The development of organic solar cells is encouraged by the fact that building cells with a tandem structure shows significant promise in increasing light usage and reaching high efficiency. In this work, we use electron beam evaporated TiOx and PEDOT:PSS to create a cutting-edge linking layer for tandem organic solar cells. A dense, crisp, and smooth TiOx/PEDOT:PSS contact can be achieved using electron beam evaporation. The charge recombination between two subcells is ensured in PBDB-TF:GS-ISO/TiO1.76 and TiO1.76/PEDOT:PSS through careful regulation of the O2 flux during evaporation. National Institute of Metrology, China certifies an efficiency of 20.0 % for a tandem cell with a TiO1.76/PEDOT:PSS interconnecting layer. This cell achieves an efficiency of 20.27 %. Our findings therefore herald the beginning of the 20 % era in organic solar cells.

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