Influence of Se-doping and/or Bi addition on microstructure and thermoelectric properties of Cu_0.05Bi₂Te₃

详细信息    查看全文

• 作者：Song Chen^a ; ^b ; Kefeng Cai^a ; ^{kfcai@tongji.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shirley Shen^c
• 关键词：Bi2Te3 ; Thermoelectric ; Doping ; Nanostructure
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：599-603
• 全文大小：850 K

文摘

Cu_0.05Bi₂Se_xTe_3−x (x=0.2, 0.3, 0.4) bulk samples were prepared by hot pressing corresponding nanopowders synthesized by a gas-induced reduction method. Se doping significantly increases the carrier concentrations and hence the electrical conductivities of the samples. Based on this, a Cu_0.05Bi₂Se_0.3Te_2.7 sample with a higher power factor was chosen as a pristine sample; some of the Cu_0.05Bi₂Se_0.3Te_2.7 nanopowders were mixed with various amounts of Bi nanoparticles (NPs) and then hot pressed into bulk samples. The addition of Bi NPs promotes the sintering of samples. When the content of Bi NPs added is low (≤1 wt%), the electrical conductivity is higher than the pristine sample, and all the Bi NPs added samples have higher Seebeck coefficient than the pristine sample, hence, the power factor has been improved. A maximum power factor, 30.6 µWcm⁻¹ K⁻², has been obtained for the 2 wt% Bi NPs added sample.