Modelling Exciton Diffusion in Organic Semiconductors

The above image is a 3D representation of the exciton population (n) in a polymer film in contact with a quencher at z = 0 as a function of time. This model is used to calculate the diffusion coefficient of organic semiconductors by fitting to experimental data of organic thin films on quenching substrates. The total exciton population in such films as a function of time is obtained by time-resolved measurements of the fluorescence. Exciton diffusion is an important process in the operation of organic semiconductor devices, particularly solar cells, and you can read more about it here. A more detailed description of the model and its associated experiment can be found in this recent publication.