Temperature dependence of exciton and charge carrier dynamics in organic thin films

of ADT-TES-F emissive exciton dissociation to transient photocurrent was observed. In all materials, charge carriers were photogenerated at sub-500-ps time scales, limited by the laser pulse width, with temperature- and electric-field-independent photogeneration efficiency. In ADT-TES-F/C60 (2%) composites, the photogeneration efficiency was a factor of 2‐3 higher than that in pristine ADT-TES-F films. In ADT-TES-F/ADT-TIPS-CN (2%) blends, an additional charge carrier photogeneration component was observed at room temperature at time scales of ∼20 ns due to exciplex dissociation. At ∼0.5‐5 ns after photoexcitation, the carriers propagated via thermally and electric-field-activated hopping with an activation energy of ∼0.025 eV. At time scales longer than ∼ 5n s, charge transport of carriers that are not frozen in traps proceeded through tunneling via isoenergetic sites.