Effect of doping with C60 on photocurrent and hole mobility in polymer composites measured by using the time-of-flight technique

The influence of the buckminsterfullerene C60 on photocurrent generation and hole transport properties in polymer films of poly(styrene) (PS) doped with N,N′-bis-(3-tolyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (TPD), has been determined and analyzed by using the time-of-flight technique (TOF). Measurements were realized on indium–tin oxide/polymer composites/indium–tin oxide samples. The dependence of the charge mobility as a function of the electric field and temperature was investigated and analyzed by using the Gaussian disorder model. An enhancement of photocurrent and hole mobility was observed with increasing the C60 concentration from 0 to 2 wt.%.