Microstructure and Thermoelectric Properties of (Bi2Te3)1-x(CdTe)x Composites

• Main Authors: Wu-Jui Huang, 黃吳叡
• Other Authors: Ching-Cheng Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/88386508341906952398

碩士 === 國立東華大學 === 材料科學與工程學系 === 97 === In this study, thermoelectric materials with microstructures were designed to enhance its thermoelectric properties. Bi2Te3 was selected as a base-material and an insoluble semiconductor material CdTe with wider energy band gap was incorporated to form microstructure in it. For these purpose, a series of two-component composites (Bi2Te3)1-x(CdTe)x, with x=0.01, 0.05, 0.1, 0.15, 0.2 were prepared by melting, high speed rocking and quenching. The composition and microstructure of these composites were examined by X-ray and SEM. Measurements of Seebeck coefficient, electric resistively, and thermal conductivity were carried out from 30K to 400K. The compositional and temperature dependence of the microstructure and thermoelectric properties of (Bi2Te3)1-x(CdTe)x composites were discussed in detail. It is showed that (Bi2Te3)1-x(CdTe)x may exhibit the better thermoelectric properties than Bi2Te3 in some temperature range. The figure of merit (ZT) of (Bi2Te3)1-x(CdTe)x is about 0.52 with x=0.01 at 300K.