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Photoconductivity of Highly Disordered Carbon Fibers

Published online by Cambridge University Press:  26 February 2011

Kazuyoshii Kuriyama  and
Mildred.S. Dresselhauss
Kazuyoshii Kuriyama
Affiliation:
Sumitomo Metal Industries Ltd., Sunayama16, Hlasaki, Kashima, Ibaraki, Japan
Mildred.S. Dresselhauss
Affiliation:
Massachusetts Institute of Technology, Electrical Engineering and Physics,77 Massachusetts Avenue, Cambridge, NA 02139
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Abstract

A highly disordered carbon material, activated carbon fibers, is investigated through bulk conductivity and photoconductivity measurements. This material has a high density of defect states introduced by an aqtivation process that leads to a huge specific surface area of up to 2000m2/g. The conductivity increases by a factor of 4–10 with increasing temperaturefrom 30K to 290K. In contrast, the photoconductivity decreases by a factor of three with increasing temperature. The relaxation time of the photoconductivity is rather long(on the order 10−1 sec), indicating that the recombination process proceeds through localized states. flopping processes are used to interpret the transport properties of this material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 341
Copyright
Copyright © Materials Research Society 1991

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References

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