Probing nano-heterogeneity and aging effects in lateral 2D heterostructures using tip-enhanced photoluminescence

Sahoo, Prasana; Zong, Haonan; Liu, Jiru; Xue, Wenjin; Lai, Xiaoyi; Gutiérrez, Humberto; Voronine, Dmitri V.

doi:10.1364/ome.9.001620

Cited by 39 publications

(40 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The limiting resolution is~20 nm, mainly defined by the tip diameter 26 . It has been used in the past to investigate the TEPL signal as a function of the number of layers as well as mapping of local strain, heterogeneity of emission and charged emission in transition metal dichalcogenides (TMDCs) [27][28][29][30] . The techniques' ability to resolve the nanoscale optical emission properties has enabled experimental distinction of edge and basal plane "bulk" regions, aiding in the identification of 1D to 2D quantum confinement effect in TMDCs.…”

Section: Introductionmentioning

confidence: 99%

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Moore

Nguyen

et al. 2020

npj 2D Mater Appl

View full text Add to dashboard Cite

Developing characterization strategies to better understand nanoscale features in two-dimensional nanomaterials is of crucial importance, as the properties of these materials are many times driven by nanoscale and microscale chemical and structural modifications within the material. For the case of large area monolayer MoSe2 flakes, kelvin probe force microscopy coupled with tip-enhanced photoluminescence was utilized to evaluate such features including internal grain boundaries, edge effects, bilayer contributions, and effects of oxidation/aging, many of which are invisible to topographical mapping. A reduction in surface potential due to n-type behavior was observed at the edge of the flakes as well as near grain boundaries. Potential phase mapping, which corresponds to the local dielectric constant, depicted local biexciton and trion states in optically-active regions of interest such as grain boundaries. Finally, nanoscale surface potential and photoluminescence mapping was performed at several stages of oxidation, revealing that various oxidative states can be evaluated during the aging process. Importantly, all of the characterization performed in this study was non-destructive and rapid, crucial for quality evaluation of an exciting class of two-dimensional nanomaterials.

show abstract

Section: Introductionmentioning

confidence: 99%

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Moore

Nguyen

et al. 2020

npj 2D Mater Appl

View full text Add to dashboard Cite

show abstract

“…7,8,[13][14][15]21,24,25 Oxidation preferentially begins at defects such as chalcogen vacancies and grain boundaries, can be accelerated by illumination, and may be facilitated by organic absorbates. 7,9,[14][15][16]24,26 The effects of humidity on oxidation have also been studied. 17−20 For instance, the oxidation rate of pulverized MoS 2 at elevated temperature has been found to depend on relative humidity and particle size.…”

mentioning

confidence: 99%

Growth Kinetics and Atomistic Mechanisms of Native Oxidation of ZrS_xSe_2–x and MoS₂ Crystals

Singh

Yang

et al. 2020

Nano Lett.

View full text Add to dashboard Cite

A thorough understanding of native oxides is essential for designing semiconductor devices. Here, we report a study of the rate and mechanisms of spontaneous oxidation of bulk single crystals of ZrS x Se 2−x alloys and MoS 2 . ZrS x Se 2−x alloys oxidize rapidly, and the oxidation rate increases with Se content. Oxidation of basal surfaces is initiated by favorable O 2 adsorption and proceeds by a mechanism of Zr−O bond switching, that collapses the van der Waals gaps, and is facilitated by progressive redox transitions of the chalcogen. The rate-limiting process is the formation and out-diffusion of SO 2 . In contrast, MoS 2 basal surfaces are stable due to unfavorable oxygen adsorption. Our results provide insight and quantitative guidance for designing and processing semiconductor devices based on ZrS x Se 2−x and MoS 2 and identify the atomistic-scale mechanisms of bonding and phase transformations in layered materials with competing anions.

show abstract

“…Using TEPL profile, the junction width was estimated as ∼150 nm, which is on the subwavelength scale. 201,217,221 TEPL analysis has also provided evidence of directional hot-electron injection from WSe 2 to MoSe 2 by potential gradient at the junction, which results in enhancement of the luminescence in MoSe 2 regions. Another big advantage of using a plasmonic metal tip is a correlation with nondestructive electrical measurements such as potential, capacitance, and electric and photoconductive measurement.…”

Section: Near-field Spectroscopy Study On 2d Materialsmentioning

confidence: 98%

Exciton–Photonics: From Fundamental Science to Applications

Anantharaman

Jariwala

2021

ACS Nano

View full text Add to dashboard Cite

Semiconductors in all dimensionalities ranging from 0D quantum dots and molecules to 3D bulk crystals support bound electron-hole pair quasiparticles termed as excitons. Over the past two decades, the emergence of a variety of low-dimensional semiconductors that support excitons combined with advances in nano-optics and photonics has burgeoned a new area of research that focuses on engineering, imaging, and modulating coupling between excitons and photons, resulting in the formation of hybrid-quasiparticles termed exciton-polaritons. This new area has the potential to bring about a paradigm shift in quantum optics, as well as classical optoelectronic devices. Here, we present a review on the coupling of light in excitonic semiconductors and investigation of the unique properties of these hybrid quasiparticles via both farfield and near-field imaging and spectroscopy techniques. Special emphasis is laid on recent advances with critical evaluation of the bottlenecks that plague various materials towards practical device implementations including quantum light sources.Our review highlights a growing need for excitonic materials development together with optical engineering and imaging techniques to harness the utility of excitons and their host materials for a variety of applications.

show abstract

Probing nano-heterogeneity and aging effects in lateral 2D heterostructures using tip-enhanced photoluminescence

Cited by 39 publications

References 60 publications

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Growth Kinetics and Atomistic Mechanisms of Native Oxidation of ZrS_xSe_2–x and MoS₂ Crystals

Exciton–Photonics: From Fundamental Science to Applications

Contact Info

Product

Resources

About

Probing nano-heterogeneity and aging effects in lateral 2D heterostructures using tip-enhanced photoluminescence

Cited by 39 publications

References 60 publications

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Uncovering topographically hidden features in 2D MoSe2 with correlated potential and optical nanoprobes

Growth Kinetics and Atomistic Mechanisms of Native Oxidation of ZrSxSe2–x and MoS2 Crystals

Exciton–Photonics: From Fundamental Science to Applications

Contact Info

Product

Resources

About

Growth Kinetics and Atomistic Mechanisms of Native Oxidation of ZrS_xSe_2–x and MoS₂ Crystals