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Implantation-Induced Conductivity of Polymers

Published online by Cambridge University Press:  25 February 2011

B. Wasserman ,
G. Braunstein ,
M.S. Dresselhaus  and
G.E. Wnek
B. Wasserman
Affiliation:
Center for Materials Science and Engineering; Department of Physics;
G. Braunstein
Affiliation:
Center for Materials Science and Engineering; Department of Physics;
M.S. Dresselhaus
Affiliation:
Center for Materials Science and Engineering; Department of Physics; Department of Electrical Engineering and Computer Science;
G.E. Wnek
Affiliation:
Center for Materials Science and Engineering; Department of Materials Science and Engineering;Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

Ion implantation causes an increase by ~14 orders of magnitude in the electricalconductivity of normally insulating polymers such as polyacrylonitrile (PAN), poly(2,6 dimethyl phenylene-oxide) (PPO), and poly (pphenylene sulfide) (PPS), after ion implantation with Br at fluences of 3 × 1015 ions/cm2. The temperature dependence of the dc conductivity was measured in the range 23 〈 T 〈 293 K and results show an exponential law σ ~ exp(−To/T)a) for PAN, PPO and PPS with α =1/2, suggesting a one-dimensional hopping mechanism. The temperature dependence of the thermoelectric power (TEP) identifies the sign of the dominant carrier type. The TEP exhibits linear metallic behavior, with small magnitudes (~3μV/K), and shows Br implantation to yield p-type material in PPS and n-type material in PAN with extremely low values of mobility (〈 10−3 cm2/V sec) and correspondingly very high values of the carrier concentration estimated to be 5 × 1022 cm-3. Results are also reported for the frequency dependence of the AC conductivity and of similarly implanted PPS and PAN samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 27: Symposium E – Ion Implantation and Ion Beam Processing of Materials , 1983 , 423
Copyright
Copyright © Materials Research Society 1984

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References

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