Domain engineering of epitaxial (001) Bi2Te3 thin films by miscut GaAs substrate
| Autor: | Jinsang Kim, Seong Keun Kim, Kwang-Chon Kim, Seung Hyub Baek |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
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 |
| Zdroj: | Acta Materialia. 197:309-315 |
| ISSN: | 1359-6454 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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