Thermoelectric properties of Cu-doped n-type (Bi2Te3)0.9–(Bi2−xCuxSe3)0.1(x=0–0.2) alloys

Anisotropic layered Bi2Te3-In2Te3 composites: control of interface density for tuning of thermoelectric properties

“…For the BTIT composites in the present work, the existence of both electrons and holes, especially the anisotropy not only from the Bi 2 Te 3 phase but also from the lamellar aligned microstructure, make the determination of the charge carrier concentration a complex issue. In the literature, Lorenz numbers in the range of 1.2…1.4 × 10 −8 for a Bi 2 Te 3 -based superlattice32 to 1.6…2.0 × 10 −8 for single-phase Bi 2 Te 3 333435 have been reported. The value 1.6 × 10 −8 , which is mostly used for composite materials3333435 and is also used in the present work.…”

“…In the literature, Lorenz numbers in the range of 1.2…1.4 × 10 −8 for a Bi 2 Te 3 -based superlattice32 to 1.6…2.0 × 10 −8 for single-phase Bi 2 Te 3 333435 have been reported. The value 1.6 × 10 −8 , which is mostly used for composite materials3333435 and is also used in the present work. Besides, Lorenz numbers calculated with the equation: and ranging from 1.8 to 2.2 were also tried out for the calculation of k LB .…”

Electrical and thermoelectric properties of single-wall carbon nanotube doped Bi2Te3

“…20 Addition of nanopowders in bulk materials is also an effective approach for improving the thermoelectric efficiency of bulk materials. 21,22 It has been reported that nanopowders of insulators, semiconductors, and metals, or nanosized cavities, can introduce crystal defects and increase the density of grain boundaries, causing strong scattering of long wavelength phonons and therefore, reducing the lattice thermal conductivity. Zhao et al 23 reported that the addition of SiC nanopowders resulted in a remarkable decrease in the thermal conductivity and improvement of mechanical properties of Bi 2 Te 3 -based alloys, leading to an increase of the figure of merit.…”

Effects of Cooling Rate on Thermoelectric Properties of n-Type Bi2(Se0.4Te0.6)3 Compounds

“…The density of states (DOS) near the Fermi level may be increased to enhance the thermoelectric power, or the scattering of phonons is intensified to reduce the lattice contribution to the thermal conductivity, both of which favor improvement of the figure of merit. [5][6][7][8] The other approach is so-called nanostructuring, where ball milling, 9,10 hydrothermal treatment, 11 or melt spinning techniques [12][13][14] are employed to generate nanostructures in ternary (Bi,Sb) 2 Te 3 bulk alloys. With the introduction of nanoinclusions in bulk (Bi,Sb) 2 Te 3 materials, this field has witnessed a truly dramatic breakthrough over the past 5 years.…”