The invention belongs to the technical field of optoelectronic devices and particularly relates to an organic/polymer solar cell with a single-component high-dielectric-constant photoactive layer andapplication thereof. The organic/polymer solar cell comprises a layer 1 and a layer 5 which are electrode layers which are a cathode and an anode specifically, a layer 2 and a layer 4 are charge transport layers which are a cathode electron transport layer and an anode hole transport layer specifically, a layer 3 is a single-component high-dielectric-constant organic/polymer photoactive layer which is an organic/polymer semiconductor material with a relative dielectric constant larger than 5, and an external circuit is used for a battery device.