Interaction of Self-Localized Excitations with C60 Weak Dopants in Conducting Polymers

Abstract

Abstract Weak dopants, like C60, (which have LUMO level within the band gap of conducting polymer (CP)) may provide various types of interactions with self-localized (SL) excitations of CP chain: solitons (S˚, S), polaron/bipolarons (P/BP) or excitonpolarons (Ex), whose electronic levels are also located deeply inside the gap. In the present paper we analyse some types of interactions: 1) “Chemical reaction” type charge transfer (CT) processes between charged (P/BP, S) and neutral (S˚, Ex) excitations with C60 molecules intercallated between chains of CP. We stress the important role of SL states of C60 molecule itself: string type polarons (Pc) and bipolarons BP2- c in ttie stabilisation of this reactions through reorientations of string P− c/BP2- c relatively to CP chains resulting ui suppression of backward CT recombination. 2) The C60 mediated interchain hoping of electrons is considered withitin Holstein-Rashba molecular chain polaron approximation, which allows to find exact analytical solutions for...