Understanding molecular structure dependence of exciton diffusion in conjugated small molecules

Understanding molecular structure dependence of exciton diffusion in conjugated small molecules

Temperature dependence of exciton diffusion in conjugated polymers.

The temperature dependence of the exciton dynamics in a conjugated polymer is studied using time-resolved spectroscopy. Photoluminescence decays were measured in heterostructured samples containing a sharp polymer-fullerene interface, which acts as an exciton quenching wall. Using a 1D diffusion model, the exciton diffusion length and diffusion coefficient were extracted in the temperature rang...

Excited-State Structure Modifications Due to Molecular Substituents and Exciton Scattering in Conjugated Molecules.

Attachment of chemical substituents (such as polar moieties) constitutes an efficient and convenient way to modify physical and chemical properties of conjugated polymers and oligomers. Associated modifications in the molecular electronic states can be comprehensively described by examining scattering of excitons in the polymer's backbone at the scattering center representing the chemical subst...

Modelling exciton diffusion in disordered conjugated polymers

We present a combined quantum-chemical and Monte Carlo approach for calculating exciton transport properties in disordered organic materials starting from the molecular scale. We show that traps and energetic disorder are the main limitations for exciton diffusion in conjugated polymers. An analytical model for exciton hopping in a medium of sites with uncorellated energetic disorder gives a qu...

Molecular-weight dependence of interchain polaron delocalization and exciton bandwidth in high-mobility conjugated polymers

Jui-Fen Chang,1 Jenny Clark,1 Ni Zhao,1 Henning Sirringhaus,1,* Dag W. Breiby,2 Jens W. Andreasen,2 Martin M. Nielsen,2 Mark Giles,3 Martin Heeney,3 and Iain McCulloch3 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom 2Danish Polymer Centre, Risø National Laboratory, 4000 Roskilde, Denmark 3Merck Chemicals, University Parkway, Chilworth Science P...