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 1...

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Bibliographic Details
Published inPhysical review letters Vol. 103; no. 2; p. 027404
Main Authors Devizis, A, Serbenta, A, Meerholz, K, Hertel, D, Gulbinas, V
Format Journal Article
LanguageEnglish
Published United States 10.07.2009
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Summary: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.
ISSN:0031-9007
DOI:10.1103/physrevlett.103.027404