An Alternating Copolymer Derived from Indolo[3,2-b ]carbazole and 4,7-Di(thieno[3,2-b ]thien-2-yl)-2,1,3-benzothiadiazole for Photovoltaic Cells
作者： Yangjun Xia , Xuehua Su , Zhicai He , Xia Ren , Hongbing Wu
关键词: Carbazole 、 Electron donor 、 Organic solar cell 、 Conjugated system 、 Crystallography 、 Thermal stability 、 Copolymer 、 Polymer solar cell 、 HOMO/LUMO 、 Polymer chemistry 、 Chemistry 、 Organic chemistry 、 Materials Chemistry 、 Polymers and Plastics
摘要: An alternating narrow bandgap conjugated copolymer (PICZ-DTBT, E(g) = 1.83 eV) derived from 5,11-di(9-heptadecanyl)indolo[3,2-b]carbazole and 4,7-di(thieno[3,2-b]thien-2-yl)-2,1,3-benzothiadiazole (DTBT), was prepared by the palladium-catalyzed Suzuki coupling reaction. The resultant polymer absorbs light 350-690 nm, exhibits two absorbance peaks at around 420 570 nm has good solution processibility thermal stability. highest occupied molecular orbital (HOMO) energy level lowest unoccupied (LUMO) of determined cyclic voltammetry were about -5.18 -3.35 eV, respectively. Prototype bulk heterojunction photovoltaic cells solid-state composite films based on PICZ-DTBT [6,6]-phenyl-C(71) butyric acid methyl ester (PC(71) BM), show power conversion efficiencies up to 2.4% under 80 mW · cm(-2) illumination (AM1.5) with an open-circuit voltage V(oc) = 0.75 V, a short current density J(sc) = 6.02 mA · cm(-2) , fill factor 42%. This indicates that is viable electron donor material for polymeric solar cells.
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