Printed Lateral p–n Junction for Thermoelectric Generation

IF 11.1 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Small Science Pub Date : 2024-08-13 DOI:10.1002/smsc.202400257

Md Mofasser Mallick, Leonard Franke, Mohamed Hussein, Andres Georg Rösch, Zhongmin Long, Yolita Maria Eggeler, Uli Lemmer

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Abstract

Printed thermoelectric generators (TEGs) show promising potential for converting waste heat into useful electricity at a low cost but fall short of exhibiting a conversion efficiency anticipated from materials’ properties. The output power of conventionally printed TEGs in the “π-type” geometry suffers due to low thermal voltage and low current because of high thermal and electrical contact resistance, respectively. Herein, a type of printed p–n junction TEGs (PN-TEGs) as a possible remedy is explored. Two printed PN-TEGs with different thicknesses are fabricated using printed p-type Bi_0.5Sb_1.5Te₃ and n-type Bi₂Te_2.7Se_0.3 materials. The PN-TEGs show a promising way to minimize the influence of thermal and electrical resistance in printed TEGs. In the experimental and simulation results, the significant impact of PN-TEGs’ dimensions on their power outputs is revealed. Also, a conventional “π-type” printed TEG is fabricated and its performance is studied. The optimized PN-TEG with a single thermocouple yields ≈14 times higher power output density of 5.3 μW cm⁻² at a ΔT of 25 K compared to “π-type” printed TEGs.

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用于热发电的印刷侧 p-n 结

印刷热电发电机（TEG）在以低成本将废热转化为有用电能方面显示出巨大的潜力，但却无法达到根据材料特性所预期的转化效率。传统的 "π型 "印刷 TEG 的输出功率较低，原因是热电压和电流较低，分别是因为热阻和电接触电阻较大。在此，我们探讨了一种可作为补救措施的印刷 p-n 结 TEG（PN-TEG）。我们使用印刷的 p 型 Bi0.5Sb1.5Te3 和 n 型 Bi2Te2.7Se0.3 材料制作了两种不同厚度的印刷 PN-TEG 。PN-TEG 为最大限度地减少印刷 TEG 中热阻和电阻的影响提供了一种可行的方法。实验和模拟结果表明，PN-TEG 的尺寸对其功率输出有显著影响。此外，还制作了传统的 "π型 "印刷 TEG 并对其性能进行了研究。与 "π型 "印刷 TEG 相比，经过优化的 PN-TEG 带有单个热电偶，在 25 K 的 ΔT 条件下，功率输出密度≈14 倍，达到 5.3 μW cm-2。

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来源期刊

Small Science

CiteScore

14.00

自引率

2.40%

发文量

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