Large-Area and Transferred High-Quality Three-Dimensional Topological Insulator Bi2-xSbxTe3-ySey Ultrathin Film by Catalyst-Free Physical Vapor Deposition

Abstract

Uniform and large area synthesis of bulk insulating ultrathin films is an important subject toward applications of a surface of three dimensional topological insulators (3D-TIs) in various electronic devices. Here we report epitaxial growth of bulk insulating three dimensional topological insulator (3D-TI) Bi2-xSbxTe3-ySey (BSTS) ultrathin films, ranging from a few quintuple to several hundreds of layaers, on mica in a large-area (1 cm2) via catalyst free physical vapor deposition. These films can nondestructively be exfoliated using deionized water and transferred to various kinds of substrates as desired. The transferred BSTS thin films show good ambipolar characteristics as well as well defined quantum oscillations arising from the topological surface states. Carrier mobility of 2500-5100 cm2(Vs)-1 is comparable to the high quality bulk BSTS single crystal. Moreover, tunable electronic states from the massless to the massive Dirac fermion were observed with a decrease in the film thickness. Both the feasible large area synthesis and the reliable film transfer process can promise that BSTS ultrathin films will pave a route to many applications of 3D-TIs.

arXiv comment18 page, 4 figures

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• In-plane Topological p-n Junction in the Three-Dimensional Topological Insulator Bi${}_{2-x}$Sb${}_x$Te${}_{3-y}$Se${}_y$
• Alloy engineering of topological semimetal phase transition in MgTa${}_{2-x}$Nb${}_x$N${}_3$
• Novel synthesis of topological insulator based nanostructures (Bi2Te3) demonstrating high performance photodetection
• Linear magnetoresistance and surface to bulk coupling in topological insulator thin films
• Thermoelectric properties of 3D topological insulator: Direct observation of topological surface and its gap opened states
• Simple mechanisms that impede the Berry phase identification from magneto-oscillations
• Electrical detection of spin-polarized current in topological insulator Bi1.5Sb0.5Te1.7Se1.3
• Versatile Large-Area Custom-Feature van der Waals Epitaxy of Topological Insulators
• Ultrathin film of 3D topological insulators by vapor-phase epitaxy: Surface dominant transport in wide temperature revealed by Seebeck measurement