Abstract
The incorporation of disparate materials into heterostructures has arisen as a formidable technique for modulating interfaces and electronic configurations. The introduction of two-dimensional (2D) materials has unveiled unparalleled prospects for generating innovative heterostructures in the guise of van der Waals stacks. Tantalum sulfide (TaS2), a prominent 2D material, has been extensively studied across various domains, faces constraints in thermoelectric conversion attributed to its diminished absolute Seebeck coefficient below 10 μV K−1. By constructing a two-dimensional van der Waals stack heterostructure, TaS2/organics/TiS2, a significantly enhanced absolute Seebeck coefficient of 38.3 μV K−1 was obtained, mostly attributed to the induced interfacial effect. The power factor reached 87.6 μW m−1 K−2, marking a sevenfold increase compared to the original. The thermoelectric generator demonstrated a maximum power of 86.4 nW at a temperature difference of 40 K. Employing such heterostructure films in tactile and respiration sensors demonstrated encouraging prospects for aiding the visually impaired with language assistance and facilitating real-time monitoring of respiratory rates for health monitoring purposes. This study highlights the expansive potential of two-dimensional van der Waals stack heterostructure technology for use in flexible thermoelectric generators, wearable sensors, and beyond.
Published Version
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