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We report on "graphene-like" mechanical exfoliation of single-crystal Bi2Te3films and thermoelectric characterization of the stacks of such films. Thermalconductivity of the resulting "pseudo-superlattices" was measured by the "hotdisk" and "laser flash" techniques. The room-temperature in-plane (cross-plane)thermal conductivity of the stacks decreases by a factor of ~2.4 (3.5) ascompared to bulk. The thermal conductivity reduction with preserved electricalproperties leads to strong increase in the thermoelectric figure of merit. Itis suggested that the film thinning to few-quintuples and tuning of the Fermilevel can help in achieving the topological-insulator surface transport regimewith an extraordinary thermoelectric efficiency.

Mechanically-Exfoliated Stacks of Thin Films of Bismuth Telluride Topological Insulators with Enhanced Thermoelectric Performance