-film solar cell and preparation method thereof

The invention discloses a bulk heterojunction organic thin-film solar cell and a preparation method thereof. The cell has an inverted structure and is composed of a transparent substrate, a transparent cathode, a cathode modification layer, an active layer, a hole transmission layer and a metal anode which are arranged from the bottom to the top in turn. The modification effect of hindered amine light stabilizer material to the transparent electrode is utilized so that the work function of the transparent cathode is reduced, energy level of the transparent cathode is coordinated, cathode interface barrier is reduced and electron transmission and collection capability of the cathode is enhanced. Besides, the suppression effect of the hindered amine light stabilizer to photochemical reaction is utilized so that stability of the cathode interface is also enhanced by the modification layer and aging resistance of the cell can be enhanced. The modification layer is prepared by a spin coating and self-assembling method so that the preparation technology is simple. Besides, the light stabilizer is material of mass industrial production so that reduction of cost of the solar cell is facilitated.