Flexible thermoelectrics (TEs) have been used in self-powered electronics and heat harvesters due to their matchable heat flux values across curved/non-flat interfaces, aiming to achieve a balance between thermoelectricity, flexibility, and scalability. In this work, we constructed Bi_0.4Sb_1.6Te₃ thin films with a high density of annealing twin boundaries to simultaneously modulate the carrier concentration, Seebeck coefficient, mobility, and local strain propagation. Specifically, the thin films achieved an ultrahigh power factor reaching 45 μW cm⁻¹ K⁻² and demonstrated modest electrical conductivity variations (<10%) after 1,000 bending cycles at room temperature. Furthermore, we presented a large-area, cost-effective thin film of up to 100 cm² and a flexible generator with an impressive maximum power density of 69 W m⁻² at a temperature difference of 56.8 K. This flexible TE could not only serve as a framework for comprehending the structure-property correlation in inorganic TE thin films but also provide feasibility for wearable electronics and sustainable heat harvesting.

中文翻译：

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具有高热电性能的双边界增强柔性 Bi0.4Sb1.6Te3 薄膜的可扩展和可持续制造


柔性热电技术 （TE） 因其在弯曲/非平面界面上的匹配热通量值而被用于自供电电子设备和热收集器，旨在实现热电、灵活性和可扩展性之间的平衡。在这项工作中，我们构建了具有高密度退火孪晶界的 Bi_0.4Sb_1.6Te₃ 薄膜，以同时调节载流子浓度、塞贝克系数、迁移率和局部应变传播。具体来说，薄膜实现了达到 45 μW ^{cm-1 K-2} 的超高功率因数，并且在室温下弯曲 1,000 次后表现出适度的电导率变化 （<10%）。此外，我们还提出了一种高达 100 cm² 的大面积、经济高效的薄膜和一种柔性发生器，在 56.8 K 的温差下，最大功率密度为 69 W ^m-2，令人印象深刻。这种灵活的 TE 不仅可以作为理解无机 TE 薄膜结构-性能相关性的框架，还可以为可穿戴电子设备和可持续热收集提供可行性。