Abstract
In the present study, the temperature dependences of the thermoelectromotive force (thermo–emf) in copper selenide, substituted in a small concentration, were studied. The results of the measurements showed that the thermo–emf coefficient of the samples increases, and the conductivity decreases with increasing silver concentration in its composition. These results allow – with optimal selection of the doping regime and protective coatings – to develop on the basis of nanostructured copper selenide an effective thermoelectric for use at temperatures of 20–500°C as p–type semiconductors suitable for increasing the efficiency of thermoelectric generators.
Highlights
Modern thermoelectric converters have a number of advantages over traditional electric generators: simplicity of design, absence of moving parts, noiselessness of operation, high reliability, possibility of miniaturization without loss of efficiency.In order for thermoelectric generators to become more competitive than conventional power sources, thermoelectric materials should achieve high performance ZT ≥ 4 [1]
This indicator is a guide in the search and synthesis of new promising materials that can become the basis for industrially produced thermoelectric devices in the foreseeable future (20 to 25 years)
Results of measurements have shown that temperature dependences of coefficient of electronic copper of thermo-eds nanocrystal sulfides which cationic sublattice has been alloyed by sodium, with the general chemical formula NaхCu2-хS (x = 0.05; 0.1; 0.15; 0.2)
Summary
Modern thermoelectric converters have a number of advantages over traditional electric generators: simplicity of design, absence of moving parts, noiselessness of operation, high reliability, possibility of miniaturization without loss of efficiency.In order for thermoelectric generators to become more competitive than conventional power sources, thermoelectric materials should achieve high performance ZT ≥ 4 [1]. Achieving the optimal combination of all three properties at the same time to obtain a high thermoelectric figure of merit is a complex task.
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