Influence of Sb and Se Doping Amount on Thermoelectric Properties of Bi2Te3 Materials
To clarify the effect of Sb and Se doping amount on the thermoelectric properties of Bi2Te3 materials,P-type Bi2Te3 materials with different Sb doping contents and N-type Bi2Te3 materials with different Se doping contents were prepared by melting method.Through SEM and EDS analysis,thermoelectric performance test,etc.,the effects of Sb and Se doping on the thermoelectric properties of Bi2Te3 materials such as electric conductivity,Seebeck coefficient,thermal conductivity,and thermoelectric figure were studied.With the increase of Sb doping content,the conductance of P-type Bi2Te3 first increased and then decreased,the Seebeck coefficient first decreased and then increased,the thermal conductivity decreased,and the thermoelectric figure of merit first increased and then decreased.With the increase of Se doping content,the conductance of N-type Bi2Te3 increases first and then decreases,the Seebeck coefficient decreases first and then increases,the thermal conductivity decreases,and the thermoelectricity figure of merit increases.When the Sb doping content is 22.5%,the thermoelectric figure of merit of P-type Bi2Te3 at 175℃is the largest,which is 0.83.When the Se doping content is 5%,the thermoelectric figure of merit of N-type Bi2Te3 at 175℃is the largest,which is 1.33.
Bi2Te3dopingelectric conductivitySeebeck coefficientthermal conductivitythermoelectric figure of merit
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