Charge transfer in intercalated C60 peapods

Abstract

We report on the charge transfer in intercalated C60 peapods as a function of doping. A competition between a charge transfer to the SWCNT pods and one to the C60 peas is observed. At low intercalation levels the charge transfer is predominantly to the SWCNT pods. This leads to a shift of the Fermi level beyond the third van Hove singularity of the semiconducting tubes for potassium intercalation (n‐doping) and beyond the first singularity of the metallic tubes for FeCl3 intercalation (p‐doping), respectively. In addition at high levels of potassium intercalation the C60 pods are charged up to C606− and form a metallic one dimensional polymer.