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- W2019885903 abstract "We have developed a new multifused indacenodithieno[3,2-b]thiophene arene (IDTT) unit where the central phenylene is covalently fastened with the two outer thieno[3,2-b]thiophene (TT) rings, forming two cyclopentadiene rings embedded in a heptacyclic structure. This rigid and coplanar IDTT building block was copolymerized with electron-deficient acceptors, 4,7-dibromo-2,1,3-benzothiadiazole (BT), 4,7-dibromo-5,6-difluoro-2,1,3-benzothiadiazole (FBT) and 1,3-dibromo-thieno[3,4-c]pyrrole-4,6-dione (TPD) via Stille polymerization, respectively. Because the higher content of the thienothiophene moieties in the fully coplanar IDTT structure facilitates π-electron delocalization, these new polymers show much improved light-harvesting abilities and enhanced charge mobilities compared to PDITTBT copolymer using hexacyclic diindenothieno[3,2-b]thiophene (DITT) as the donor moieties. The device using PIDTTBT:PC71BM (1:4, w/w) exhibited a decent power conversion efficiency (PCE) of 3.8%. Meanwhile, the solar cell using PIDTTFBT:PC71BM (1:4 in wt %) blend exhibited a greater Voc value of 0.9 V and a larger Jsc of 10.08 mA/cm2, improving the PCE to 4.2%. The enhanced Voc is attributed to the lower-lying of HOMO energy level of PIDTTFBT as a result of fluorine withdrawing effect on the BT unit. A highest PCE of 4.3% was achieved for the device incorporating PIDTTTPD:PC71BM (1:4 in wt %) blend." @default.
- W2019885903 created "2016-06-24" @default.
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- W2019885903 date "2012-11-27" @default.
- W2019885903 modified "2023-10-17" @default.
- W2019885903 title "Synthesis, Molecular and Photovoltaic Properties of Donor–Acceptor Conjugated Polymers Incorporating a New Heptacylic Indacenodithieno[3,2-<i>b</i>]thiophene Arene" @default.
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- W2019885903 doi "https://doi.org/10.1021/ma3019552" @default.
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