Semiconducting polymers have broad device application potential, particularly when doped, either chemically or electrochemically, to improve conductivity. Carrier mobility in doped polymers is highly variable, however, and much of that variability stems from strong electrostatic attraction between dopants and their counter-ions. Here, we first explore how polymer and dopant structure can be used to mitigate that electrostatic attraction, considering the interplay between dopant size, polymer chain packing, polymer crystallinity, and doping mechanism. We next consider applications for doped conjugated polymers, focusing on their use as binders in lithium ion batteries. Battery binders are usually chosen only for chemical inertness, but adding electronic conductivity can improve battery cycling. If polymer doping energies are matched to the electrode material, highly conductive binders can be produced. By tuning the side chains, ionic conductivity can further be mixed with electronic conductivity, both of which are needed for fast battery operation.
Investigation into the interface formed between Sb2Te3/Ni80Fe20 heterostructures – this is studied using temperature dependent magnetometry, scanning transmission electron microscopy, ferromagnetic resonance, and theoretical support.
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