A novel planar D-A alternating copolymer with D-A integrated structures exhibiting H-aggregate behaviors for polymer solar cells

摘要: With the D-A integrated structure concept, a new donor–acceptor (D-A) copolymer poly{(N-dodecyl-carbazole[3,4-c:5,6-c]bis[1,2,5]thiadiazole-alt-4,8-di(2-ethylhexy-loxyl)benzo[1,2-b:4,5-b′]dithiophene)} has been designed and synthesized using novel architecture N-dodecyl-carbazole[3,4-c:5,6-c]bis[1,2,5]thiadiazole, di(2-ethylhexy-loxyl)benzo[1,2-b:4,5-b′]dithiophene) as basic building blocks. The low-lying highest occupied molecular orbital energy level of −5.41 eV broaden absorption matching well with main solar photon flux. Note that an H-aggregation beneficial for charge transportation collection is formed in macromolecules film, which implies planar favors strong intermolecular interaction to render molecules aggregated via face-to-face self-assembly. aggregation becomes larger scale after thermal annealing. Additionally, obvious intramolecular transfer have occurred created integration. Without any treatment, resulting polymer achieved efficiency 2.0% relatively high open-circuit voltage (Voc) value 0.77 V when blended [6,6]-phenyl-C61-butyric acid methyl ester typical bulk heterojunction. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Chem, 2013