Effects of Different Amount of Se-doping on Microstructures and Thermoelectric Properties of n-type Bi$lt;inf$gt;2$lt;/inf$gt;Te$lt;inf$gt;3-x$lt;/inf$gt;Se$lt;inf$gt;x$lt;/inf$gt;
Year: 2014
Type: article
Abstract: A hydrothermal method combined with a subsequent spark plasma sintering technique was successfully utilized to synthesize selenium (Se) doped bismuth telluride (Bi 2 Te 3-x Se x ) (0≤x≤0.45).The influence of Se-doping on the composition and morphology of n-type Bi 2 Te 3-x Se x was studied by X-ray diffraction, scanning electron microscope and transmission electron microscope.Thermoelectric properties of the as-prepared bulk Bi 2 Te 3-x Se x nanocomposites were investigated in detail.Results showed that the grain became finer by the Se-doping.With increasing Se doping content, the electrical conductivity of bulk Bi 2 Te 3-x Se x increased firstly and then decreased.Se-doping effectively reduced the thermal conductivity and improved the Seebeck coefficient to some extent.Consequently, a maximum ZT value of 0.57 was obtained from bulk Bi 2 Te 2.7 Se 0.3 at 475 K, which was increased by 159% as compared with pure bulk Bi 2 Te 3 .
Source: Journal of Inorganic Materials
DOI: 10.15541/jim20140085
Authors: ZHANG Qi-Hao, XU Lei-Lei, WANG Lian-Jun, JIANG Wan
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2316783755