Selective area growth of Bi2Te3 and Sb2Te3 topological insulator thin films
| Autor: | J. Kampmeier, Melissa Schall, Elmar Neumann, Christian Weyrich, Gregor Mussler, Detlev Grützmacher, Martin Lanius, Thomas Schäpers |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Energy-dispersive X-ray spectroscopy Nucleation Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Inorganic Chemistry Topological insulator 0103 physical sciences Materials Chemistry Optoelectronics Charge carrier Reactive-ion etching Thin film 010306 general physics 0210 nano-technology business Surface states Molecular beam epitaxy |
| Zdroj: | Journal of Crystal Growth. 443:38-42 |
| ISSN: | 0022-0248 |
| Popis: | The intrinsic bulk behavior of topological insulators (TI) is a key issue for their employment in future device applications. State of the art TIs predominantly suffer from large bulk charge carrier concentrations that mask their extraordinary surface states. In this paper we present the selective area growth of Bi 2 Te 3 and Sb 2 Te 3 TI thin films on prestructured Si(111) Si on insulator (SOI) substrates, paving the way to high quality TI nanostructures in which access to surface states is enhanced. Therefore high quality Bi 2 Te 3 and Sb 2 Te 3 thin films were deposited by means of solid source molecular beam epitaxy (MBE) and subsequently investigated by energy dispersive x-ray spectroscopy (EDX). To investigate the transport properties of the selectively grown thin films, magnetotransport measurements were performed at low temperatures. Nucleation in the SiO 2 valleys next to the prepatterned Si(111) mesa structures was not observed. The structural and morphological qualities of crystals deposited on untreated Si(111) SOI wafers are completely preserved by employing the selective area growth on prepatterned substrates. The transport characteristics of the selectively-grown TI systems are comparable to those of the analogous postpatterned films. |
| Databáze: | OpenAIRE |
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