The structural, electronic and optical properties of four α-Se-based heterostructures with hyperbolic characteristics

Abstract

The physical properties and potential applications of two-dimensional (2D) materials can be effectively modulated and enriched by constructing van der Waals heterostructures (VDWHs) with two or more 2D monolayer materials....

Interface‐Dependent Electronic Structure and Optical Properties of Staggered Al2STe/Ga2STe van der Waals Heterostructures

“…[ 41 ] Zhao et al reported that the optical absorption of the four α‐Se‐based vdWHs in the visible and ultraviolet light regions is significantly enhanced compared with the individual layers. [ 42 ] Generally, there are three different band alignments of vdWHs, which are straddling (type‐I), staggered (type‐II), and broken (type‐III). [ 43 ] In staggered band alignment vdWHs, electrons and holes are confined to different monolayers, leading to greater spatial separation than intralayer excitons, facilitating the formation of interlayer excitons and further extending their lifetimes.…”