Preparation of Bi2Te3 thermoelectric devices and interface optimization
Based on thermoelectric generation technology,the preparation of Bi2Te3 thermoelectric devices and the interface optimization to improve their thermoelectric properties were studied using simulation and experiment.Firstly,the thermoelectric device model was established by computer sim-ulation.By constructing a thermoelectric device composed of 71 pairs of particles,the simulation re-sults showed that the electromotive force generated was about 4.37 V under the temperature differ-ence of 150℃ between the hot and cold ends.In the experiment,the surface of Bi2Te3 particles was deoxidated by hydrogen plasma cleaning,and the elements before and after the treatment were detec-ted by X-ray photoelectron spectroscopy.It was found that the hydrogen plasma cleaning process could effectively remove the oxide layer of thermoelectric materials.Then,lead-free soldering of Bi2Te3 semiconductor material and copper sheet with solder paste was used to prepare thermoelectric devices.The power generation efficiency of thermoelectric devices was tested by using the built test device,and the image of efficiency changing with temperature difference resistance was drawn.Final-ly,the four-point method was used to test the particle resistance before and after hydrogen plasma cleaning,and it was found that the contact resistance decreased,indicating that the interface oxide content was reduced and the degree of surface defects was decreased.
Bi2Te3 thermoelectric deviceshydrogen plasma cleaninginterface optimizationcharacterization element analysis
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