Terahertz complex conductivities of carriers with partial localization in doped polythiophenes

Unuma, Takeya; Fujii, Kenji; Kishida, Hideo; Nakamura, Arao
July 2010
Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p033308
Academic Journal
We have investigated the complex conductivity spectra σ(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 σ(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 σ(ω) with the Drude–Smith model, we show that carriers become less localized with increasing carrier density up to ∼1.8×1020 cm-3.


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