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Non-linear charge transport in polythiophene under high AC field

Published online by Cambridge University Press:  01 February 2011

Jan Obrzut ,
Tatiana Psurek ,
C. K. Chiang  and
Dean M. DeLongchamp
Jan Obrzut
Affiliation:
jan.obrzut@nist.gov, National Institute of Standards and Technology, 100 Bureau Dr, STOP 8541, Gaithersburg, MD, 20899, United States
Tatiana Psurek
Affiliation:
tatiana.psurek@nist.gov
C. K. Chiang
Affiliation:
CK.chiang@nist.gov
Dean M. DeLongchamp
Affiliation:
d.delongchamp@nist.gov
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Abstract

Complex impedance and conductivity were measured for regioregular poly(3-hexylthiophene) (P3HT) at alternating current (AC) voltages using a waveform technique. The waveforms were Fourier transformed from time domain to frequency domain and analyzed at fundamental and higher order harmonic frequencies. It was found that the impedance of the semi-conducting P3HT decreases with increasing electric field strength. The non-linear charge transport is dominated by a third harmonic response that originates from extended polarizability of π-type electronic states. The third order non-linear conductivity can be used to quantify the effect of an electric field on the conduction mechanism and to correlate the intrinsic charge carriers mobility with molecular structure.

Keywords

electrical propertiespolymerelectronic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 889: Symposium W – Electroresponsive Polymers and Their Applications , 2005 , 0889-W08-01
Copyright
Copyright © Materials Research Society 2006

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References

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