Formation of Fullerides and Fullerene-Based Heterostructures

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Science  09 Aug 1991:
Vol. 253, Issue 5020, pp. 646-648
DOI: 10.1126/science.253.5020.646


Two potassium fulleride phases, metallic K3C60 and nonmetallic K6C60, are formed when potassium is incorporated into thin C60 films under ultrahigh vacuum conditions. Phase separation is observed for intermediate stoichiometries. Results obtained for the C60-K3C60 heterostructure demonstrate that it is stable against potassium migration from the K3C60 phase. In contrast, the C60-K6C60 interface is not stable and K3C60 is formed.

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