Quintuple-layer epitaxy of high-quality Bi2Se3 thin films for topological insulator

TL;DR

This paper demonstrates the successful growth of high-quality, atomically smooth Bi2Se3 thin films on silicon substrates using molecular beam epitaxy, with detailed characterization confirming their crystallinity and stoichiometry.

Contribution

It introduces a method for epitaxial growth of single-crystalline Bi2Se3 films with controlled thickness at the atomic scale.

Findings

Films are atomically smooth and single crystalline.

Growth occurs in a self-organized quintuple-layer mode.

High-quality films can be as thin as one quintuple-layer (~1nm).

Abstract

We report the growth of atomically smooth, single crystalline Bi2Se3 thin films on Si(111) by using molecular beam epitaxy. Scanning tunneling microscopy, low-energy electron diffraction, X-ray photoelectron emission spectroscopy and Raman spectroscopy were used to characterize the stoichiometry and crystallinity of the film. The film grows in a self-organized quintuple-layer by quintuple-layer mode, and atomically smooth film can be obtained with the thickness down to one quintuple-layer (~1nm).