Abstract
Abstract We report the synthesis of multiple Bi2Te3 shells on multi-stepped Sb2Te3 nanoplates using molecular beam epitaxial (MBE) step-edge growth. For the growth of Bi2Te3/Sb2Te3 hetero-structures, multi-stepped Sb2Te3 nanoplates with stair-like morphology following layer-by-layer (LBL) growth mode were obtained by optimizing the growth temperature, and the growth of Bi2Te3 on the step-edges of the Sb2Te3 nanoplates was followed. Width of Bi2Te3 on the Sb2Te3 nanoplates was controlled by changing the growth time. Structural properties of the hetero-structures were investigated using aberration-corrected (Cs-corrected) high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), revealing the interface between Sb2Te3 and Bi2Te3. In-plane epitaxial relation at the interface was confirmed using fast Fourier transforms (FFTs). Compositional analysis of Bi2Te3 and Sb2Te3 was verified through energy-dispersive X-ray spectroscopy. Furthermore, we performed density functional theory (DFT) calculations to confirm the preferential growth of Bi2Te3 on the step-edges of Sb2Te3. By forming multi-stepped core structure, it would be feasible to create various integrated hetero-structures.
Published Version
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