Figure 3From: Enhanced thermoelectric performance in three-dimensional superlattice of topological insulator thin filmsFigure of merit. ZT values as functions of temperature and chemical potential for Bi2Te3 2D thin films with thickness 1QL (a), 2QL (c), and 3QL (e); and the 3D superlattice with a = 1QL (b), 2QL (d) and 3QL (f). For the a = 1QL case, c = 1QL, b and d = 10 nm; for the a = 2QL case, c = 2QL, b = 7.5 nm and d = 10 nm; for the a = 3QL case, c = 3QL, b = 7.5 nm and d = 10 nm. The zero of energy is chosen to be at the center of the surface gap.Back to article page