Nano Research

Article Title

Indentation fracture toughness of single-crystal Bi2Te3 topological insulators


topological insulators, bismuth telluride (Bi2Te3), fracture toughness, nanoindentation


Bismuth telluride (Bi2Te3) is one of the most important commercial thermoelectric materials. In recent years, the discovery of topologically protected surface states in Bi chalcogenides has paved the way for their application in nanoelectronics. Determination of the fracture toughness plays a crucial role for the potential application of topological insulators in flexible electronics and nanoelectromechanical devices. Using depth-sensing nanoindentation tests, we investigated for the first time the fracture toughness of bulk single crystals of Bi2Te3 topological insulators, grown using the Bridgman−Stockbarger method. Our results highlight one of the possible pitfalls of the technology based on topological insulators.

Graphical Abstract


Tsinghua University Press