On the electronic structures of quasi-one-dimensional model superlattices of type-I

Abstract

The electronic structures of the three different quasi-one-dimensional model superlattices (copolymers)(A_mB_n)_x belonging to the class of type- I have been calculated in the tight-binding approximation using the direct numerical approach. For each of the three systems, component A is the same while component B, though having same band widths and band gap, differs in its alignment with respect to A. The trends in their electronic structures as a function of (i) composition (m/n), (ii) block sizes m and n and (iii) arrangement of units (periodic or aperiodic) in the copolymer chain are discussed. The results obtained are important guidelines for designing copolymers with tailor-made conduction properties.