Twisted MoSe2 Homobilayer Behaving as a Heterobilayer
arXiv:2404.15542 · doi:10.1021/acs.nanolett.4c01764
Abstract
Heterostructures (HSs) formed by the transition-metal dichalcogenides (TMDCs) materials have shown great promise in next-generation optoelectronic and photonic applications. An artificially twisted HS, allows us to manipulate the optical, and electronic properties. With this work, we introduce the understanding of the complex energy transfer (ET) process governed by the dipolar interaction in a twisted molybdenum diselenide (MoSe2) homobilayer without any charge-blocking interlayer. We fabricated an unconventional homobilayer (i.e., HS) with a large twist angle by combining the chemical vapor deposition (CVD) and mechanical exfoliation (Exf.) techniques to fully exploit the lattice parameters mismatch and indirect/direct (CVD/Exf.) bandgap nature. This effectively weaken the charge transfer (CT) process and allows the ET process to take over the carrier recombination channels. We utilize a series of optical and electron spectroscopy techniques complementing by the density functional theory calculations, to describe a massive photoluminescence enhancement from the HS area due to an efficient ET process. Our results show that the electronically decoupled MoSe2 homobilayer is coupled by the ET process, mimicking a 'true' heterobilayer nature.
arXiv comment4 figures
References in corpus (26)
- Van der Waals heterostructures
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- Measurement of the Optical Conductivity of Graphene
- Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
- Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
- Ultraflat bands and shear solitons in Moiré patterns of twisted bilayer transition metal dichalcogenides
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Carrier and polarization dynamics in monolayer MoS2
- Anomalous Interlayer Exciton Diffusion in Twist-Angle-Dependent Moiré Potentials of WS-WSe Heterobilayers
- Valley depolarization due to inter- and intra-valley electron-hole exchange interactions in monolayer MoS
- Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2
- Directly visualizing the momentum forbidden dark excitons and their dynamics in atomically thin semiconductors
- Evidence for Fast Interlayer Energy Transfer in MoSe2/WS2 Heterostructures
- Interfacial Charge Transfer Circumventing Momentum Mismatch at 2D van der Waals Heterojunctions
- Exciton band structure in layered MoSe2: from a monolayer to the bulk limit
- Filtering the photoluminescence spectra of atomically thin semiconductors with graphene
- Electronic structures, charge transfer and charge orders in twisted transition metal dichalcogenide bilayers
- Direct measurement of key exciton properties: energy, dynamics and spatial distribution of the wave function
- Ultrafast charge-transfer dynamics in twisted MoS/WSe heterostructures
- Dominating Interlayer Resonant Energy Transfer in Type-II 2D Heterostructure
- Probing correlations in the exciton landscape of a moiré heterostructure
- Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
- The optical response of artificially twisted MoS bilayers
- Impact of indirect transitions on valley polarization in WS and WSe
- Excitation-Dependent High-Lying Excitonic Exchange via Interlayer Energy Transfer from Lower-to-Higher Bandgap 2D Material
- Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides