Single-component organic solar cells (SCOSCs) with high stability and simplified fabrication process are supposed to accelerate the commercialization of organic photovoltaics.However,the types of photo-active materials and photovoltaic performance of SCOSCs are still far lagging behind the bulk-heterojunction type organic solar cells (BHJ OSCs).It is still an arduous task to introduce new photo-active materials into SCOSCs,aiming to improve the efficiencies of SCOSCs.One feasible way is to construct double-cable polymers with new structures and tune conformation,morphology and mobility for the improvement in power conversion efficiencies (PCEs).Hence,in this work,we constructed a new double-cable polymer PBTT-BPTI by introducing fused core 5,7-dibromo-2,3-bis(2-ethylhexyl)benzo[1,2-b:4,5-c\']dithiophene-4,8-dione (TTDO) into the main backbone and benzo[ghi]-perylene triimide (BPTI) unit into the side chain.Both of the two units show strong electron-withdrawing property,which are expected to broaden absorp-tion spectra and enhance intermolecular interaction.The double-cable polymer exhibited a broad absorp-tion in the range of 300-700 nm with an optical band gap (Eg) of 1.79 eV.The PCE of PBTT-BPTI-based SCOSCs was 2.15％,which may be limited by the unconstructed efficient electron transporting channels.