Publication date: 15th December 2025
Spatial inhomogeneity, in the form of more (crystalline) and less (amorphous) ordered regions, is a well-established phenomenon in state-of-the-art doped organic semiconductors (OSC). At the same time, a quantitative understanding of how exactly this inhomogeneity translates into (a reduction or enhancement of) the electrical conductivity remains largely elusive. In this talk, I will address two steps towards such a formal understanding. First, I will show how the electric field dependence of the conductivity of doped OSC can be used to extract an ‘effective’ localization length for the charge carriers as a characteristic length scale of charge transport that is complementary to conventional structural characterization. Tight-binding and kinetic Monte Carlo simulations are used to connect measured values to morphological properties, in particular to the width of and the distance between energy barriers in the percolating pathway. In the second part, it will be shown experimentally how a judicious blending of different polymers can be used to remove energy barriers that (still) limit the conductivity of high-performance pure materials, giving rise to materials with conductivities up to 60 000 S/cm and thermoelectric power factor above 2000 µW/mK2. Combining experiments and simulations, the conditions under which this effect occurs are identified.
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