Investigation of the Microstructural and Thermoelectric Properties of the (GeTe) _0.95(Bi2Te3) 0.05 Composition for Thermoelectric Power Generation Applications

Abstract

In the frame of the current research, thep-type Bi2Te3doped (GeTe)0.95(Bi2Te3)0.05alloy composed of hot pressed consolidated submicron structured powder was investigated. The influence of the process parameters (i.e., powder particles size and hot pressing conditions) on both reduction of the lattice thermal conductivity and electronic optimization is described in detail. Very high maximalZTvalues of up to∼1.6 were obtained and correlated to the microstructural characteristics. Based on the various involved mechanisms, a potential route for further enhancement of theZTvalues of the investigated composition is proposed.

Realization of non-equilibrium process for high thermoelectric performance Sb-doped GeTe

“…The involved sub-micron features and interfaces in this alloy serve as the center for phonons scattering, significantly reducing the lattice thermal conductivity. In Bi 2 Te 3 doped (GeTe) 0.95 (Bi 2 Te 3 ) 0.05 [35] , enhanced thermoelectric properties were achieved by optimizing the powder ball milling processing parameters resulting in sub-micro features which reduce the lattice thermal conductivity leading to enhanced ZT value of $1.6. Beyond that, various novel synthesis techniques were devoted to enhance the performance of thermoelectric materials [13,[36][37][38][39][40][41][42][43][44].…”

OptimizedZTofBi2Te3−GeTecompoun

“…Recently, [GeTe] 1.6 and 2.0, respectively, so the mixture of the two compounds could also be considered promising [20,21]. The GBT nano-wires were synthesized at various compositions, showing reduced dimensionality and electrical anisotropy enhance TE properties [22].…”

Highly efficient (In2Te3)x(GeTe)3−3x thermoelectric materials: a substitute for TAGS

“…15 Various structure modifications of GeTe have been investigated very recently, several of which achieved impressive thermoelectric performance. [16][17][18][19] In our work, we present the TE properties of another simple GeTe-based solid solution, namely (In 2 Te 3 ) x (GeTe) 3À3x . According to the GeTe-In 2 Te 3 pseudo binary phase diagram, 20 the single phase solid solutions exist over a large In 2 Te 3 concentration range, especially at high temperatures.…”