Exciton binding energy in poly(phenylene vinylene)

Abstract

The exciton binding energy ( E b) and the band gap energy ( E g) of poly(phenylene vinylene) (PPV) have been determined by photoconductivity excitation profile spectroscopy as a function of light polarization, applied electric field, and temperature. The exciton binding energy, E b≈60 meV, is obtained from the energy of the exciton peak relative to the band edge, and independently from analysis of the dependence of the exciton dissociation on field and temperature.