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Domain engineering of epitaxial (001) Bi2Te3 thin films by miscut GaAs substrate
- Source :
- Acta Materialia. 197:309-315
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Herein, we have reported domain engineering of epitaxial (001) Bi2Te3 thin films by miscut (100) substrates. On a nominal flat (100) GaAs substrate, two-variant domains that were in-plane rotated by 60°, including the 60° domain boundaries, were formed in the epitaxial Bi2Te3 film, such that the symmetry elements of two-fold rotational and/or mirror symmetries of the GaAs substrate were preserved. The domain variants were successfully reduced to obtain mono-domain Bi2Te3 thin films without any domain boundaries using the 2°-miscut GaAs substrates, where a particular step-and-terrace structure on the vicinal surface macroscopically broke the intrinsic symmetry of GaAs, lowering the number of possible domains. Depending on the miscut directions, the in-plane orientations of the mono-domain Bi2Te3 films were varied with respect to the GaAs substrate. A model was proposed to explain the effect of miscut substrate on the domain structure of Bi2Te3 thin films. Low-temperature Hall measurements revealed that in the intrinsic regime (10 K) the electron concentration of the mono-domain Bi2Te3 films (~2 × 1018 cm−3) was significantly lower than that of the two-domain films (~1019 cm−3). This was attributed to the donor-like effect of the 60° domain boundaries. These results provide an opportunity not only to integrate the single-crystalline, mono-domain, layered-chalcogenides on semiconductor single crystals, but also to manipulate their electronic transport properties by domain engineering.
- Subjects :
- 010302 applied physics
Materials science
Polymers and Plastics
business.industry
Metals and Alloys
02 engineering and technology
Substrate (electronics)
021001 nanoscience & nanotechnology
Epitaxy
01 natural sciences
Electronic, Optical and Magnetic Materials
Domain (software engineering)
Semiconductor
0103 physical sciences
Thermoelectric effect
Ceramics and Composites
Optoelectronics
Domain engineering
Thin film
0210 nano-technology
business
Vicinal
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 197
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi...........cf6790da642eb5e34d92dfe650d18d75