Thermoelectric power generation is based on seebeck effect that was discovered in 1821. From the temperature difference of hot and cold side, we can harvest the electrical energy. To enhance the efficiency of thermoelectric generator, there are two key factors, which is temperature difference (ΔT) and dimensionless figure of merit (ZT). Temperature difference ΔT is system factor of thermoelectric generator that drives the charge carriers from hot side to cold side. Dimensionless figure of merit (ZT) is materials’s intrinsic properties that consists of three parameters (electrical conductivity, seebeck coefficient, thermal conductivity)