Abstract
Abstract We study the dynamics of photoexcited carriers in pristine oxygen-free C 60 films using the measurement of the transient photoconductivity (PC). The nonexponential relaxation of photocarriers in oxygen-free C 60 can be described by the multiple trapping model. The carrier recombination kinetics is characteristic of bimolecular recombination at high temperature. As the thermally-activated long-lived PC component freezes out at the low temperature regime, a monomolecular recombination prevails and the carrier relaxation approaches an exponential decay. The peak transient PC exhibits a local maximum at T=240 K, near a first-order structural phase transition temperature, indicating that evaporated film of oxygen-free C 60 contains regions of structurally ordered C 60 . The disorder in a pristine C 60 film is manifested by the existence of a large, thermally-activated, long-lived PC component.
Published Version
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