Disordered configuration leads to decoupled conductivity and thermopower

Advancements in thermoelectric performance are confronting chal-lenges because of the coupling of thermoelectric properties. There-fore, it is crucial to design feasible strategies to disrupt this intrinsic coupling while concurrently optimizing the transport of both charge carriers and phonons. This study illustrates the potential of morpho-logical disorder for thermoelectric decoupling by a graphene film (GF) with controllable morphology. A successful decoupling triggered by rising temperature leading to an increase in both the Seebeck coefficient (S) and the electrical conductivity (o-) has been achieved in crystalline GF by creating a disordered micromor-phology (a-GF). Fundamentally, morphological disorder supports a temperature-controllable density of states (DOS) at the Fermi level (Ef) by adjusting the weak localization (WL) and the electron -electron interaction (EEI). Simultaneously, a temperature -indepen-dent thermal conductivity (k) was obtained in a-GF, attributed to defect phonon scattering rather than electron-phonon interaction. This research provides evidence for the beneficial impact of disor-dered morphology on thermoelectric decoupling and proposes a promising direction for the optimization of polycrystalline thermo-electric materials.