Exploring the Thickness-Dependence of the Properties of Layered Gallium Sulfide

Group III layered monochalcogenide gallium sulfide, GaS, is one of the latest additions to the two-dimensional (2D) materials family, and of particular interest for visible-UV optoelectronic applications due to its wide bandgap energy in the range 2.35–3.05 eV going from bulk to monolayer. Interestingly, when going to the few-layer regime, changes in the electronic structure occur, resulting in a change in the properties of the material. Therefore, a systematic study on the thickness dependence of the different properties of GaS is needed. Here, we analyze mechanically exfoliated GaS layers transferred to glass substrates. Specifically, we report the dependence of the Raman spectra, photoluminescence, optical transmittance, resistivity, and work function on the thickness of GaS. Those findings can be used as guidance in designing devices based on GaS.

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CADMIUM-DOPED Co3O4 THIN FILMS: SYNTHESIS AND CHARACTERIZATION

Surface Review and Letters ◽

10.1142/s0218625x18501342 ◽

2019 ◽

Vol 26 (01) ◽

pp. 1850134 ◽

Cited By ~ 1

Author(s):

CHERIFA DALACHE ◽

HADJ BENHEBAL ◽

BEDHIAF BENRABAH ◽

AEK AMMARI ◽

ABDELMALEK KHARROUBI ◽

...

Keyword(s):

Thin Films ◽

Impedance Spectroscopy ◽

Sol Gel ◽

Optical Transmittance ◽

Dip Coating ◽

Thin Layers ◽

Bandgap Energy ◽

Molar Ratios ◽

Glass Substrates ◽

Vis Spectroscopy

This paper contains the results of the structural and spectroscopic characterizations of undoped and Cadmium-doped cobalt oxide thin films with different Co/Cd molar ratios (3%, 5%, 7% and 9%). The nanosized undoped and cadmium-doped Co3O4 thin layers were prepared using sol–gel process and deposited on glass substrates by dip coating. The changes caused by the incorporation of cadmium at different levels of doping have been highlighted by the techniques UV–Visible (UV–Vis) spectroscopy, Infrared (IR) spectroscopy, X-ray diffraction (XRD) measurements, SEM coupled EDX and impedance spectroscopy. From the UV–Vis spectroscopy analysis, it was found that all the films are two direct bandgap energies. The optical transmittance and the bandgap energy decrease with increase in Cd concentration. The XRD spectra confirm the films were polycrystalline with a cubic spinel structure. The results of the impedance spectroscopy show that the equivalent circuit of the synthesized samples is an RC parallel circuit.

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The interaction between vacancy defects in gallium sulfide monolayer and a new vacancy defect model

Physical Chemistry Chemical Physics ◽

10.1039/d1cp01194d ◽

2021 ◽

Author(s):

JuTao Zhang ◽

Ying Liang ◽

Hao Guo ◽

Tian C Zhang ◽

Haidong Fan ◽

...

Keyword(s):

Physical Properties ◽

Electronic Properties ◽

2D Materials ◽

Vacancy Defect ◽

Sufficient Information ◽

Two Dimensional ◽

Defect Model ◽

Vacancy Defects ◽

Gallium Sulfide

Vacancy defects are inevitable when synthesizing two-dimensional (2D) materials, and vacancy defects greatly affect the physical properties, such as magnetism and electronic properties. Currently, sufficient information is not available on...

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Hydrogen-induced tunable electronic and optical properties of a two-dimensional penta-Pt2N4 monolayer

Physical Chemistry Chemical Physics ◽

10.1039/d1cp00681a ◽

2021 ◽

Author(s):

Vipin Kumar ◽

Aditya Dey ◽

Siby Thomas ◽

Mohsen Asle Zaeem ◽

Debesh R. Roy

Keyword(s):

Optical Properties ◽

2D Materials ◽

Wide Bandgap ◽

Two Dimensional ◽

Electronic And Optical Properties ◽

Two Dimensional Materials

Most of the known two-dimensional materials lack a suitable wide-bandgap, and hydrogenation can be effectively utilized to tune the bandgap of some 2D materials.

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ANNEALING EFFECT ON STRUCTURAL AND OPTICAL PROPERTIES OF COPPER-DOPED BISMUTH TRIOXIDE Cu:Bi2O3 THIN FILMS

Surface Review and Letters ◽

10.1142/s0218625x19501749 ◽

2019 ◽

Vol 27 (07) ◽

pp. 1950174

Author(s):

FATIMA ZOHRA BOUCHAREB ◽

NASR-EDDINE HAMDADOU

Keyword(s):

Thin Films ◽

Annealing Temperature ◽

Spray Pyrolysis Technique ◽

Optical Transmittance ◽

Bandgap Energy ◽

Indirect Transition ◽

Medium Temperature ◽

Glass Substrates ◽

Average Grain Size ◽

Optimum Annealing Temperature

In this work, we have examined the effect of annealing temperature on Cu-doped Bi2O3 thin films at 1%, 3% and 5% doping rate successfully prepared by spray pyrolysis technique onto glass substrates. The obtained films were subsequently annealed at different temperature for 4[Formula: see text]h. GIXRD analysis reveals the polycrystalline nature of deposited films and shows the formation of mixed [Formula: see text]- and [Formula: see text]-Bi2O3 phases. With the increase of doping rate, [Formula: see text]-phase of Bi2O3 was identified at medium temperature. The average grain size of thin films at different doping rate of Cu decreases with the increase of annealing temperature. The optical characterization shows that the optical transmittance of the films decreases with the increase of annealing temperature in the range (70–50%) and (40–10%) for 1% and 5% doping rate of Cu, respectively. The evaluation of the optical bandgap energy reveals that the indirect transition is controlling the optical response of the films. The optimum annealing temperature to reduce Bi2O3 energy bandgap to be 3.09[Formula: see text]eV, is 450∘C and 550∘C for 3% and 5% doping rate of Cu.

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Interfacial aspect of ZnTe/In2Te3 heterostructures as an efficient catalyst for the hydrogen evolution reaction

Journal of Materials Chemistry A ◽

10.1039/c9ta09687f ◽

2019 ◽

Vol 7 (48) ◽

pp. 27441-27449 ◽

Cited By ~ 11

Author(s):

Xiaoyong Yang ◽

Amitava Banerjee ◽

Zhitong Xu ◽

Ziwei Wang ◽

Rajeev Ahuja

Keyword(s):

Hydrogen Evolution ◽

Surface Properties ◽

Hydrogen Evolution Reaction ◽

2D Materials ◽

Two Dimensional ◽

Efficient Catalyst ◽

Group Iii

Two-dimensional (2D) materials, group III2–VI3 compounds have drawn intense attention due to its excellent surface properties.

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High efficient photocatalytic water splitting and large piezoelectric properties of 2D Janus group-III chalcogenides

Journal of Materials Chemistry C ◽

10.1039/d1tc00318f ◽

2021 ◽

Author(s):

Pan Wang ◽

Yixin Zong ◽

Hao Liu ◽

Hongyu Wen ◽

Hai-Bin Wu ◽

...

Keyword(s):

Water Splitting ◽

Piezoelectric Properties ◽

2D Materials ◽

Two Dimensional ◽

Photocatalytic Water Splitting ◽

Group Iii ◽

High Efficient

Recently, Janus two-dimensional (2D) materials have received considerable interest due to their intrinsic vertical dipole and hence have great potential in photocatalytic and piezoelectric applications. Here, a new series of...

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Co-planar two-dimensional Metal-Insulator-Semiconductor Capacitor: Numerical study of the device electrostatics.

10.26434/chemrxiv.5398000 ◽

2017 ◽

Author(s):

Varun Bheemireddy

Keyword(s):

Space Charge ◽

High Performance ◽

Numerical Study ◽

2D Materials ◽

Space Charge Density ◽

Two Dimensional ◽

Short Channel ◽

Metal Insulator ◽

Metal Insulator Semiconductor ◽

New Family

The two-dimensional(2D) materials are highly promising candidates to realise elegant and e cient transistor. In the present letter, we conjecture a novel co-planar metal-insulator-semiconductor(MIS) device(capacitor) completely based on lateral 2D materials architecture and perform numerical study of the capacitor with a particular emphasis on its di erences with the conventional 3D MIS electrostatics. The space-charge density features a long charge-tail extending into the bulk of the semiconductor as opposed to the rapid decay in 3D capacitor. Equivalently, total space-charge and semiconductor capacitance densities are atleast an order of magnitude more in 2D semiconductor. In contrast to the bulk capacitor, expansion of maximum depletion width in 2D semiconductor is observed with increasing doping concentration due to lower electrostatic screening. The heuristic approach of performance analysis(2D vs 3D) for digital-logic transistor suggest higher ON-OFF current ratio in the long-channel limit even without third dimension and considerable room to maximise the performance of short-channel transistor. The present results could potentially trigger the exploration of new family of co-planar at transistors that could play a signi significant role in the future low-power and/or high performance electronics.<br>

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Recent Advances and Need of Green Synthesis in Two-Dimensional Materials for Energy Conversion and Storage Applications

Current Nanoscience ◽

10.2174/1573413716999210101122503 ◽

2021 ◽

Vol 16 ◽

Author(s):

Joice Sophia Ponraj ◽

Muniraj Vignesh Narayanan ◽

Ranjith Kumar Dharman ◽

Valanarasu Santiyagu ◽

Ramalingam Gopal ◽

...

Keyword(s):

Energy Storage ◽

Green Synthesis ◽

2D Materials ◽

Synthesis Method ◽

Energy Storage And Conversion ◽

Two Dimensional ◽

Severe Problem ◽

Energy Conversion And Storage ◽

Energy Application ◽

The Impact

: Increasing energy crisis across the globe requires immediate solutions. Two-dimensional (2D) materials are in great significance because of its application in energy storage and conversion devices but the production process significantly impacts the environment thereby posing a severe problem in the field of pollution control. Green synthesis method provides an eminent way of reduction in pollutants. This article reviews the importance of green synthesis in the energy application sector. The focus of 2D materials like graphene, MoS2, VS2 in energy storage and conversion devices are emphasized based on supporting recent reports. The emerging Li-ion batteries are widely reviewed along with their promising alternatives like Zn, Na, Mg batteries and are featured in detail. The impact of green methods in the energy application field are outlined. Moreover, future outlook in the energy sector is envisioned by proposing an increase in 2D elemental materials research.

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Two-dimensional topological insulators exfoliated from Na3Bi-like Dirac semimetals

Physical Chemistry Chemical Physics ◽

10.1039/d1cp00736j ◽

2021 ◽

Author(s):

Xiaoqiu Guo ◽

Ruixin Yu ◽

Jingwen Jiang ◽

Zhuang Ma ◽

Xiuwen Zhang

Keyword(s):

Physical Properties ◽

Epitaxial Growth ◽

Topological Insulators ◽

2D Materials ◽

Van Der Waals ◽

Two Dimensional ◽

Dirac Semimetals

Topological insulation is widely predicted in two-dimensional (2D) materials realized by epitaxial growth or van der Waals (vdW) exfoliation. Such 2D topological insulators (TI’s) host many interesting physical properties such...

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Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

Journal of Materials Chemistry C ◽

10.1039/d1tc01329g ◽

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...

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