Bridgehead imine-substituted cyclopentadithiophene copolymers

摘要

One of the enduring challenges in the development of donor polymers for solar cells has been the manipulation of the donor polymer structure in order to optimise solution processability, charge carrier mobility, absorption profiles and characteristics. This study examined a series of donor-acceptor copolymers incorporating an aryl imine substituent at the bridgehead position of 4H-cyclopenta[2,l-b:3,4-b']dithiophene (CPDT). By varying the substituent(s) on the imine's aromatic ring, subde changes to the aromatic stabilisation could be effected, resulting in modulation of the HOMO-LUMO energy levels.