Ultrafast dynamics of carrier mobility in a conjugated polymer probed at molecular and microscopic length scales.
We used time-resolved electric-field-induced second-harmonic generation to probe the charge-carrier-mobility dynamics in amorphous organic materials on an ultrafast time scale. We were able to show that the mobility in poly-spiro-bifluorene-co-benzothiadiazol decreases from 0.1 cm 2/V s at 1 ps to 10-6 cm2/V s within 1 mus. We attribute this dramatic decrease to the relaxation of the charge carriers within the density of states, clearly demonstrating the impact of disorder on the nanoscale charge transport in amorphous semiconductors.
Devizis
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Institute of Physics, Savanoriu 231, Vilnius, Lithuania.
Serbenta
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Meerholz
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Hertel
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Gulbinas
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