Impact of Mixed Phases and Domain Network Tortuosity on Long-Range Charge Transport in Phase-Separated Organic Semiconductor Blends*

Quantitative structure-property models for how the molecular-scale and meso-scale structure in polymer blends affect long-range charge transport behavior is needed to refine design rules for a wide variety of organic electronic device applications, such as photovoltaics, field-effect transistors, thermoelectrics, and bioelectronics. In this presentation, we will demonstrate the use of kinetic Monte Carlo simulations with morphologies derived from electron tomography measurements and a simple Ising-based model to probe how the multi-length-scale structure due to disordered interfacial mixed phases and mesoscale domain network tortuosity impact long-range charge transport phenomena. We will specifically quantify how these features impact the electric field and temperature dependence of the charge carrier mobility.