Abstract
Doping of polyacetylene, (CH)x, gives qualitative changes in electrical and optical properties at dopant concentrations above a few percent. It now makes materials as conducting as copper. The mechanism of this change has not been so clear. Disorder effects by the doping are analyzed, using the coherent potential approximation. Two types of impurities are taken into account. One is bond-type. They give rise to backward scatterings of electrons. The other is site-type with forward scatterings. The order parameter, electronic band structure, and density of states are obtained as functions of impurity concentration and strengths of impurity potentials. Due to the one-dimensional nature, the formation of impurity band in the gap is suppressed, if strength of the bond impurity is larger than that of the site impurity. When the site impurity is strong enough, a gapless structure takes place at high impurity concentrations. Phase diagrams are extensively given for various impurity strengths.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
