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Design and Fabrication of Segmented GeTe/(Bi,Sb)2Te3 Thermoelectric Module with Enhanced Conversion Efficiency
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-02-23 , DOI: 10.1002/adfm.202214771 Jun Pei 1, 2 , Jian‐Lei Shi 2 , Hezhang Li 3 , Yilin Jiang 1 , Jinfeng Dong 1 , Hua‐Lu Zhuang 1 , Bowen Cai 1 , Bin Su 1 , Jincheng Yu 1 , Wei Zhou 2 , Bo‐Ping Zhang 2 , Jing‐Feng Li 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-02-23 , DOI: 10.1002/adfm.202214771 Jun Pei 1, 2 , Jian‐Lei Shi 2 , Hezhang Li 3 , Yilin Jiang 1 , Jinfeng Dong 1 , Hua‐Lu Zhuang 1 , Bowen Cai 1 , Bin Su 1 , Jincheng Yu 1 , Wei Zhou 2 , Bo‐Ping Zhang 2 , Jing‐Feng Li 1
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GeTe and (Bi,Sb)2Te3 are two representative thermoelectric (TE) materials showing maximum performance at middle and low temperature, respectively. In order to achieve higher performance over the whole temperature range, their segmented one-leg TE modules are designed and fabricated by one-step spark plasma sintering (SPS). To search for contact and connect layers, the diffusion behavior of Fe, Ni, Cu, and Ti metal layers in GeTe is studied systematically. The results show that Ti with a similar linear expansivity (10.80 × 10−6 K−1) to GeTe, has low contact resistance (3 µΩ cm2) and thin diffusion layer (0.4 µm), and thus is an effective metallization layer for GeTe. The geometric structure of the GeTe/(Bi,Sb)2Te3 segmented one-leg TE module and the ratio of GeTe to (Bi,Sb)2Te3 are determined by finite element simulation method. When the GeTe height ratio is 0.66, its theoretical maximum conversion efficiency (ηmax) can reach 15.9% without considering the thermal radiation and thermal/electrical contact resistance. The fabricated GeTe/(Bi,Sb)2Te3 segmented one-leg TE module showed a ηmax up to 9.5% with a power density ≈ 7.45 mW mm−2, which are relatively high but lower than theoretical predictions, indicating that developing segmented TE modules is an effective approach to enhance TE conversion efficiency.
中文翻译：
具有增强转换效率的分段 GeTe/(Bi,Sb)2Te3 热电模块的设计与制造
GeTe和(Bi,Sb) 2 Te 3是两种具有代表性的热电(TE)材料，分别在中温和低温下表现出最佳性能。为了在整个温度范围内实现更高的性能，他们的分段单腿 TE 模块采用一步放电等离子烧结 (SPS) 设计和制造。为了寻找接触层和连接层，系统地研究了 GeTe 中 Fe、Ni、Cu 和 Ti 金属层的扩散行为。结果表明，与 GeTe具有相似线性膨胀率 (10.80 × 10 −6 K −1 ) 的 Ti，具有较低的接触电阻 (3 µΩ cm 2) 和薄扩散层 (0.4 µm), 因此是 GeTe 的有效金属化层。通过有限元模拟方法确定了GeTe/(Bi,Sb) 2 Te 3分段单脚TE模块的几何结构和GeTe与(Bi,Sb) 2 Te 3的比值。当GeTe高度比为0.66时，在不考虑热辐射和热/电接触电阻的情况下，其理论最大转换效率（η max ）可达15.9%。制造的 GeTe/(Bi,Sb) 2 Te 3分段单腿 TE 模块显示 η最大值高达 9.5%，功率密度 ≈ 7.45 mW mm -2, 相对较高但低于理论预测，表明开发分段 TE 模块是提高 TE 转换效率的有效途径。
更新日期：2023-02-23
中文翻译：
具有增强转换效率的分段 GeTe/(Bi,Sb)2Te3 热电模块的设计与制造
GeTe和(Bi,Sb) 2 Te 3是两种具有代表性的热电(TE)材料，分别在中温和低温下表现出最佳性能。为了在整个温度范围内实现更高的性能，他们的分段单腿 TE 模块采用一步放电等离子烧结 (SPS) 设计和制造。为了寻找接触层和连接层，系统地研究了 GeTe 中 Fe、Ni、Cu 和 Ti 金属层的扩散行为。结果表明，与 GeTe具有相似线性膨胀率 (10.80 × 10 −6 K −1 ) 的 Ti，具有较低的接触电阻 (3 µΩ cm 2) 和薄扩散层 (0.4 µm), 因此是 GeTe 的有效金属化层。通过有限元模拟方法确定了GeTe/(Bi,Sb) 2 Te 3分段单脚TE模块的几何结构和GeTe与(Bi,Sb) 2 Te 3的比值。当GeTe高度比为0.66时，在不考虑热辐射和热/电接触电阻的情况下，其理论最大转换效率（η max ）可达15.9%。制造的 GeTe/(Bi,Sb) 2 Te 3分段单腿 TE 模块显示 η最大值高达 9.5%，功率密度 ≈ 7.45 mW mm -2, 相对较高但低于理论预测，表明开发分段 TE 模块是提高 TE 转换效率的有效途径。
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