Abstract
Band structures of C 60-polymers are studied changing conjugation conditions and the electron number. We use a Su-Schrieffer-Heeger type semiempirical model. In the neutral C 60-polymer, electronic structures change among direct-gap insulator and the metal, depending on the degree of conjugations. The C 60-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 C 60-polymer doped with two electrons per one C 60 changes from an indirect-gap insulator to the direct-gap insulator, as the conjugations become stronger.
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