Multiscale Structural Control via Solvent-Additive Selectivity for Enhanced Charge Transport and Thermoelectric Performance in Doped Conjugated Polymers
발표자
김병진 (포항공과대학교)
연구책임자
조길원 (포항공과대학교)
공동저자
김병진 (포항공과대학교), 조길원 (포항공과대학교)
초록
내용
Controlling solvent–polymer interactions can boost thermoelectric performance in doped conjugated polymers, but how additives differentiate backbone vs side-chain interactions from solution to films remains unclear. Using a DPP–DTT polymer with oligoethylene glycol side chains, we compare backbone-selective, side-chain-selective, and marginal solvents and show that selectivity dictates microstructure. Backbone-affinitive solvents suppress π–π aggregation, disrupting percolation pathways and yielding randomly distributed dopants. In contrast, side-chain-affinitive solvents preferentially interact with TEG, driving dopants into polar side-chain regions, improving doping efficiency, and tuning nano-to-mesoscale structure for efficient transport. Mobility and doping efficiency increase together, delivering σ>1500 S cm⁻¹ and PF> 400μW m⁻¹ K⁻². Overall, we provide a solvent-selectivity processing guideline for organic thermoelectrics.