Electronic Processes at Semiconductor Polymer Heterojunctions

This chapter contains sections titled: Introduction Molecular Complexes and Exciplexes Review of Molecular Exciplexes in Solution Exciplexes at the Polymer Heterojunction The Polymers used in this Chapter Type-II Heterojunctions The PFB:F8BT Exciplex The TFB:F8BT Exciplex The F8:PFB Exciplex No F8:TFB Exciplex? Comparison with Model: a Reason that there is no Exciplex inF8:TFB Charge Capture at Polymer Heterojunctions Barrier-free Electron Hole Capture in Polymer Blend LEDs Endothermic Exciplex-to-Exciton Energy Transfer at the F8:PFB Heterojunction Barrier-free Capture in Polymer Bilayer LEDs at Low Temperatures The High-voltage Limit of the Barrier-free Capture Regime Exciton Dissociation at Polymer Heterojunctions Exciton Dissociation and Exciton Regeneration Morphology-dependent Exciton Retrapping at Polymer Heterojunctions Predicted Similarity of EL and Delayed PL Spectra Summary Exciplex Formation is General in Polyfluorenes Electron Hole Capture can Occur Barrier-free via an Exciplex Intermediate Dissociated Excitons can be Regenerated via Geminate-Pair and Exciplex Intermediates High Interface Densities Lower the Barrier-free Capture and Exciton-Regeneration Efficiencies Conclusion