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Realizing record high performance in n-type Bi2Te3-based thermoelectric materials
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0ee01349h Bin Zhu 1, 2, 3, 4, 5 , Xixi Liu 1, 2, 3, 4 , Qi Wang 2, 3, 4, 6 , Yang Qiu 1, 2, 3, 4 , Zhong Shu 1, 2, 3, 4 , Zuteng Guo 1, 2, 3, 4 , Yao Tong 1, 2, 3, 4 , Juan Cui 1, 2, 3, 4 , Meng Gu 2, 3, 4, 6 , Jiaqing He 1, 2, 3, 4, 7
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0ee01349h Bin Zhu 1, 2, 3, 4, 5 , Xixi Liu 1, 2, 3, 4 , Qi Wang 2, 3, 4, 6 , Yang Qiu 1, 2, 3, 4 , Zhong Shu 1, 2, 3, 4 , Zuteng Guo 1, 2, 3, 4 , Yao Tong 1, 2, 3, 4 , Juan Cui 1, 2, 3, 4 , Meng Gu 2, 3, 4, 6 , Jiaqing He 1, 2, 3, 4, 7
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The application of Bi2Te3-based power generation is seriously hindered by the poor n-type samples, demonstrating a strong demand for high-performance n-type Bi2Te3-based thermoelectric (TE) materials. However, the strong relationship between thermal and electrical transport limits the improvement of the TE properties. Here, we propose a strategy to enhance the Seebeck coefficient while retaining a large electrical conductivity in n-type (Bi,Sb)2(Te,Se)3 materials through introducing electron transport potential wells and texturing. The thermal conductivity was also successfully decreased by constructing multi-scale phonon scattering structures. Consequently, a record maximum and average thermoelectric figure of merit (ZT) of ∼1.4 and ∼1.3 were achieved in the Bi1.8Sb0.2Te2.7Se0.3 + 15 wt% Te sample at a temperature of 300–575 K. A TE power generation module was fabricated with this n-type material and a home-made p-type Bi2Te3 sample. It demonstrated a record conversion efficiency of 6.6% at a temperature gradient of 235 K, representing about an 88% improvement compared with a commercial zone-melt Bi2Te3-based module.
中文翻译：
在n型Bi2Te3基热电材料中实现创纪录的高性能
劣质的n型样品严重阻碍了Bi 2 Te 3基发电的应用，这表明对高性能n型Bi 2 Te 3基热电（TE）材料的强烈需求。但是，热和电传输之间的紧密关系限制了TE性能的提高。在这里，我们提出了一种在保留n型（Bi，Sb）2（Te，Se）3大导电率的同时提高塞贝克系数的策略。通过引入电子传输势阱和纹理化材料。通过构建多尺度声子散射结构也成功降低了热导率。因此，在300–575 K的温度下，Bi 1.8 Sb 0.2 Te 2.7 Se 0.3 + 15 wt％Te样品获得了创纪录的最大热电平均品质因数（ZT）〜1.4和〜1.3。A TE电源使用这种n型材料和自制的p型Bi 2 Te 3样品制造了发电模块。在235 K的温度梯度下，它的转换效率达到了创纪录的6.6％，与商用的区域熔融Bi相比，提高了约88％。2基于Te 3的模块。
更新日期：2020-07-15
中文翻译：
在n型Bi2Te3基热电材料中实现创纪录的高性能
劣质的n型样品严重阻碍了Bi 2 Te 3基发电的应用，这表明对高性能n型Bi 2 Te 3基热电（TE）材料的强烈需求。但是，热和电传输之间的紧密关系限制了TE性能的提高。在这里，我们提出了一种在保留n型（Bi，Sb）2（Te，Se）3大导电率的同时提高塞贝克系数的策略。通过引入电子传输势阱和纹理化材料。通过构建多尺度声子散射结构也成功降低了热导率。因此，在300–575 K的温度下，Bi 1.8 Sb 0.2 Te 2.7 Se 0.3 + 15 wt％Te样品获得了创纪录的最大热电平均品质因数（ZT）〜1.4和〜1.3。A TE电源使用这种n型材料和自制的p型Bi 2 Te 3样品制造了发电模块。在235 K的温度梯度下，它的转换效率达到了创纪录的6.6％，与商用的区域熔融Bi相比，提高了约88％。2基于Te 3的模块。
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