YANTAI UNIV,DEPT PHYS,YANTAI 264005,PEOPLES R CHINA
; BEIJING UNIV,DEPT PHYS,BEIJING 100871,PEOPLES R CHINA
The Sn-doped C60 film was obtained by annealing a 100angstrom thick C60 film with 6angstrom thick Sn overlayer at 200-degrees-C. Photoelectron spectra show that the ratio of Sn atoms to C60 molecules in the film is about 3:1. The valence band and C Is core level spectra of the Sn-doped C60 film are similar to that of C60 film. In contrast with the expectation of the reported superconductive phase of Sn-doped C60, no metallic condution band with a distinct Fermi level cutoff has been observed in the valence bands portion.