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Non-Linear Charge Transport in Polythiophene Under High AC Field



Jan Obrzut, Tatiana Psurek, C. K. Chiang, Dean DeLongchamp


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 semiconducting 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 p-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.
Proceedings Title
Materials Research Society 2005 Fall Meeting
Conference Dates
November 27-December 1, 2005
Conference Location
Boston, MA, US
Conference Title
Materials Research Society Symposium Proceedings


AC waveforms, conductivity, harmonics, impedance, nonlinear charge transport, organic electronic, polytiophene


Obrzut, J. , Psurek, T. , Chiang, C. and DeLongchamp, D. (2005), Non-Linear Charge Transport in Polythiophene Under High AC Field, Materials Research Society 2005 Fall Meeting, Boston, MA, US, [online], (Accessed May 23, 2024)


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Created December 31, 2004, Updated October 12, 2021