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A prefabricated conductive polymer film of polymer poly(3,4-ethylenedioxy-thiophene):poly (styrene-sulfonate) (PEDOT:PSS) is developed and is used as the anode in an inverted polymer solar cell (PSC) through a lamination process.The geometry structure of the PSC is indium tin oxide/interface layer/P3HT:PCBM/PEDOT:PSS.The PEDOT:PSS electrode is 5 μm and the sheet resistance is 10 Ω/sq.The device fabrication process is vacuum-free and extremely simple.Lithium carbonate (Li2CO3) and cesium carbonate (Cs2CO3) are used as the cathode interface layers,respectively,and the result shows that Li2CO3 can enhance the open-circuit voltage (Voc) and fill factor distinctly,and the power conversion efficiency (PCE) can reach 2.1％.