Low-cost p-type Bi2Te2.7Se0.3 zone-melted thermoelectric materials for solid-state refrigeration
Low-cost p-type Bi2Te2.7Se0.3 zone-melted thermoelectric materials for solid-state refrigeration
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用于固态制冷的低成本p型Bi2Te2.7Se0.3区熔热电材料
DOI：
10.1016/j.jallcom.2020.154732
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发表时间：
2020
影响因子：
6.2
通讯作者：
Tiejun Zhu
中科院分区：
文献类型：
--
作者：
Qi Zhang;Renshuang Zhai;Teng Fang;Kaiyang Xia;Yehao Wu;Feng Liu;Xinbing Zhao;Tiejun Zhu
碲化铋基固溶体是一种独特的近室温热电材料，工业化的碲化铋基固溶体锭通常采用区域熔化法生长。用于固态制冷的传统p型组成为Bi 0.5Sb 1.5Te 3 +xwt% Te，但相对较高的晶格热导率阻碍了zT值的进一步提高，Sb和Te的高价增加了大规模商业应用的成本。本文系统地研究了p型Bi_（2-x）Sb_xTe_（2.7）Se_（0.3）ZM铸锭的TE特性。由于晶格热导率的降低和载流子浓度的优化的协同作用，Bi_（1.5）Sb_（0.5）Te_（2.7）Se_（0.3）在330 K附近获得了峰值T_（zT）= 1.05，与典型的p型Bi_（0.5）Sb_（1.5）Te_（3 +xwt% Te）ZM锭相当。此外，由于Sb和Te的含量较低，成本降低了约10%。相对较低的成本和相当的zT有利于TE工业的发展，并展示了Bi_2Te_3-Sb_2Te_3-Bi_2Se_3准三元固溶体的潜力。
Bismuth-telluride-based solid solutions are the unique thermoelectric (TE) materials near room temperature and the commercial ingots are usually grown by zone melting (ZM) method. The traditionalp-type composition used for solid-state refrigeration is Bi0.5Sb1.5Te3+xwt% Te, while the relatively high lattice thermal conductivity hinders the further enhancement ofzTvalues and the high prices of Sb and Te increase the cost of large-scale commercial applications. Herein, the TE properties ofp-type Bi2-xSbxTe2.7Se0.3ZM ingots are investigated systematically. Attributed to the synergistic role of decreased lattice thermal conductivity and optimized carrier concentration, a peakzT∼1.05 is obtained in Bi1.5Sb0.5Te2.7Se0.3around 330 K, which is comparable to the typicalp-type Bi0.5Sb1.5Te3+xwt% Te ZM ingots. Furthermore, the cost decreases by ∼10% due to the lower contents of Sb and Te. The comparablezTand lower cost are advantageous to TE industry and demonstrate the potential of Bi2Te3-Sb2Te3-Bi2Se3quasi-ternary solid solutions.