Controlled growth of bismuth antimony telluride Bi Sb2−Te3 nanoplatelets and their bulk thermoelectric nanocomposites

Compositionally tunable ternary Bi2(Se1−xTex)3 and (Bi1−ySby)2Te3 thin films via low pressure chemical vapour deposition

“…The E 2 g vibrational mode shifts from 100 to 120 cm change in composition of the solid solution of the ternary phase. This is consistent with Raman spectra of (Bi 1Ày Sb y ) 2 Te 3 deposited by solvothermal synthesis 47 and MBE. 37 …”

Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure

“…These values are comparable with those found in literature for the Bi-Sb-Te system. 24,25,27,35,39,40 We have calculated the electronic contribution to the thermal conductivity, using a Lorentz number of 1.6x10 - 8 27 , and found that the lattice contribution at room temperature is about 85.3% in Bi0.35Sb1.65Te3.…”

“…23 Zhang et al achieved a zT=0.51 in optimized Bi0.5Sb1.5Te3 by a controlled synthesis of nanoplatelets and its sintering through SPS to form bulk nanocomposites, as a scalable bottom-up process. 24 Luo et al reported on one of the highest figure of merit of 1.71 in Bi0.5Sb1.5Te3 obtained by the optimization of traditional melting-solidification method under a variable intensity magnetic field, and described a complete study of this method. 25 An improvement in average ZT reaching 1.18 in the temperature range of 300-480 K was achieved by Hu et al displaying a peak ZT=1.3 measured in Bi0.3Sb1.7Te3 due to the resulting morphology of the samples prepared by melting and hot-deformation method.…”

Thermoelectric Transport in Nanocomposites

“…Bi 2 Te 3 -based materials are most widely used as commercial TE materials for solid-state refrigeration and thermal management near room temperature [51,52,53]. The maximum ZTs of p -type (Bi x Sb 1− x ) 2 Te 3 alloy and n -type Bi 2 (Te y Se 1− y ) 3 alloy are about 1 for a long time.…”