Doping Effects and Electronic States in C60-Polymers

Details Doping Effects and Electronic States in C60-Polymers Doping Effects and Electronic States in C60-Polymers

1995-03-23

arxiv.org/abs/cond-mat/9503125v2

Chem. Phys. Lett. 253 (1996) 420-427

Physics

Condensed Matter

to be published in Chem. Phys. Lett

Scientific paper

10.1016/0009-2614(96)00292-8

Band structures of C60-polymers are studied changing conjugation conditions and the electron number. We use a Su-Schrieffer-Heeger type semiempirical model. In the neutral C60-polymer, electronic structures change among direct-gap insulator and the metal, depending on the degree of conjugations. The C60-polymer doped with one electron per one molecule is always a metal. The energy difference between the highest-occupied state and the lowest-unoccupied state of the neutral system becomes smaller upon doping owing to the polaron effects. The C60-polymer doped with two electrons per one C60 changes from an indirect-gap insulator to the direct-gap insulator, as the conjugations become stronger.

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