Temperature and Thickness Dependences of Thermoelectric Properties of PbS/EuS Bilayers

摘要

A non-monotonic character of the dependences of the thermoelectric properties of PbS/EuS/(001)KCl heterostructures on the PbS layer thickness d(d = 2 ― 200 nm) was detected. Pronounced extrema at d ～ 15 nm and less distinct extrema at d ～ 30 nm and d ～ 100 nm were observed. It is suggested that the complex character of the dependences is caused by the competition between percolation phenomena and size quantization. The critical exponent for the electrical conductivity (t= 1.6 +- 0.15) is determined.