Stable Room Temperature Thermoelectric Properties in a Supramolecular Assembly of an n‐Type Naphthalene‐diimide‐based Amphiphile

Abstract Organic thermoelectric materials (OTEs) are in huge demand for their flexibility and robustness in applications of internet‐of‐things, wearables, and health monitoring devices. While choices of p‐type OTEs are widespread, there is still lack of stable (in air) n‐type systems to pair. Naphthalene‐diimides (NDIs), due to the presence of the planar‐structured electron‐deficient aromatic ring offer promising electron‐deficient building blocks to construct air‐stable n‐type semiconducting devices. Herein, an amphiphile derivative (cNDI‐1) is reported for two‐dimensional supramolecular assembly, and consequently TE measurements are carried out in a fully calibrated and standardised custom‐built Seebeck (S) set‐up. Promising S values (ca. −237 μV/K in THF and ca. −195 μV/K in water) are measured with a TE power factor of ∼0.05×10⁻⁵ μW/mK² in THF and ∼0.6×10⁻⁵ μW/mK² in water at room temperature. The study opens up the possibility of exploring broad range of molecular design library for newer n‐type OTEs.