Heterostructures of hetero-stack of 2D TMDs (MoS2, WS2 and ReS2) and BN

TL;DR

This paper investigates the optical emission properties of heterostructures composed of different 2D transition metal dichalcogenides (TMDs) and boron nitride (BN), revealing strong photoluminescence peaks influenced by stacking configurations.

Contribution

It introduces the study of hetero-stacked 2D TMDs with BN, highlighting the effects of stacking order on optical emission, which was not extensively explored before.

Findings

Intense PL emission peak around 2.13 eV observed.

Peak splitting depends on stacking configuration.

Transitions from BN valence band to TMD conduction bands explained.

Abstract

In this manuscript, we describe optical emission of heterostructure of hetero-stack between 2D TMDs (MoS2, WS2, and ReS2) and BN. Similar to our previous results on the stack of similar type of TMDs, intense PL emission peak is observed around 2.13 eV but is split around 2.13eV into two or more peaks depending on the different stack of TMDs with BN. The transitions from the valence band of BN to conduction bands of different TMD stacks due to quantum coupling and specific orientation explain the strong peak in the PL spectra.