Converting body heat into electricity using flexible thermoelectric generators can be useful for self-powered wearable electronic devices. However, the temperature difference that can be obtained by body heat is insufficient, which limits its practical applications. In this study, we present a wearable solar thermoelectric generator driven by a significantly high temperature difference created by introducing a local solar absorber and thermoelectric legs on a polyimide substrate. The solar absorber is a five-period Ti/MgF₂ superlattice, in which the structure and thickness of each layer was designed for optimal absorption of sunlight. The thermoelectric legs were prepared by dispenser printing with an ink consisting of mechanically alloyed BiTe-based powders and an Sb₂Te₃-based sintering additive dispersed in glycerol. Thermoelectric p- and n-type legs have electrical conductivities of ~ 25000 S m⁻¹ with Seebeck coefficients of 166.37 and −116.38 μV K⁻¹, respectively. When exposed to sunlight, a wearable solar thermoelectric generator comprising 10 pairs of p-n legs has an open-circuit voltage of 55.15 mV and an output power of 4.44 μW. The temperature difference is as high as 20.9 °C, which is much higher than the typical temperature differences of 1.5 to 4.1 °C of wearable thermoelectric generators driven by body heat. The wearable solar thermoelectric generators have been demonstrated on various surfaces exposed to sunlight, such as clothes or windows.

中文翻译：

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前所未有的高温差驱动的可穿戴太阳能热电发电机

使用柔性热电发电机将体热转换为电能可用于自供电的可穿戴电子设备。然而，通过体热可获得的温差不足，这限制了其实际应用。在这项研究中，我们介绍了一种可穿戴式太阳能热电发电机，该发电机由明显的高温差驱动，该高温差是通过在聚酰亚胺基板上引入局部太阳能吸收器和热电腿而产生的。太阳能吸收器是五周期的Ti / MgF ₂超晶格，其中每一层的结构和厚度都经过设计，可以最佳地吸收太阳光。通过使用由机械合金化的BiTe基粉末和Sb ₂ Te ₃组成的油墨进行分配器印刷来制备热电腿。基烧结助剂，分散在甘油中。p型和n型热电腿的电导率为〜25000 S m ^-1，塞贝克系数分别为166.37和-116.38μVK ^-1。当暴露在阳光下时，包括10对pn脚的可穿戴式太阳能热电发电机的开路电压为55.15 mV，输出功率为4.44μW。温度差高达20.9°C，远高于由体热驱动的可穿戴热电发电机的典型温度差1.5至4.1°C。可穿戴式太阳能热电发电机已经在暴露于阳光下的各种表面（例如衣服或窗户）上进行了演示。