S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Dynamics of Photoexcited Carriers in Pristine Oxygen-Free C60 Films: Study of the Time-Resolved Transient Photoconductivity
- Lee, Changhee; Yu, G.; Moses, D.; Srdanov, V. I.
- Issue Date
- Synth. Met.70 (1995) 1413
- We study the dynamics of photoexcited carriers in pristine oxygen-free C60 films using the measurement of the transient photoconductivity (PC). The nonexponential relaxation of photocarriers in oxygen-free C60 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 C60 contains regions of structurally ordered C60. The disorder in a pristine C60 film is manifested by the existence of a large, thermally-activated, long-lived PC component.
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