title: 2,1,3-Benzothiadiazole-5,6-dicarboxylic imide--a versatile building block for additive- and annealing-free processing of organic solar cells with efficiencies exceeding 8%.
abstract: A new photoactive polymer comprising benzo[1,2-b:3,4-b':5,6-d']trithiophene and 2,1,3-benzothiadiazole-5,6-dicarboxylic imide is reported. The synthetic design allows for alkyl chains to be introduced on both electron-rich and electron-deficient components, which in turn allows for rapid optimization of the alkyl chain substitution pattern. Consequently, the optimized polymer shows a maximum efficiency of 8.3% in organic photovoltaic devices processed in a commercially viable fashion without solvent additives, annealing, or device engineering.
authors.affiliation: Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, UK.
authors.forename: Christian B
authors.initials: CB
authors.lastname: Nielsen
authors.forename: Raja Shahid
authors.initials: RS
authors.lastname: Ashraf
authors.forename: Neil D
authors.initials: ND
authors.lastname: Treat
authors.forename: Bob C
authors.initials: BC
authors.lastname: Schroeder
authors.forename: Jenny E
authors.initials: JE
authors.lastname: Donaghey
authors.forename: Andrew J P
authors.initials: AJ
authors.lastname: White
authors.forename: Natalie
authors.initials: N
authors.lastname: Stingelin
authors.forename: Iain
authors.initials: I
authors.lastname: McCulloch
keywords: donor-acceptor polymers; organic electronics; organic photovoltaics