Research On The Measurement Of Thermoelectric Materials’ Thermal Performance

Thermoelectric materials can realize direct conversion of electric power and heat energy which may widely used in the future. Seebeck coefficient and thermal conductivity are two key factors for the performance evaluation of thermoelectric materials. Accurate measurement of thermal properties of thermoelectric materials has a guiding effect on future investigation. However, there are big differences between the measurement of micro or nano scale materials with bulk materials. The former has more restrictions in terms of scale and dimension, which usually requires complicated methods to set up micro measuring electrode that leads to hard measuring, so It is significant to set up a thermoelectric material performance measurement system for future investigation.The current business equipment we use for the measurement of thermal performance of micro-nano scale materials mainly rely on import equipment. Bi2Se3 is a kind of commercial thermoelectric materials. In this thesis we used the chemical vapor deposition(CVD) method to fabricate Bi2Se3 nanowires, set up the thermoelectric materials measure system, measured Seebeck coefficients of Bi2Se3 film and microscale Bi2Se3 slice. The result shows that the Seebeck coefficient increases as temperature increases for Bi2Se3 film and the Seebeck coefficient of microscale Bi2Se3 slice at 307K is-79μV/K. We also used the 3ω method to measure the thermal conductivity of bulk quartz for verification. The result shows that the thermal conductivity of bulk quartz at 307K is 1.48W/m/K.