Physical vapor transport growth and morphology of Bi2Se3 microcrystals

Abstract

High-quality Bi2Se3 microcrystals were grown by the physical vapor transport (PVT) method without using a foreign transport agent. The microplate crystals grown under the optimal temperature gradient are well faceted and have dimensions up to ∼200μm. The growth proceeds by the layer-by-layer mechanism with the formation of flat low-growth rate facets. The phase composition of the grown crystals was identified by the X-ray single crystal structure analysis in space group R3¯m, a=4.1356(3), c=28.634(5)Ǻ, Z=3 (R=0.0147). The most probable twin planes in the tetradymite structure were evaluated by the pseudo translational sublattice method.