Abstract
Transport properties of regiorandom poly(3-hexyl thiophene) (RRaPHT) were investigated using integral mode time-of-flight (TOF), and novel extraction photo current transient (photo- CELIV) methods. Time dependence of the charge carrier mobility was observed. We measured a mobility μ ∼ 10 -5 - 10 -6 cm 2 /Vs in long time scales, with the photogenerated carrier lifetime τ = 1.5ms. From the inital tranport distauce we measured the fast mobility-lifeting product μ f τ f = 2 × 10 -11 cm 2 /V, from which we estimated μ f ∼ 0.2cm 2 /Vs by using the previously reported lifetime of the fast transport as τ f ≃ 100ps [G, Yu, et al., Phys. Rev. B42. 3004(1990)]. The time dependence of the charge carrier mobility is obtained over several orders of magnitude.
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