Direct ink writing of three-dimensional thermoelectric microarchitectures
Direct ink writing of three-dimensional thermoelectric microarchitectures
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DOI：
10.1038/s41928-021-00622-9
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发表时间：
2021-08-09
影响因子：
34.3
通讯作者：
Son, Jae Sung
中科院分区：
文献类型：
--
作者：
Kim, Fredrick;Yang, Seong Eun;Son, Jae Sung
通过直接写入基于颗粒的热电墨水，可以制造出微尺度的三维热电结构，并用于制造功率密度为479.0µW cm(-2)的微温差发电机。微温差电模块可用作集成系统中的能量采集器、主动致冷器和热传感器。然而，用传统的微加工工艺制造这类模块的成本很高，而且只能生产二维热电薄膜，这限制了高温梯度的形成，从而限制了发电量。在这里，我们展示了可以通过直接写入基于颗粒的热电墨水来制造微尺度的三维热电结构。利用尺寸控制和表面氧化，(Bi，Sb)(2)(Te，Se)(3)颗粒油墨的特性被设计成具有高粘弹性且不含有机粘结剂的胶体油墨，并使用3D打印工艺将油墨直接写入复杂的结构中。所得到的结构具有高的热电优值系数，分别为1.0(p型)和0.5(n型)，与块材的热电优值相当。由三维写入垂直灯丝制成的微型热电发生器具有大的温度梯度和479.0微瓦厘米(-2)的功率密度。
Microscale three-dimensional thermoelectric architectures can be fabricated through the direct writing of particle-based thermoelectric inks and used to create microthermoelectric generators that exhibit a power density of 479.0 mu W cm(-2).Microthermoelectric modules can be used as energy harvesters, active coolers and thermal sensors in integrated systems. However, manufacturing such modules with traditional microfabrication processes is costly and produces only two-dimensional thermoelectric films, which limit the formation of high-temperature gradients and thus the amount of power generated. Here we show that microscale three-dimensional thermoelectric architectures can be fabricated through the direct writing of particle-based thermoelectric inks. Using size control and surface oxidation, the characteristics of (Bi,Sb)(2)(Te,Se)(3)-based particle inks are engineered to create colloidal inks with high viscoelasticity and without organic binders, and the inks are directly written into complex architectures using a 3D printing process. The resulting structures exhibit high thermoelectric figures of merit of 1.0 (p type) and 0.5 (n type), which are comparable to those of bulk ingots. Microthermoelectric generators made from three-dimensionally written vertical filaments exhibit large temperature gradients and a power density of 479.0 mu W cm(-2).