Embedding of magnetic functional units into the thermoelectric (TE) materials has been demonstrated to be an effective way to enhance the TE conversion performance. However, the magnetic functional units in TE materials are all randomly distributed. In this paper, to explore the effect of the ordering of the magnetic functional units on TE conversion performance, a series of BiSbTe/epoxy flexible thermoelectromagnetic (TEM) films with dot magnetic arrays were successfully prepared by a twostep screen printing combined with a hot pressing process. TEM films with dot magnetic arrays can achieve high carrier mobility, while the carrier concentration increases due to large coercivity. Therefore, its electrical conductivities are significantly improved on the condition that it maintains a high Seebeck coefficient. The TEM film with hexagonal-dot magnetic arrays exhibits the best electrical transport properties, for which the room-temperature power factor reaches 1.51 mW•m −1 •K −2 , increased by 33.6 and 36.1% as compared with those of the pristine TE film and the TEM film with a continuous magnetic layer, respectively. This work provides a new way to enhance the TE conversion performance of flexible TEM films through the ordered magnetic arrays.
A built‐in magnetic field by magnetic embedding has been proven to be an effective approach to improve the electro‐thermal conversion performance of thermoelectric materials. However, the function of the built‐in magnetic field direction is still unknown. In this study, ferromagnetic Co particles with different morphologies are introduced into Bi0.5Sb1.5Te3/PVDF thermoelectric films to control the direction of the built‐in magnetic field. Co particles with shape anisotropy establish magnetic anisotropy fields inside the flexible thermoelectromagnetic films, which make the magnetic moments tend to be aligned parallel to the film surface, causing spiral motion of carriers. The atomic‐scale micro‐electric field established by the in situ reaction of Co and Te induces hopping migration of carriers. The coupling of the magnetic anisotropy field and micro‐electric field brings about a substantial increase in carrier mobility, thus greatly enhancing conductivity. The carrier energy filtering effect generated by Bi0.5Sb1.5Te3/CoTe2/Co hetero interface and additional magnetic scattering provided by the CoTe2/Co micro‐magnetic field maintain the Seebeck coefficient at a high level. The maximum power factor of Co/Bi0.5Sb1.5Te3/PVDF flexible thermoelectromagnetic film with sheet Co particles reaches 1.45 mW m−1 K−2 at 300 K, increased by 54% and 6% as compared with that of Bi0.5Sb1.5Te3/PVDF thermoelectric film and Co/Bi0.5Sb1.5Te3/PVDF flexible thermoelectromagnetic film with spherical Co particles, respectively.
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