Hsiow, C.-Y.C.-Y.HsiowWang, H.-Y.H.-Y.WangLin, Y.-H.Y.-H.LinRaja, R.R.RajaRwei, S.-P.S.-P.RweiChiu, W.-Y.W.-Y.ChiuDai, C.-A.C.-A.DaiCHI-AN DAIWang, L.L.Wang2020-01-062020-01-062016https://scholars.lib.ntu.edu.tw/handle/123456789/444687A series of novel p-type conjugated copolymers, PTTVBDT, PTTVBDT-TPD, and PTTVBDT-DPP, cooperating benzo[1,2-b:4,5-b']dithiophene (BDT) and terthiophene-vinylene (TTV) units with/without thieno[3,4-c]pyrrole-4,6-dione (TPD) or pyrrolo[3,4-c]pyrrole-1,4-dione (DPP) via Stille polymerization were synthesized and characterized. Copolymer PTTVBDT shows a low-lying HOMO energy level and ordered molecular-packing behavior. Furthermore, two terpolymers, PTTVBDT-TPD and PTTVBDT-DPP, display stronger absorption ability, alower-lying HOMO energy level, and preferred molecular orientation, due to the replacement TTV-monomer units with electron-deficient groups. Furthermore, bulk-heterojunction organic solar cells were fabricated using blends of the PTTVBDT-TPD, and PC61BM gave the best power conversion efficiency of 5.01% under the illumination of AM1.5G, 100mW·cm-2; the short circuit current (Jsc) was 11.65 mA·cm-2 which displayed a 43.8% improvement in comparison with the PTTVBDT/PC61BM device. These results demonstrate a valid strategy combining the two-dimensional molecular structure with random copolymerization strikes promising conjugated polymers to achieve highly efficient organic photovoltaics. © 2016 by the authors.[SDGs]SDG7Aromatic compounds; Heterojunctions; Molecular orientation; Organic solar cells; Polymer solar cells; Solar cells; Benzo[1,2-b:4,5-b']dithiophene; Bulk heterojunction organic solar cells; Power conversion efficiencies; Pyrrolo[3,4-c]pyrrole-1,4-dione; Random copolymerization; Side-chains; Synthesis and characterizations; Thieno[3,4-c]pyrrole-4,6-dione; Conjugated polymersjournal article10.3390/polym81103822-s2.0-84999737865https://www.scopus.com/inward/record.uri?eid=2-s2.0-84999737865&doi=10.3390%2fpolym8110382&partnerID=40&md5=00a5057cb62cc4041384e5f77f4643af