NOVELTY - The organic solar cell comprises a first sub-cell including a first active layer (120), and a second sub-cell including a second active layer (140). The first active layer and/or the second active layer includes two types of electron acceptors having different light absorbance from each other. The first active layer includes a first electron donor absorbing light of a first wavelength region, and a first electron acceptor. The second active layer includes a second electron donor absorbing light of a second wavelength region longer than the first wavelength region.    USE - Used as an organic solar cell.    ADVANTAGE - The organic solar cell exhibits high performance and external quantum efficiency and improved light absorbing rate.    DETAILED DESCRIPTION - The organic solar cell comprises a first sub-cell including a first active layer (120), and a second sub-cell including a second active layer (140). The first active layer and/or the second active layer includes two types of electron acceptors having different light absorbance from each other. The first active layer includes a first electron donor absorbing light of a first wavelength region, and a first electron acceptor. The second active layer includes a second electron donor absorbing light of a second wavelength region longer than the first wavelength region, and a second electron acceptor and a third electron acceptor having different light absorbance from each other. The second electron acceptor and the third electron acceptor absorb light having equivalent wavelength regions to each other and light of different wavelength regions from the second electron donor, and are included in a weight ratio of 1:99-99:1. The second electron acceptor includes a compound having a light absorbing moiety of an optically symmetric structure. The third electron acceptor includes a compound having a light absorbing moiety of an optically asymmetric structure. The first electron donor includes a first compound having a bandgap of 1.6-2.2 eV, and the second electron donor includes a second compound having a bandgap of 0.6-2.0 eV. The first wavelength region is 200-780 nm, and the second wavelength region is 400-2000 nm. The organic solar cell further comprises a first electrode (110), an interconnection part (130) positioned on one side of the first active layer, and a second electrode (150) positioned on the second active layer. The first active layer is disposed on one side of the first electrode. The second active layer is disposed on one side of the interconnection part. The first electrode, the first active layer, and the interconnection part generate a first output current, and the second electrode, the second active layer, and the interconnection part generate equivalent second output currents to the first output current by controlling a composition ratio of the electron acceptors having different light absorbance from each other. The interconnection part comprises a multilayer including a conductive polymer, an insulating polymer, a ferroelectric polymer and metal oxide layer, and a conductive thin film disposed between the multilayers. The second output current is 0.9-1.1 times the first output current.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of an organic solar cell.    First electrode (110)    First active layer (120)    Interconnection part (130)    Second active layer (140)    Second electrode. (150)