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Applied Physics Letters / Volume 97 / Issue 3 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 97, 033308 (2010); http://dx.doi.org/10.1063/1.3466916 (3 pages)

Terahertz complex conductivities of carriers with partial localization in doped polythiophenes

Takeya Unuma, Kenji Fujii, Hideo Kishida, and Arao Nakamura

Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

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(Received 27 April 2010; accepted 27 June 2010; published online 21 July 2010)

We have investigated the complex conductivity spectra math(ω) of two p-doped polythiophenes—poly(3-hexylthiophene) and poly(3,4-ethylenedioxythiophene)—with various carrier densities by using terahertz time-domain spectroscopy. The real part of math(ω) is found to gradually decrease with decreasing frequency ω and to approach a finite value for ω→0 unlike the Drude conductivity behavior, suggesting that carriers in polythiophenes have a partially localized nature. By reproducing both the measured real and imaginary parts of math(ω) with the Drude–Smith model, we show that carriers become less localized with increasing carrier density up to ∼ 1.8×1020 cm−3.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

carrier density, carrier relaxation time, conducting polymers, electrical conductivity, terahertz wave spectra

PACS

  • 78.70.Gq

    Microwave and radio-frequency interactions

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3466916

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Temporal waveforms of THz electric fields transmitted through a free-standing film of regioregular P3HT doped with ClO4− for various doping times. The time origin (t = 0) is set to an arbitrary position.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Absorption coefficient spectra of fully doped regioregular P3HT measured by THz time-domain spectroscopy for 0.92–10.43 meV and by conventional FTIR spectroscopy for 7.7–991.8 meV.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Complex conductivity spectra math(ω) of regioregular P3HT (circles) prepared with doping times of 30, 120, and 360 s. Also shown by curved lines are Drude–Smith conductivity fits to math(ω).

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Dependence of (a) localization parameter C and (b) momentum relaxation time τ on carrier density N for regioregular P3HT (filled circles), regiorandom P3HT (open circle), and PEDOT (open triangles).

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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