Devizis A, Serbenta A, Meerholz K, Hertel D, Gulbinas V
Institute of Physics, Savanoriu 231, Vilnius, Lithuania.
Phys Rev Lett. 2009 Jul 10;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 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.
