Suppressing Structural Disorder of Highly Doped Conjugated Polymers by Photoactivated Doping for Organic Thermoelectrics
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Among molecular doping methods for controlling charge carriers in organic thermoelectrics (TEs), solution mixing is favored for producing uniform and thick TE films with high TE output. However, conventional molecular dopants generate a large amount of charged species within the polymer–dopant solution, deteriorating the microstructure and charge transport properties of conjugated polymers (CPs). Here, we introduce a novel doping method using photoacid generators (PAGs), which could maintain the high solid-state ordering of CPs by preventing the charge transfer reaction by dopants in the solution state. The PAG-mixed CP film preserves its crystallinity while effectively generating carriers after UV light irradiation, enabling the as-prepared film to have enhanced carrier delocalization and charge transport properties even through the solution mixing method. This work provides a doping strategy to optimize TE performance by addressing key challenges in conventional doping approaches.