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 (TaS), 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. By constructing a two-dimensional van der Waals stack heterostructure, TaS/organics/TiS, a significantly enhanced absolute Seebeck coefficient of 38.3 μV K was obtained, mostly attributed to the induced interfacial effect. The power factor reached 87.6 μW m K, 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.

中文翻译：

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用于柔性热电材料的二维范德华堆叠异质结构

将不同材料纳入异质结构已成为一种用于调制界面和电子配置的强大技术。二维 (2D) 材料的引入为以范德华堆栈的形式生成创新异质结构带来了无与伦比的前景。硫化钽 (TaS) 是一种重要的二维材料，已在各个领域进行了广泛的研究，但由于其绝对塞贝克系数降低至 10 μV K 以下，因此在热电转换方面面临限制。通过构建二维范德华堆叠异质结构，TaS/有机物/TiS 的绝对塞贝克系数显着增强为 38.3 μV K，这主要归因于诱导的界面效应。功率因数达到87.6 μW m K，比原来提高了7倍。该热电发电机在 40 K 温差下表现出 86.4 nW 的最大功率。在触觉和呼吸传感器中采用这种异质结构薄膜，在帮助视障人士提供语言辅助和促进实时监测呼吸频率以进行健康监测方面展现出令人鼓舞的前景目的。这项研究强调了二维范德华堆叠异质结构技术在柔性热电发电机、可穿戴传感器等领域的广阔潜力。