Inversion symmetry broken in 2H phase vanadium-doped molybdenum disulfide

Nanoscale ◽  
2021 ◽  
Author(s):  
Hanjun Jiang ◽  
Lu Zheng ◽  
Jing Wang ◽  
Manzhang Xu ◽  
Xuetao Gan ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Inversion Symmetry ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Shg Efficiency ◽  
Optical Applications ◽  
Layered Transition Metal ◽  
Nonlinear Optical Applications

Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have received much attention in nonlinear optical applications due to their unique crystal structures and second harmonic generation (SHG) efficiency. However, SHG signals...

Investigation of Transition Metal-Xanthate Complexes for Nonlinear Optical Applications

1998 ◽  
Vol 519 ◽  
Author(s):  
David E. Zelmon ◽  
Zewdu Gebeyehu ◽  
David Tomlin ◽  
Thomas M. Cooper
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Frequency Doubling ◽  
Harmonic Signal ◽  
Metal Salts ◽  
Potassium Salts ◽  
Metal Xanthate ◽  
Optical Applications ◽  
Nonlinear Optical Applications ◽  
Second Harmonic Signal

AbstractWe have synthesized several metal xanthate complexes from metal salts and xanthate potassium salts. Powders of several of the materials were sorted and tested for their nonlinear optical properties. Cadmium xanthate demonstrated phase matchability for frequency doubling of 1.06 micron light and generated a very strong second harmonic signal.

Phonon Coupling and Dielectric Response in 2D Semiconductor

NANO ◽  
2021 ◽  
Author(s):  
Arslan Usman ◽  
Abdul Sattar ◽  
Hamid Latif ◽  
Muhammad Imran
Keyword(s):  
Transition Metal Dichalcogenides ◽  
Coupling Mechanism ◽  
Two Dimensional ◽  
Electron Hole ◽  
Exciton Coupling ◽  
Gain Energy ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal ◽  
The Impact

The impact of phonon and their surrounding environment on exciton and its complexes were investigated in monolayer WSe2 semiconductor. Phonon up-conversion has been studied in past for conventional III–V semiconductors, but its role in two-dimensional layered transition metal dichalcogenides has rarely been explored. We investigated the photoluminescence up-conversion mechanism in WSe2 monolayer and found that a lower energy photon gain energy upto 64[Formula: see text]meV to be up-converted to emission photon at room temperature. Moreover, the phonon-exciton coupling mechanism has also been investigated and the role of dielectric screening has been explored to get complete insight of coulomb’s interaction in these electron-hole pairs. Investigations of charge carrier’s lifetime reveal that boron nitride encapsulated monolayer has shorter recombination time as low as 41 ps as compared to a bare monolayer on SiO2 substrate. These results are very promising for realizing spintronics-based application from two-dimensional layered semiconductors.

Controllable growth of multilayered XSe2 (X=W and Mo) for nonlinear optical and optoelectronic applications

2D Materials ◽  
2021 ◽  
Author(s):  
Kun Ye ◽  
Lixuan Liu ◽  
Liying Chen ◽  
Wenlong Li ◽  
Bochong Wang ◽  
...  
Keyword(s):  
Large Scale ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Chemical Vapor ◽  
Fast Response ◽  
Peak Position ◽  
Metal Dichalcogenides ◽  
Controllable Growth ◽  
Optoelectronic Applications ◽  
Layered Transition Metal

Abstract The layered transition metal dichalcogenides (TMDs) exhibit the intriguing physical properties and potential application in novel electronic devices. However, controllable growth of multilayer TMDs remains challenging. Herein, large-scale and high-quality multilayer prototype TMDs of W(Mo)Se2 were synthesized via chemical vapor deposition. For Raman and PL measurements, 2H and 3R multilayer WSe2 crystals displayed significant layer-dependent peak position and intensity feature. Besides, different from the oscillatory relationship of SHG intensity for odd-even layer numbers in 2H-stacked multilayer WSe2, the second harmonic generation intensity of 3R-stacked ones parabolically increased with the thickness due to the absence of inversion symmetry. For device application, photodetectors based on WSe2 with increasing thickness exhibited p-type (bilayer), ambipolar (trilayer), and n-type (4 layers) semiconductor behaviors, respectively. Furthermore, photodetectors based on the as-synthesized 3R-stacked WSe2 flakes displayed an excellent responsivity (R) of 7.8×103 mA/W, high specific detectivity (Da*) of 1.7×1014 Jones, outstanding external quantum efficiency (EQE) of 8.6×102 %, and fast response time (τRise=57 ms and τFall=53 ms) under 532 nm illumination with bias voltage of Vds=5 V. Similar results have also been achieved in multilayer MoSe2 crystals. All these findings indicate great potential of 3R-stacked TMDs in two-dimensional optoelectronic applications.

A thorough understanding of the nonlinear optical properties of BODIPY/carborane/diketopyrrolopyrrole hybrid chromophores: module contribution, linear combination, one-/two-dimensional difference and carborane's arrangement

2019 ◽  
Vol 7 (25) ◽  
pp. 7531-7547 ◽  
Author(s):  
Hong-Qiang Wang ◽  
Jin-Ting Ye ◽  
Yuan Zhang ◽  
Yuan-Yuan Zhao ◽  
Yong-Qing Qiu
Keyword(s):  
Optical Properties ◽  
Linear Combination ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Two Dimensional ◽  
Optical Applications ◽  
Nonlinear Optical Applications

The high modularity of multicomponent photoactive BODIPY/carborane/diketopyrrolopyrrole hybrid chromophores was explored for linear/nonlinear optical applications.

First-principles investigations of vanadium disulfide for lithium and sodium ion battery applications

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 54874-54879 ◽  
Author(s):  
Wenhui Wang ◽  
Zhongti Sun ◽  
Wenshuai Zhang ◽  
Quanping Fan ◽  
Qi Sun ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Transition Metal Dichalcogenides ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Two Dimensional ◽  
Scientific Interest ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

Recently, two-dimensional (2D) layered transition metal dichalcogenides (LTMDs) have attracted great scientific interest for ion battery applications.

Nonlinear Optical Interactions and Relaxation in 2D Layered Transition Metal Dichalcogenides Probed by Optical and Photoacoustic Z-Scan Methods

ACS Photonics ◽  
2020 ◽  
Vol 7 (12) ◽  
pp. 3440-3447
Author(s):  
Melissa E. Maldonado ◽  
Avishek Das ◽  
Ali M. Jawaid ◽  
Allyson J. Ritter ◽  
Richard A. Vaia ◽  
...  
Keyword(s):  
Transition Metal ◽  
Nonlinear Optical ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal
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