Charge separation by photoexcitation in semicrystalline polymeric semiconductors: An intrinsic or extrinsic mechanism?

Abstract

We probe charge photogeneration and subsequent recombination dynamics in neat regioregular poly(3-hexylthiophene) films over six decades in time by means of time-resolved photoluminescence spectroscopy. Exciton dissociation at 10K occurs extrinsically at interfaces between molecularly ordered and disordered domains. Polaron pairs thus produced recombine by tunnelling with distributed rates governed by the distribution of electron-hole radii. Quantum-chemical calculations suggest that hot-exciton dissociation at such interfaces results from a high charge-transfer character.

10 pages, 3 figures

References in corpus (2)

• The role of intermolecular coupling in the photophysics of disordered organic semiconductors: Aggregate emission in regioregular polythiophene
• Carrier recombination dynamics in InGaN/GaN multiple quantum wells

Cited by in corpus (4)

• Incoherent population mixing contributions to phase-modulation two-dimensional coherent excitation spectra
• Chain Conformation and Exciton Delocalization in a Push-Pull Conjugated Polymer
• Resolving nonlinear recombination dynamics in semiconductors via ultrafast excitation correlation spectroscopy: Photoluminescence versus photocurrent detection
• Exciton Bimolecular Annihilation Dynamics in Push-Pull Semiconductor Polymers