Printed Se-Doped MA n-Type Bi2Te3 Thick-Film Thermoelectric Generators
Printed Se-Doped MA n-Type Bi2Te3 Thick-Film Thermoelectric Generators
复制标题
印刷硒掺杂 MA n 型 Bi2Te3 厚膜热电发电机
DOI：
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发表时间：
2012
影响因子：
2.1
通讯作者：
J. Evans
中科院分区：
文献类型：
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作者：
D. Madan;A. Chen;P. Wright;J. Evans
在这项工作中，我们重点介绍了点胶印刷厚膜单元件热电发电机（TEG）的新材料加工发展和制造技术。印刷沉积技术允许低成本和可扩展的制造微型能源设备。这项工作的重点是合成独特的复合热电系统优化低温应用。我们还演示了高纵横比平面单元件teg高密度阵列的器件制造技术。以纯元素Bi和Te的摩尔比为36:64，以Se为添加剂制备了机械合金（MA） n型Bi2Te3粉末。采用x射线衍射（XRD）和扫描电镜（SEM）对粉末进行表征，确定了Bi2Te3相的形成和粒径在50 μm以下。在室温至100℃范围内测量了复合材料的热电性能。在300 K时，添加2 wt.% Se的MA n型bi2te3 -环氧复合材料的无因次优值（ZT）为0.17。在蒸发金触点聚酰亚胺衬底上制备了尺寸为5 mm × 400 μm × 120 μm的20单腿TEG原型。该原型器件在40 μA、40 mV电压、20℃温差下产生1.6 μW的输出功率。
In this work, we highlight new materials processing developments and fabrication techniques for dispenser-printed thick-film single-element thermoelectric generators (TEG). Printed deposition techniques allow for low-cost and scalable manufacturing of microscale energy devices. This work focuses on synthesis of unique composite thermoelectric systems optimized for low-temperature applications. We also demonstrate device fabrication techniques for high-density arrays of high-aspect-ratio planar single-element TEGs. Mechanical alloyed (MA) n-type Bi2Te3 powders were prepared by taking pure elemental Bi and Te in 36:64 molar ratio and using Se as an additive. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used to characterize the as-milled powders to confirm the Bi2Te3 phase formation and particle size below 50 μm. Thermoelectric properties of the composites were measured from room temperature to 100°C. We achieved a dimensionless figure of merit (ZT) of 0.17 at 300 K for MA n-type Bi2Te3–epoxy composites with 2 wt.% Se additive. A 20 single-leg TEG prototype with 5 mm × 400 μm × 120 μm printed element dimensions was fabricated on a polyimide substrate with evaporated gold contacts. The prototype device produced a power output of 1.6 μW at 40 μA and 40 mV voltage for a temperature difference of 20°C.