aspects of topological insulators (TIs), one of the ongoing challenges with these materials is
the protection of them against aging. In particular, the recent development of low-carrier-
density bulk-insulating Bi 2 Se 3 thin films and their sensitivity to air demands reliable
capping layers to stabilize their electronic properties. Here, we study the stability of the low-
carrier-density Bi 2 Se 3 thin films in air with and without various capping layers using DC …