Electrochemical organized p-type Bi2Te3thermoelectric nanowire array
Wei Wang1,Qinghua Huang1, Jing Zhu1, Jianzhong Zhang2
1Dept.of Applied Chem., School of Chem. Eng. and Tech., Tianjin University , Tianjin300072, P. R. China
2TianjinInstitute of Power Sources, Tianjin 300381, P. R. China
P-type Bi2Te3 thermoelectricmaterials have been organized into the nano-pores of alumina films byelectrodeposition in the solutions containing Bi+3 and HTe3-1,and one-dimensional thermoelectric materials with nanowire array structure havebeen obtained. The results show that the doping content of tellurium in Bi2Te3nanowires can be easily controlled during the electrochemical organizingprocess by adjusting the deposition potential. The filling ratio of nanowiresin the pores of alumina films highly correlates with the structural uniformityof alumina film, the ionic concentration of Bi+3 and HTe3-1in the solution and the depositing rate of the nanowires. The TEManalyses indicate that the P-type Bi2Te3 nanowireselectrodeposited into the nano-pores of alumina film possess polycrystalstructure. The performance measurement verified that as the thermoelectric materials areelectrochemically organized into nanowire array structure, their Seebeckcoefficient α can be improved greatly.