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.

柔性热电材料（TE）因其在弯曲/非平面界面上具有可匹配的热通量值而被用于自供电电子设备和热量收集器中，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 _0.4 Sb _1.6 Te ₃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。具体而言，薄膜实现了高达45 μW cm ^-1 K ^-2的超高功率因数，并在室温下经过1,000次弯曲循环后表现出适度的电导率变化（<10%）。此外，我们还提出了高达 100 cm ²的大面积、经济高效的薄膜和柔性发电机，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。这种柔性 TE 不仅可以作为理解无机 TE 薄膜结构-性能相关性的框架，同时也为可穿戴电子产品和可持续热量收集提供了可行性。