Fig. 4
From: Double thermoelectric power factor of a 2D electron system
Two-dimensionality of 2DES: a key to enhance thermopower. a Plots of thermopower of the 2DESs, [N uc SrTi1 − xNb x O3|11 uc SrTiO3]10 superlattices (x = 0.2, 0.3, and 0.8), versus the carrier concentration (n). Compared to bulk values (gray squares), all the 2DESs show an enhanced −S as N is reduced under 3 uc. b Enhancement factors in –S (S2DES/SBulk) for three sets of 2DESs. For x = 0.2 and 0.3 2DESs, the highest S2DES/SBulk values are obtained at N = 1, which are 4 and 5, respectively, while that of x = 0.8 can reach 10
