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Review on research progress of bismuth telluride thermoelectric materials

2019-01-31

Thermoelectric material, also known as thermoelectric power generation material, is a new type of functional material that USES Seebeck effect and Peltier effect to convert heat energy into electric energy. It can not only use its thermoelectric power generation function to convert heat energy into electric energy efficiently, but also use its thermoelectric refrigeration function to facilitate refrigeration.Thermoelectric conversion devices made of thermoelectric materials have the advantages of pollution-free, long life, easy maintenance, small size, light weight and noise-free in work. They are mostly used in the fields of space, nuclear power, waste heat utilization and refrigeration.
 

 

 

Bi2Te3 is the earliest and most mature thermoelectric material. It has higher conductivity and lower thermal conductivity. It is the most commonly used thermoelectric material at room temperature.In recent years, with the in-depth research on Bi2Te3 thermoelectric materials, the optimization of their thermoelectric properties mainly focuses on the use of nanotechnology to reduce the dimensions of Bi2Te3 thermoelectric materials and the improvement of their properties through doping process.

Bismuth Telluride  is largely called associate degree economical thermoelectrical material. Nowadays, it's been attracted an excellent deal of interest in energy harvest, chip cooling, chip sensing and alternative field of fabric science owing to its potential applications. so as to supply Bi2Te3 nanostructure, variety of ways like solvo and hydro thermal, refluxing, undemanding arc–melting and polyol ways are used. Among of them, the solvothermal methodology has been one among the foremost common ways to fabricate Bi2Te3 nanostructure in thermoelectrical applications. however the event of device–quality material has been a difficult task for the researchers, yet. For this reason, this paper provides a review of current analysis activities on Bi2Te3 nanostructure growth by many ways and its characterization through theoretical and analytical aspects. Moreover, the paper handles a scientific and intensive analysis work to develop and perceive the materials in nanostructure forms.


 


The undefeated exfoliation of atomically-thin atomic number 83 bismuth Telluride (Bi2Te3) quintuple layer (QL) attracts tremendous analysis interest during this powerfully anharmonic quasi-two-dimensional material. The thermal transport properties of this material aren't well understood, particularly the mode-wise properties and once it's plus a substrate. during this work, we've got performed molecular dynamics simulations and traditional mode analysis to review the mode-resolved thermal transport in separate and supported Bi2Te3 QL. The elaborated mode-wise phonon properties area unit calculated and therefore the accumulated thermal conductivities with relevance phonon mean free path (MFP) area unit made. it's shown that hour of the thermal transport is contributed by phonons with MFP longer than 20 nm. Coupling with a-SiO2 substrate ends up inregarding hour reduction of thermal conduction. Through variable the surface coupling strength and therefore themass of substrate, we have a tendency to additionally realize that phonon in Bi2Te3 QL is additional powerfully scattered by surface potential and its transport method is a smaller amount stricken by the dynamics of substrate. Our study provides associate degree in-depth understanding of warmth transport in Bi2Te3 QL and is useful in more craft its thermal property through nanostructuring.