Nanoscale characterization of bismuth telluride epitaxic layers by advanced X-ray analysis

TL;DR

This paper presents an advanced X-ray analysis method combining synchrotron radiation, dynamical diffraction simulation, and genetic algorithms to precisely characterize the nanostructure and surface properties of bismuth telluride epitaxic layers.

Contribution

It introduces a novel integrated approach for detailed structural analysis of topological insulator films at the nanoscale, including stacking, composition, and defects.

Findings

Accurate determination of layer stacking sequences and thicknesses.

Correlation between structural properties and surface morphology.

Insights into nanostructure and stacking faults in Bi2Te3 films.

Abstract

Topological insulator surface properties are strongly correlated to structural properties, requiring high-resolution techniques capable of probing both surface and bulk structures at once. In this work, high flux of synchrotron source, recursive equations for fast X-ray dynamical diffraction simulation, and genetic algorithm for data fitting are combined to reveal the detailed structure of bismuth telluride epitaxic films with thickness ranging from 8 to 168 nm. It includes stacking sequences, thickness and composition of layers in model structures, interface coherence, surface termination and morphology. These results are in agreement with the surface morphology determined by atomic force microscopy. Moreover, by using X-ray data from zero noise area detector to construct three-dimensional reciprocal space maps, insights into the nanostructure of domains and stacking faults in Bi2Te3 films are given.