Ultrafast Dynamics of Carrier Mobility in a Conjugated Polymer Probed at Molecular and Microscopic Length Scales

作者：Devizis A^*; Serbenta A; Meerholz K; Hertel D; Gulbinas V

来源：Physical Review Letters, 2009, 103(2): 027404.

DOI：10.1103/PhysRevLett.103.027404

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) cm(2)/V s within 1 mu s. 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.

• 出版日期2009-7-10