Flexible thermoelectric generators (TEGs) have been considered as a promising power source for rapidly developing wearable microelectronic devices, but how to integrate high‐performance materials and device design to prepare an available wearable TEGs is still challenging. In this study, n‐type silver selenide (Ag2Se) and p‐type copper selenide (Cu2Se) films are prepared by in situ full metal selenization strategy combined with screen‐printing technique, avoiding a high‐temperature process and expensive equipments. Further, a 3D structured thermoelectric module with 42 thermoelectric p‐n leg pairs is designed and configured by vertically embedding Ag₂Se and Cu₂Se thin films into a 4 mm‐thick silicone layer that provides insulation and structural support. The device consistently delivers power, achieving the maximum open‐circuit voltage of 113 mV at a temperature difference of 60 K, with a maximum power density of 234.3 µW cm−2. Under bending stress, the flexible TEG still has 81% retention rate of initial power density after 1500 bending cycles, indicating the good bending property. It can also generate a voltage of 3.6 and 7 mV, respectively, when worn on an arm with or without a fan expanding temperature difference. The work highlights a simple method to obtain efficient selenide thermoelectric films for cost‐effective flexible 3D structured TE devices.

中文翻译：

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用于可穿戴热电发电机的原位合成交错层增强柔性 Ag2Se 和 Cu2Se 薄膜


柔性热电发电机 （TEG） 一直被认为是快速开发可穿戴微电子设备的有前途的电源，但如何将高性能材料和设备设计集成以制备可用的可穿戴 TEG 仍然具有挑战性。本研究采用原位全金属硒化策略结合丝网印刷技术制备了 n 型硒化银 （Ag2Se） 和 p 型硒化铜 （Cu2Se） 薄膜，避免了高温工艺和昂贵的设备。此外，通过将 Ag₂Se 和 Cu₂Se 薄膜垂直嵌入 4 mm 厚的硅层中，提供绝缘和结构支撑，设计和配置了具有 42 个热电 p-n 脚对的 3D 结构热电模块。该器件始终如一地提供功率，在 60 K 的温差下实现了 113 mV 的最大开路电压，最大功率密度为 234.3 μW cm−2。在弯曲应力下，柔性 TEG 在 1500 次弯曲循环后仍具有 81% 的初始功率密度保持率，表明具有良好的弯曲性能。当佩戴在手臂上时，无论是否有风扇扩大温差，它还可以分别产生 3.6 mV 和 7 mV 的电压。这项工作强调了一种获得高效硒化物热电薄膜的简单方法，用于经济高效的柔性 3D 结构化 TE 器件。