The construction of high-density thermoelectric (TE) pairs on small TE devices to improve the utilization of thermal energy has garnered extensive attention. The fabrication of high-density TE pairs in fiber-shaped TE devices with curved surfaces remains challenging. Herein, we report a flexible scrolled TE module with interlayers of radial heterojunction that possesses high-density p-n junctions, accomplished by rolling a patterned carbon nanotube film (active material layer) and a cellulose acetate nanofiber membrane (insulation). This module achieves high integration of ~3.32 mm³ per TE pair and a high output voltage density of ~65.4 mV/cm² at a temperature difference of 41 K when the length of the scrolled module is 2 cm. Furthermore, a fiber-shaped TE device is designed by interconnecting the scrolled modules. The design of p-n junctions in the axial and radial directions of the fiber-shaped device is realized, and an open-circuit voltage (V_oc) density of 0.176 mV/(cm·K) is achieved. In addition, the fiber-shaped TE device can be woven with commercial yarns to construct TE fabric for harvesting the thermal energy of the human body through alternating scrolled modules. This indicates its potential application for the harvesting of wearable energy.

在小型热电器件上构建高密度热电（TE）对以提高热能利用率已引起广泛关注。在具有曲面的纤维形 TE 器件中制造高密度 TE 对仍然具有挑战性。在这里，我们报告了一种具有高密度 pn 结的径向异质结夹层的柔性滚动 TE 模块，通过滚动图案化碳纳米管膜（活性材料层）和醋酸纤维素纳米纤维膜（绝缘）来实现。^{该模块实现了每 TE 对约 3.32 mm 3}的高集成度和约65.4 mV/cm ^{2的高输出电压密度}当滚动模块的长度为 2 cm 时，温差为 41 K。此外，通过将滚动模块互连，设计了一种纤维形 TE 器件。实现了纤维状器件轴向和径向pn结的设计，实现了0.176 mV/(cm·K)的开路电压( Voc ₎密度。此外，纤维状的热电设备可以与商业纱线编织成热电织物，通过交替的滚动模块来收集人体的热能。这表明它在收集可穿戴能源方面的潜在应用。