Hole transport in polyvinylcarbazole: The vital importance of excitation-light intensity

Transient photoconductivity measurements of holes in polyvinylcarbazole are reported. It is found that good agreement, with the dispersive transport theory of Scher and Montroll is obtained only for light intensities two orders of magnitude below values conventionally used. In contrast to earlier results we find a single temperature-independent value of equal to 0.66(0.05). © 1987 The American Physical Society.