Strong Photon Absorption in 2-D Material-Based Spiral Photovoltaic Cells

MRS Advances ◽  
2016 ◽  
Vol 1 (59) ◽  
pp. 3915-3921 ◽  
Author(s):  
Mohammad Hossein Tahersima ◽  
Volker J. Sorger
Keyword(s):  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Incident Light ◽  
Photovoltaic Cells ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Strong Light ◽  
Metal Dichalcogenides ◽  
Absorbing Material ◽  
Light Matter Interaction

ABSTRACTAtomically thin transition-metal dichalcogenides (TMD) hold promise for making ultrathin-film photovoltaic devices with a combination of excellent photo-absorption and mechanical flexibility. However, reported absorption for photovoltaic cells based on TMD materials is still just a few percent of the incident light due to their sub-wavelength thickness leading to low cell efficiencies. Here we discuss that taking advantage of the mechanical flexibility of two dimensional (2D) materials by rolling their Van der Waal heterostructures such as molybdenum disulfide (MoS2)/graphene (Gr)/hexagonal boron nitride (hBN) to a spiral solar cell, leads to strong light matter interaction allowing for solar absorptions up to 90%. The optical absorption of a 1 µm-long hetero-material spiral cell consisting of the aforementioned hetero stacks is about 50% stronger compared to a planar MoS2 cell of the same thickness; although the volumetric absorbing material ratio is only 6%. We anticipate these results to provide guidance for photonic structures that take advantage of the unique properties of 2D materials in solar energy conversion applications.

scholarly journals Frontiers in Optics Washington Sept 2019 BiOBr JTu4A.37

2020 ◽  
Author(s):  
David Moss
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
Metal Dichalcogenides

We observe extremely high two photon absorption (TPA) of BiOBr nanoflakes using the Z-scan technique. We report a TPA coefficient as high as ~ 6.697 × 10-7 m/W – more than an order of magnitude larger than that of other 2D materials such as graphene and transition metal dichalcogenides.

scholarly journals Non-Carbon 2D Materials-Based Field-Effect Transistor Biosensors: Recent Advances, Challenges, and Future Perspectives

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4811 ◽  
Author(s):  
Mohammed Sedki ◽  
Ying Chen ◽  
Ashok Mulchandani
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Recent Advances ◽  
Metal Dichalcogenides ◽  
Biosensor Applications

In recent years, field-effect transistors (FETs) have been very promising for biosensor applications due to their high sensitivity, real-time applicability, scalability, and prospect of integrating measurement system on a chip. Non-carbon 2D materials, such as transition metal dichalcogenides (TMDCs), hexagonal boron nitride (h-BN), black phosphorus (BP), and metal oxides, are a group of new materials that have a huge potential in FET biosensor applications. In this work, we review the recent advances and remarkable studies of non-carbon 2D materials, in terms of their structures, preparations, properties and FET biosensor applications. We will also discuss the challenges facing non-carbon 2D materials-FET biosensors and their future perspectives.

scholarly journals Nonlocal dielectric function and nested dark excitons in MoS2

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Andreas Koitzsch ◽  
Anna-Sophie Pawlik ◽  
Carsten Habenicht ◽  
Tom Klaproth ◽  
Roman Schuster ◽  
...  
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Dielectric Function ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Particle Model ◽  
Momentum Dependence ◽  
Strong Light ◽  
Local Maxima ◽  
Metal Dichalcogenides

Abstract Their exceptional optical properties are a driving force for the persistent interest in atomically thin transition metal dichalcogenides such as MoS2. The optical response is dominated by excitons. Apart from the bright excitons, which directly couple to light, it has been realized that dark excitons, where photon absorption or emission is inhibited by the spin state or momentum mismatch, are decisive for many optical properties. However, in particular the momentum dependence is difficult to assess experimentally and often remains elusive or is investigated by indirect means. Here we study the momentum dependent electronic structure experimentally and theoretically. We use angle-resolved photoemission as a one-particle probe of the occupied valence band structure and electron energy loss spectroscopy as a two-particle probe of electronic transitions across the gap to benchmark a single-particle model of the dielectric function $$\epsilon ({\bf{q}},\omega )$$ ϵ ( q , ω ) against momentum dependent experimental measurements. This ansatz captures key aspects of the data surprisingly well. In particular, the energy region where substantial nesting occurs, which is at the origin of the strong light–matter interaction of thin transition metal dichalcogenides and crucial for the prominent C-exciton, is described well and spans a more complex exciton landscape than previously anticipated. Its local maxima in $$({\bf{q}}\ \ne \ 0,\omega )$$ ( q ≠ 0 , ω ) space can be considered as dark excitons and might be relevant for higher order optical processes. Our study may lead to a more complete understanding of the optical properties of atomically thin transition metal dichalcogenides.

scholarly journals Recent Advances on 2D Materials towards 3D Printing

Chemistry ◽  
2021 ◽  
Vol 3 (4) ◽  
pp. 1314-1346
Author(s):  
I. Jénnifer Gómez ◽  
Nuria Alegret ◽  
Antonio Dominguez-Alfaro ◽  
Manuel Vázquez Vázquez Sulleiro
Keyword(s):  
3D Printing ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Low Cost ◽  
Inorganic Compounds ◽  
Transition Metal Dichalcogenides ◽  
Recent Advances ◽  
Metal Dichalcogenides ◽  
3D Printers ◽  
Printed Materials

In recent years, 2D materials have been implemented in several applications due to their unique and unprecedented properties. Several examples can be named, from the very first, graphene, to transition-metal dichalcogenides (TMDs, e.g., MoS2), two-dimensional inorganic compounds (MXenes), hexagonal boron nitride (h-BN), or black phosphorus (BP). On the other hand, the accessible and low-cost 3D printers and design software converted the 3D printing methods into affordable fabrication tools worldwide. The implementation of this technique for the preparation of new composites based on 2D materials provides an excellent platform for next-generation technologies. This review focuses on the recent advances of 3D printing of the 2D materials family and its applications; the newly created printed materials demonstrated significant advances in sensors, biomedical, and electrical applications.

scholarly journals Memristors Based on 2D Monolayer Materials

2021 ◽  
Author(s):  
Xiaohan Wu ◽  
Ruijing Ge ◽  
Deji Akinwande ◽  
Jack C. Lee
Keyword(s):  
Metal Ion ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Random Access ◽  
Switching Behavior ◽  
Mechanical And Thermal Properties ◽  
Rf Switch ◽  
Non Volatile Memory ◽  
Metal Dichalcogenides

2D materials have been widely used in various applications due to their remarkable and distinct electronic, optical, mechanical and thermal properties. Memristive effect has been found in several 2D systems. This chapter focuses on the memristors based on 2D materials, e. g. monolayer transition metal dichalcogenides (TMDs) and hexagonal boron nitride (h-BN), as the active layer in vertical MIM (metal–insulator–metal) configuration. Resistive switching behavior under normal DC and pulse waveforms, and current-sweep and constant stress testing methods have been investigated. Unlike the filament model in conventional bulk oxide-based memristors, a new switching mechanism has been proposed with the assistance of metal ion diffusion, featuring conductive-point random access memory (CPRAM) characteristics. The use of 2D material devices in applications such as flexible non-volatile memory (NVM) and emerging zero-power radio frequency (RF) switch will be discussed.

scholarly journals Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

2021 ◽  
Vol 3 (1) ◽  
pp. 272-278
Author(s):  
Pilar G. Vianna ◽  
Aline dos S. Almeida ◽  
Rodrigo M. Gerosa ◽  
Dario A. Bahamon ◽  
Christiano J. S. de Matos
Keyword(s):  
Dielectric Constant ◽  
Transition Metal ◽  
Harmonic Generation ◽  
Nonlinear Effect ◽  
Second Harmonic ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Metal Dichalcogenides ◽  
Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

2021 ◽  
Author(s):  
Sai Manoj Gali ◽  
David Beljonne
Keyword(s):  
Transition Metal ◽  
Charge Transport ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides

Transition Metal Dichalcogenides (TMDCs) are emerging as promising two-dimensional (2D) materials. Yet, TMDCs are prone to inherent defects such as chalcogen vacancies, which are detrimental to charge transport. Passivation of...

scholarly journals Additive-Enhanced Exfoliation for High-Yield 2D Materials Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 601
Author(s):  
Dinh-Tuan Nguyen ◽  
Hsiang-An Ting ◽  
Yen-Hsun Su ◽  
Mario Hofmann ◽  
Ya-Ping Hsieh
Keyword(s):  
Large Scale ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Spectroscopic Characterization ◽  
High Yield ◽  
Nanometer Scale ◽  
Efficient Production ◽  
Device Performance ◽  
Metal Dichalcogenides ◽  
Scale Deposition

The success of van-der-Waals electronics, which combine large-scale-deposition capabilities with high device performance, relies on the efficient production of suitable 2D materials. Shear exfoliation of 2D materials’ flakes from bulk sources can generate 2D materials with low amounts of defects, but the production yield has been limited below industry requirements. Here, we introduce additive-assisted exfoliation (AAE) as an approach to significantly increase the efficiency of shear exfoliation and produce an exfoliation yield of 30%. By introducing micrometer-sized particles that do not exfoliate, the gap between rotor and stator was dynamically reduced to increase the achievable shear rate. This enhancement was applied to WS2 and MoS2 production, which represent two of the most promising 2D transition-metal dichalcogenides. Spectroscopic characterization and cascade centrifugation reveal a consistent and significant increase in 2D material concentrations across all thickness ranges. Thus, the produced WS2 films exhibit high thickness uniformity in the nanometer-scale and can open up new routes for 2D materials production towards future applications.

scholarly journals Synthesis and characterisation of thin-film platinum disulfide and platinum sulfide

Nanoscale ◽  
2021 ◽  
Author(s):  
Conor Patrick Cullen ◽  
Cormac Ó Coileáin ◽  
John B McManus ◽  
Oliver Hartwig ◽  
David McCloskey ◽  
...  
Keyword(s):  
Thin Film ◽  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides ◽  
Group 10

Group-10 transition metal dichalcogenides (TMDs) are rising in prominence within the highly innovative field of 2D materials. While PtS2 has been investigated for potential electronic applications, due to its high...

scholarly journals 2D Materials: Re Doping in 2D Transition Metal Dichalcogenides as a New Route to Tailor Structural Phases and Induced Magnetism (Adv. Mater. 43/2017)

2017 ◽  
Vol 29 (43) ◽  
Author(s):  
Vidya Kochat ◽  
Amey Apte ◽  
Jordan A. Hachtel ◽  
Hiroyuki Kumazoe ◽  
Aravind Krishnamoorthy ◽  
...  
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides
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