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This study focuses on the fabrication of nanocomposite thermoelectric devices by blending either a naphthalene‐diimide (NDI)‐based conjugated polymer (NDI‐T1 or NDI‐T2), or an isoindigo (IID)‐based conjugated polymer (IID‐T2), with single‐walled carbon nanotubes (SWCNTs). This is followed by sequential process doping method with the small molecule 4‐(2,3‐dihydro‐1,3‐dimethyl‐1H‐benzimidazol‐2‐yl)‐N,N‐dimethylbenzenamine (N‐DMBI) to provide the nanocomposite with n‐type thermoelectric properties. Experiments in which the concentrations of the N‐DMBI dopant are varied demonstrate the successful conversion of all three polymer/SWCNT nanocomposites from p‐type to n‐type behavior. Comprehensive spectroscopic, microstructural, and morphological analyses of the pristine polymers and the various N‐DMBI‐doped polymer/SWCNT nanocomposites are performed in order to gain insights …