In the context of organic solar cells, electron-hole dissociation is sometimes mentioned with regard to excitons (refs 1, 2) and sometime with regard to geminate pairs (refs 3, 4).
Also, exciton binding energy is 10meV (Wannier) - 1eV (Frenkel), while geminate pair binding energy is generally up to 0.5eV.
So what's the difference between an exciton and a geminate pair?