Elevated Refractive Index of MoS2 Amorphous Nanoparticles with a Reduced Band Gap Applicable for Optoelectronics

Shreya, None; Phogat, Peeyush; Jha, Ranjana; Singh, Sukhvir

doi:10.1007/978-981-99-2349-6_39

Cited by 19 publications

(3 citation statements)

References 16 publications

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“…Here, P refers to the primitive lattice, 63 denotes a sixfold rotational symmetry axis and mmc indicates mirror planes, or reflection symmetry, in three mutually perpendicular directions. The sample exhibited hexagonal crystal system for which the relation of lattice parameters 𝑎𝑎 and 𝑐𝑐 are given as [6],…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Previous studies have investigated the large-scale growth of MoS2 by chemical vapour deposition to fabricate energy storage devices such as supercapacitors [5]. Since CVD method can be complex and requires precise control, more facile and costeffective methods such as the hydrothermal method is employed to synthesize 2D MoS2based thin layers with band gap varying from 1.5 eV to 0.8 eV [6]. Due to more metallic nature of selenium, high sensitivity towards light and chemical stability, its incorporation into the frameworks of MoS2 has been explored previously to improve electrical conductivity [7].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties

Rai,

Shreya,

Phogat

et al. 2024

MATEC Web Conf.

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Transition metal dichalcogenides show layered crystal structure with Van der Waals forces spanning the adjacent layers. Robust covalent bonds within each 2D sheet contribute to their outstanding electrical and optical properties. The incorporation of a chalcogen atom as a composite leads to enhanced optical and electrical characteristics of the TMDs, which could make them potential candidates for opto-electronic applications. In the present study, we have described the synthesis and characterizations of Se doped MoS2 nanolayers using a facile one-step hydrothermal method. XRD analysis revealed the diffraction peaks corresponding to MoS2 as well as Se which suggested the successful incorporation of selenium into MoS2 nanolayers. Optical analysis revealed an increased band gap of 1.01 eV after the addition of selenium, determined through UV-visible spectroscopy with a refractive index of 3.36. The morphological analysis by FESEM showed the formation of nanolayers and the EDX pattern showed the presence of Mo, S and Se. The enhanced bandgap of the as-synthesized material and the increased absorption in the UV region ensures its usage for the fabrication of efficient broadband photodetectors. Our future research focuses on the potential application of Se doped MoS2 nanolayers in the field of efficient photodetectors.

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Section: X-ray Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties

Rai,

Shreya,

Phogat

et al. 2024

MATEC Web Conf.

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“…Equations ( 9) and (10) are used to calculate HOMO (Highest Occupied Molecular Orbit) and LUMO (Lowest Unoccupied Molecular Orbit) energy levels [48,49].…”

Section: Refractive Index and Homo And Lumo Levelsmentioning

confidence: 99%

Electrochemical analysis of thermally treated two dimensional zinc sulphide hexagonal nano-sheets with reduced band gap

Phogat,

Shreya,

Jha

et al. 2023

Phys. Scr.

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Significantly reduced band gap (2.0 eV) ZnS nanoparticles are synthesized using microwave/ultraviolet/ultrasonic assisted hydrothermal route in a two step process. Initially, ZnS nanospheres are synthesized, showing a cubic structural phase with a band gap of 3.2 eV, which is further annealed at 1000°C to get the final product. Following annealing, the cubic ZnS undergoes a phase change to wurtzite ZnS, in the form of hexagonal nanosheets showing polymorphism phenomena, along with a reduced band gap of 2 eV. The optical analysis reveals a red shift in the absorbance region, transitioning from the absorption of UV radiations in cubic ZnS to visible radiations in wurtzite ZnS. TGA measurements and analysis also revealed the phase change of ZnS (cubic) to ZnS (Wurtzite) when heated at 1000 oC. Microstructural analysis reveals the formation of sheets oriented along (100) plane, which is evidenced by the interplanar spacing and lattice fringes. The photoluminscence spectra highlights quantum energy states present between the HOMO, which is 2.36 eV for cubic phase and 1.76 eV for the hexagonal phase, and the LUMO, with values of -0.84 eV for cubic while -0.24 for hexagonal ZnS. The CIE coordinates for wurtzite ZnS, at X= 0.55 and Y= 0.23, corresponds to red light emission. The suitability of wurtzite phase ZnS for solar cell applications has been demonstrated through electrochemical studies using Nyquist plot and cyclic voltrammetry (CV) techniques. CV demonstrates the presence of redox peaks and reversibility of the material during the redox process. The diffusive behaviour also confirmed by observing the variation of peak current with scan rate, following Rendle Sevick equation. The presence of Warburg diffusion in Nyquist plot indicates the efficient charge transfer dynamics of the material, suggesting high potential for exciton formation in energy production. Consequently, this material stands as promising candidate for efficient solar cells.

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The Role of Nanotechnology in Space Exploration and Colonization

Phogat,

Shreya,

Jha

et al. 2024

Advanced Technologies and Societal Change

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Elevated Refractive Index of MoS2 Amorphous Nanoparticles with a Reduced Band Gap Applicable for Optoelectronics

Cited by 19 publications

References 16 publications

Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties

Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties

Electrochemical analysis of thermally treated two dimensional zinc sulphide hexagonal nano-sheets with reduced band gap

The Role of Nanotechnology in Space Exploration and Colonization

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Elevated Refractive Index of MoS2 Amorphous Nanoparticles with a Reduced Band Gap Applicable for Optoelectronics

Cited by 19 publications

References 16 publications

Hydrothermal synthesis and characterization of selenium-doped MoS2 for enhanced optoelectronic properties

Hydrothermal synthesis and characterization of selenium-doped MoS2 for enhanced optoelectronic properties

Electrochemical analysis of thermally treated two dimensional zinc sulphide hexagonal nano-sheets with reduced band gap

The Role of Nanotechnology in Space Exploration and Colonization

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Product

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Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties

Hydrothermal synthesis and characterization of selenium-doped MoS₂ for enhanced optoelectronic properties