Designing of quasi-one-dimensional compositional superlattices of donor–acceptor polymers

Abstract

The electronic structure and conduction properties of quasi-one-dimensional compositional superlattices (copolymers)(C_m D_n)_x belonging to the class of type II-staggered donor–acceptor polymers poly(cyanomethylene cyclopentadipyrrole)(PCNPy)(C)_x and poly(cyanomethylene cyclopentadithiophene)(PCNTh)(D)_x have been investigated using the negative-factor counting method in the tight binding approximation. It is found that increasing the proportion of either of the two components (C or D) in the copolymer chain improves the intrinsic conductivity of the chain. This is accompanied by the increased n-dopant-philicity in the case of low band-gap component PCNTh and increased p-dopant-philicity in the case of large band-gap component PCNPy.