Solution-printable and flexible thermoelectric materials have attracted great attention because of their scalable processability and great potential for powering flexible electronics, but it is challenging to integrate mechanical flexibility, solution-printability and outstanding thermoelectric properties together. In particular, such an n-type thermoelectric material is highly sought after. In this paper, 2D TiS₂ nanosheets were exfoliated from layered polycrystalline powders, and then assembled with C₆₀ nanoparticles, resulting in a new class of flexible n-type thermoelectric materials via a concurrent enhancement in the power factor and a reduction in thermal conductivity. The resultant C₆₀/TiS₂ hybrid films show a ZT ∼ 0.3 at 400 K, far superior to the state-of-the-art solution-printable and flexible n-type thermoelectric materials. In particular, such a thermoelectric property rivals that of single-crystal TiS₂-based thermoelectric materials, which are expensive, difficult to synthesize, and unsuitable for solution printing. A solution of the C₆₀/TiS₂ hybrid was also used as an ink for printing large-area flexible and spatial thermoelectric devices. An outstanding output power of 1.68 W m⁻² was generated at a temperature gradient of 20 K. This work paves the way for flexible, solution-printable, high-performance thermoelectric materials for flexible electronics.

中文翻译：

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可打印的富勒烯/ TiS ₂有机/无机杂化物，用于高性能柔性n型热电器件†

可溶液印刷和柔性热电材料因其可扩展的加工性能和为柔性电子设备提供动力的潜力而备受关注，但将机械柔韧性，溶液可印刷性和出色的热电性能整合在一起是一项挑战。特别地，这种n型热电材料是高度追求的。在本文中，将二维TiS ₂纳米片从层状多晶粉末中剥离，然后与C ₆₀纳米粒子组装在一起，通过同时提高功率因数和降低热导率产生了新型的柔性n型热电材料。所得的C ₆₀ / TiS ₂杂化膜在400 K时的ZT约为0.3，远远优于现有的溶液印刷和柔性n型热电材料。特别地，这种热电性质可与单晶基于TiS ₂的热电材料相媲美，后者昂贵，难以合成并且不适合溶液印刷。C ₆₀ / TiS ₂混合溶液也用作印刷大面积柔性和空间热电器件的油墨。在20 K的温度梯度下产生了1.68 W m ^-2的出色输出功率。这项工作为柔性，可溶液印刷的，用于柔性电子产品的高性能热电材料铺平了道路。