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Light-matter Interactions in Transition Metal Dichalcogenides and Organohalide Perovskites for Photoabsorbers and Solar Cells

Description: Article discusses findings on two distinct classes of van der Waals solids, that based on in-organic transition metal dichalcogenides and the other based on a hybrid mixed organic-inorganic composition of 2D perovskites, specifically organo-halides (CH3(CH2)3NH3)2(CH3NH3)n-1PbnI3n+1.
Date: October 3, 2022
Creator: Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Black Phosphorus-Molybdenum Disulfide Hetero-Junctions Formed with Ink-Jet Printing for Potential Solar Cell Applications with Indium-Tin-Oxide

Description: Article on the implementation of liquid exfoliation to inkjet-print two-dimensional (2D) black phosphorous (BP) and molybdenum disulfide (MoS₂) p–n heterojunctions on a standard indium tin oxide (ITO) glass substrate in a vertical architecture. The authors also compared the optical and electrical properties of the inkjet-printed BP layer with that of the MoS₂ and the electrical properties of the mechanically exfoliated MoS₂ with that of the inkjet-printed MoS₂.
Date: May 18, 2021
Creator: Mehta, Ravindra & Kaul, Anupama
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Partner: UNT College of Engineering

Plexcitonic interactions in spherical and bi-pyramidical Au nanoparticles with monolayer WSe₂

Description: Article describes how plasmons associated with zero-dimensional (0D) metal nanoparticles and their synergistic interactions with excitons in two-dimensional (2D) semiconductors offer opportunities for remarkable spectral tunability not otherwise evident in the pristine parent materials, which necessitates an in-depth study elucidating the nature of the plasmonic and excitonic interactions, jointly referred to as plexcitons in order to understand the foundational aspects of the light–matter inte… more
Date: November 15, 2022
Creator: Jayanand, Kishan & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering

Spectroscopic, structural, and strain-dependent analysis of suspended bulk WSe2 sheets

Description: Article utilizing Raman spectroscopy and photoluminescence (PL) spectroscopy to analyze the phononic and electronic parameters in suspended bulk WSe₂ sheets, fabricated utilizing photolithography and wet chemical etching. The findings of this work will be beneficial in analyzing thermal, optical, and mechanical properties of WSe₂ in a suspended platform for its application in electronic, thermoelectric, and mechanical sensors in the future.
Date: February 8, 2022
Creator: Bandyopadhyay, Avra S. & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Sol-gel synthesized indium tin oxide as a transparent conducting oxide with solution-processed black phosphorus for its integration into solar-cells

Description: This article describes the synthesis of indium tin oxide (ITO) thin films using solgel processing with a mixture of InCl₃, methanol, and SnCl₂, where the solutions were spin coated onto glass substrates. The combined architecture of black phosphorus on ITO thin films shows promise in its use for transparent electronics, which can also serve as a stepping stone for future solar cell platforms.
Date: October 9, 2020
Creator: Mehta, Ravindra; Min, Misook & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Inkjet printing of liquid-exfoliated, highly conducting graphene/poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate) nanosheets for organic electronics

Description: In this article, highly dispersive graphene inks are demonstrated by liquid-phase exfoliation of the bulk graphite crystal in the solvent N-methyl-2-pyrrolidone (NMP).
Date: May 4, 2017
Creator: Desai, Jay A.; Biswas, Chandan & Kaul, Anupama
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Partner: UNT College of Engineering
open access

Inkjet-printed graphene’s electrical response to external gas flow for sensing applications

Description: Article discusses how understanding gas flow behavior is crucial in the ability of materials to sense toxic gasses for environmental, industrial, safety, agriculture, and related applications. In their study, the authors measure the electrical transport characteristics of ink jet printed graphene to incoming gas flow, specifically to N2 and CO2. This work serves as a prototypical platform to study the device characteristics of solution processed graphene and other 2D materials for more exotic g… more
Date: October 3, 2022
Creator: Mather, Thomas; Mehta, Ravindra K. & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Photoexcitation of C₆₀-WSe₂ hybrids for optical sensing

Description: Article discusses a study on synthesizing 0D-2D vdW heterostructure by spin coating C60 molecules on halide-assisted-low-pressure chemical-vapor-deposition (HA-LPCVD) produced monolayer WSe2 flakes. The study reveals that WSe2-C60 hybrid system is an appealing choice for next generation optical sensing devices.
Date: October 3, 2022
Creator: Jayanand, Kishan; Bastos, Silvino P. & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Methylammonium Lead Tri-Iodide Perovskite Solar Cells with Varying Equimolar Concentrations of Perovskite Precursors

Description: Article conducting a systematic study to tune the equimolar precursor ratio of the organic halide (methylammonium iodide; MAI) and metal halide (lead iodide; PbI2) in a fixed solvent mixture of N,N-dimethylformamide (DMF):dimethylsulfoxide (DMSO).
Date: December 9, 2021
Creator: Parashar, Mritunjaya & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Light–matter interactions in two-dimensional layered tungsten diselenide for gauging evolution of phonon dynamics

Description: Article exploring phonon dynamics in mechanically exfoliated two-dimensional WSe₂ using temperature-dependent and laser-power-dependent Raman and photoluminescence (PL) spectroscopy. The work reported sheds fundamental insights into the evolution of phonon dynamics in WSe₂ and should help pave the way for designing high-performance electronic, optoelectronic and thermoelectric devices in the future.
Date: May 12, 2020
Creator: Bandyopadhyay, Avra S.; Biswas, Chandan & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Chemical exfoliation efficacy of semiconducting WS2 and its use in an additively manufactured heterostructure graphene–WS2–graphene photodiode

Description: Article describes an experiment where various chemical exfoliation routes for semiconducting two-dimensional (2D) layered material WS2 were explored, including magnetic stirring (MS), shear mixing (SM), and horn-tip (HT) sonication.
Date: August 6, 2019
Creator: Desai, Jay A.; Adhikari, Nirmal & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Investigation of structural morphology and electrical properties of graphene-C₆₀ hybrids

Description: This article reports on the electrophoretic deposition of C₆₀ on graphene. The results suggest that graphene based C₆₀ structures are attractive as flexible transparent electrodes and are excellent electron accepting/charge transport materials for the construction of efficient photovoltaic devices.
Date: May 2, 2017
Creator: Chugh, Srishti; Biswas, Chandan; Echegoyen, Luis & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering

Liquid Phase Exfoliation of Tungsten Diselenide for Environmental Gas and Breath Sensing

Description: In this work, we performed an experimental analysis using a two-dimensional semiconducting transition metal dichalcogenide (TMD), specifically tungsten diselenide (WSe2), for gas sensor applications. Our method entailed building a chemically liquid exfoliated WSe2 gas sensing device with gold (Au) electrodes to measure its reaction and sensitivity to environmental gasses such as CO2 and N2. The 2D thin film was created through a solution processing method and electrically coupled in a two-termi… more
This item is restricted from view until June 1, 2026.
Date: May 2024
Creator: Zaman, Ashique
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Scalable, top-down optical lithography for electrically contacting monolayer crystallites of vapor grown WSe2 for gas sensing applications

Description: Article discusses how semiconducting two-dimensional transition-metal dichalcogenides (TMDs) have garnered a great deal of interest owing to their large surface-to-volume ratios compared to traditional three-dimensional (3D) semiconductors, and focuses on a specific TMD; tungsten diselenide (WSe₂). In their study, the authors demonstrate the halide-assisted low-pressure chemical vapor deposition (HA-LPCVD) of high crystalline-quality, monolayer WSe₂.
Date: October 3, 2022
Creator: Ademaj, Ideal; Mather, Thomas; Jayanand, Kishan & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Ultra-high Photoresponsivity in Suspended Metal-Semiconductor-Metal Mesoscopic Multilayer MoS₂ Broadband Detector from UV-to-IR with Low Schottky Barrier Contacts

Description: This article describes the performance of a multifaceted investigation comprising of atomic force microscopy (AFM0, photoluminescence (PL) and Raman spectroscopy to analyze the structural and chemical characteristics to help shed insights on the origins of the superior optoelectronic device performance.
Date: January 19, 2018
Creator: Saenz, Gustavo A.; Karapetrov, Goran; Curtis, James & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering

Perovskite Solar Cells and Avenues to Address Their Stability with the Incorporation of Two-Dimensional Materials

Description: In today's world, conventional energy resources (oil, gas, and coal) are most widely utilized for energy production, which has a negative influence on the environment, resulting in issues such as excessive air pollution, climate change, and global warming. Since we rely so much on fossil fuels for our energy needs, the harmful carbon emissions they produce, unfortunately, are one major reason for the climate change issues we face currently. This motivates us to seek alternative energy sources t… more
This item is restricted from view until January 1, 2028.
Date: December 2025
Creator: Jones, Brendan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Fabrication and characterization of inkjet-printed 2D perovskite optoelectronic devices

Description: Article presents the large scale synthesis of solution-processed 2D (CH₃(CH₂)₃NH₃)₂(CH₃NH₃)ₙ − 1PbₙI₃ₙ + 1 (n = 2, 3, and 4) perovskites, a family of layered compounds with composition-tunable bandgap, where inkjet printing was used to fabricate heterostructure, flexible photodetector devices. The flexible, inkjet-printed perovskite 2D heterostructures have significant potential for optoelectronic devices, which can enable broad possibilities with compositional tunability and versatility of the… more
Date: August 24, 2020
Creator: Min, Misook; Hossain, Ridwan F.; Ma, Liang-Chieh & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
open access

Biocompatible, large-format, inkjet printed heterostructure molybdenum disulfide-graphene photodetectors on conformable substrates

Description: This article describes an inkjet printed, biocompatible, heterostructure photodetector that was constructed using inks of photo-active molybdenum disulfide (MoS2) and electrically conducting graphene which facilitated charge collection of the photocarriers. The importance of such devices stems from their potential utility in age-related-macular degeneration, which is a condition where the photosensitive retinal tissue degrades with aging, eventually compromising vision. The absence of effective… more
Date: September 7, 2017
Creator: Hossain, Ridwan F.; Deaguero, Isaac G.; Boland, Thomas & Kaul, Anupama
Item Type: Refine your search to only Article
Partner: UNT College of Engineering
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