Determination of ZT of PN thermoelectric couples by AC electrical measurement

摘要: In this work we use the thermoelectric coupling between Peltier and Seebeck effects to determine ZT of a bismuth telluride couple. This acts as thermal induction produces voltage drop induced by gradient in addition resistive voltage. sine wave current excitation, relative contribution these two terms depends on electrical properties materials well frequency. The lock-in amplifier allows separate at frequency from Joule one twice We have developed original models simulate electro-thermal behavior first is based quadrupole an analytical resolution. second uses simulator SPICE. order control ambient temperature boundary conditions, designed specific sample holder for such kind measurement. An optimization procedure identification conductivity power. From can with good accuracy couple simple measurement, method suitable many kinds samples.