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Sandhu HK, John JW, Jakhar A, Sharma A, Jain A, Das S. Self-powered, low-noise and high-speed nanolayered MoSe 2/p-GaN heterojunction photodetector from ultraviolet to near-infrared wavelengths. NANOTECHNOLOGY 2022; 33:305201. [PMID: 35439737 DOI: 10.1088/1361-6528/ac6817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Integration of nanolayered metal chalcogenides with wide-bandgap semiconductors forming pn heterojunction leads to the way of high-performance photodetection. This work demonstrates the fabrication of a few nanometer thick Molybdenum diselenide (MoSe2)/Mg-doped Gallium Nitride (p-GaN) heterostructure for light detection purposes. The device exhibits low noise broadband spectral response from ultraviolet to near-infrared range (300-950 nm). The band-alignment and the charge transfer at the MoSe2/p-GaN interface promote self-powered photodetection with high photocurrent to dark current ratio of 2000 and 1000 at 365 nm and 640 nm, respectively. A high responsivity of 130 A W-1, detectivity of 4.8 × 1010Jones, and low noise equivalent power of 18 fW/Hz1/2at 365 nm is achieved at an applied bias of 1 V. Moreover, the transient measurements reveal a fast rise/fall time of 407/710μsec for the fabricated device. These outcomes exemplify the viability of MoSe2/p-GaN heterostructure for high-speed and low-noise broadband photodetector applications.
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Affiliation(s)
- Harmanpreet Kaur Sandhu
- Centre for Applied Research in Electronics, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
- Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054, India
| | - John Wellington John
- Centre for Applied Research in Electronics, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
| | - Alka Jakhar
- Centre for Applied Research in Electronics, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
| | - Abhishek Sharma
- Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054, India
| | - Alok Jain
- Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054, India
- Centre for Personnel Talent Management, Metcalfe House, Delhi-110054, India
| | - Samaresh Das
- Centre for Applied Research in Electronics, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India
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2
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Wines D, Saritas K, Ataca C. A pathway toward high-throughput quantum Monte Carlo simulations for alloys: A case study of two-dimensional (2D) GaS xSe 1-x. J Chem Phys 2021; 155:194112. [PMID: 34800964 DOI: 10.1063/5.0070423] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The study of alloys using computational methods has been a difficult task due to the usually unknown stoichiometry and local atomic ordering of the different structures experimentally. In order to combat this, first-principles methods have been coupled with statistical methods such as the cluster expansion formalism in order to construct the energy hull diagram, which helps to determine if an alloyed structure can exist in nature. Traditionally, density functional theory (DFT) has been used in such workflows. In this paper, we propose to use chemically accurate many-body variational Monte Carlo (VMC) and diffusion Monte Carlo (DMC) methods to construct the energy hull diagram of an alloy system due to the fact that such methods have a weaker dependence on the starting wavefunction and density functional, scale similarly to DFT with the number of electrons, and have had demonstrated success for a variety of materials. To carry out these simulations in a high-throughput manner, we propose a method called Jastrow sharing, which involves recycling the optimized Jastrow parameters between alloys with different stoichiometries. We show that this eliminates the need for extra VMC Jastrow optimization calculations and results in significant computational cost savings (on average 1/4 savings of total computational time). Since it is a novel post-transition metal chalcogenide alloy series that has been synthesized in its few-layer form, we used monolayer GaSxSe1-x as a case study for our workflow. By extensively testing our Jastrow sharing procedure for monolayer GaSxSe1-x and quantifying the cost savings, we demonstrate how a pathway toward chemically accurate high-throughput simulations of alloys can be achieved using many-body VMC and DMC methods.
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Affiliation(s)
- Daniel Wines
- Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
| | - Kayahan Saritas
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
| | - Can Ataca
- Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
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Wines D, Saritas K, Ataca C. A first-principles Quantum Monte Carlo study of two-dimensional (2D) GaSe. J Chem Phys 2020; 153:154704. [DOI: 10.1063/5.0023223] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Daniel Wines
- Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
| | - Kayahan Saritas
- Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
| | - Can Ataca
- Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
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Sa B, Chen J, Yang X, Yang H, Zheng J, Xu C, Li J, Wu B, Zhan H. Elastic Anisotropy and Optic Isotropy in Black Phosphorene/Transition-Metal Trisulfide van der Waals Heterostructures. ACS OMEGA 2019; 4:4101-4108. [PMID: 31459619 PMCID: PMC6648407 DOI: 10.1021/acsomega.9b00011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 02/04/2019] [Indexed: 05/31/2023]
Abstract
Anisotropic two-dimensional materials with direction-dependent mechanical and optical properties have attracted significant attention in recent years. In this work, based on density functional theory calculations, unexpected elastic anisotropy and optical isotropy in van der Waals (vdW) heterostructures have been theoretically proposed by assembling the well-known anisotropic black phosphorene (BP) and transition-metal trisulfides MS3 (M = Ti, Hf) together. It is interesting to see that the BP/MS3 vdW heterostructures show anisotropic flexibility in different directions according to the elastic constants, Young's modulus, and Poisson's ratio. We have further unraveled their physical origin of the type-II band structure nature with their conduction band minimum and valence band maximum separated in different layers. In particular, our results on the optical response functions including the excitonic effects of the BP/MS3 vdW heterostructures suggest their unexpected optical isotropies together with the enhancements of the solar energy conversion efficiency.
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Affiliation(s)
- Baisheng Sa
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Jianhui Chen
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Xuhui Yang
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Honglei Yang
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Jingying Zheng
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Chao Xu
- Xiamen Talentmats New Materials Science
& Technology Co., Ltd., Xiamen 361015, P. R. China
| | - Junjie Li
- School of Applied Mathematics, Xiamen University
of Technology, Xiamen 361024, P. R. China
| | - Bo Wu
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
| | - Hongbing Zhan
- Key Laboratory of
Eco-materials Advanced Technology, College of Materials Science and
Engineering, Fuzhou University, Fuzhou 350108, P. R. China
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Meng Z, Stolz RM, Mendecki L, Mirica KA. Electrically-Transduced Chemical Sensors Based on Two-Dimensional Nanomaterials. Chem Rev 2019; 119:478-598. [PMID: 30604969 DOI: 10.1021/acs.chemrev.8b00311] [Citation(s) in RCA: 244] [Impact Index Per Article: 48.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Electrically-transduced sensors, with their simplicity and compatibility with standard electronic technologies, produce signals that can be efficiently acquired, processed, stored, and analyzed. Two dimensional (2D) nanomaterials, including graphene, phosphorene (BP), transition metal dichalcogenides (TMDCs), and others, have proven to be attractive for the fabrication of high-performance electrically-transduced chemical sensors due to their remarkable electronic and physical properties originating from their 2D structure. This review highlights the advances in electrically-transduced chemical sensing that rely on 2D materials. The structural components of such sensors are described, and the underlying operating principles for different types of architectures are discussed. The structural features, electronic properties, and surface chemistry of 2D nanostructures that dictate their sensing performance are reviewed. Key advances in the application of 2D materials, from both a historical and analytical perspective, are summarized for four different groups of analytes: gases, volatile compounds, ions, and biomolecules. The sensing performance is discussed in the context of the molecular design, structure-property relationships, and device fabrication technology. The outlook of challenges and opportunities for 2D nanomaterials for the future development of electrically-transduced sensors is also presented.
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Affiliation(s)
- Zheng Meng
- Department of Chemistry, Burke Laboratory , Dartmouth College , Hanover , New Hampshire 03755 , United States
| | - Robert M Stolz
- Department of Chemistry, Burke Laboratory , Dartmouth College , Hanover , New Hampshire 03755 , United States
| | - Lukasz Mendecki
- Department of Chemistry, Burke Laboratory , Dartmouth College , Hanover , New Hampshire 03755 , United States
| | - Katherine A Mirica
- Department of Chemistry, Burke Laboratory , Dartmouth College , Hanover , New Hampshire 03755 , United States
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Wang X, Miao Z, Ma Y, Chen H, Qian H, Zha Z. One-pot solution synthesis of shape-controlled copper selenide nanostructures and their potential applications in photocatalysis and photothermal therapy. NANOSCALE 2017; 9:14512-14519. [PMID: 28930346 DOI: 10.1039/c7nr04851c] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Developing a facile and reliable method for the fabrication of transition metal chalcogenides is a vital and endless pursuit of scientific and technological disciplines. In this work, we develop a one-pot solution approach to obtain copper selenide nanostructures with different morphologies and crystal structures (Cu2Se nanoparticles, CuSe nanoplates and CuSe2 nanosheets). In comparison to previously reported methods, our method did not use expensive and very toxic raw materials. After detailed studies of reaction conditions, including temperature, reaction time, and feeding amount of surfactants and precursors, we found that the feeding ratio of precursors played a key role in the crystal structures and morphologies of the final products. Moreover, as a proof-of-concept study, the potential applications of the as-prepared copper selenide nanostructures in the photocatalytic discoloration of aqueous methylene blue (MB) under visible light irradiation and near-infrared (NIR) light induced photothermal therapy for cancer treatment were investigated. Encouraged by their strong photocatalytic activities and high photothermal conversion efficiencies (calculated to be 51.0%, 49.5% and 48.9% for Cu2Se nanoparticles, CuSe nanoplates and CuSe2 nanosheets, respectively), we believe that copper selenide nanostructures fabricated from the one-pot solution approach developed in this work would be promising candidates for a wide variety of emerging applications.
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Affiliation(s)
- Xianwen Wang
- School of Biological and Medical Engineering, Hefei University of Technology, Hefei, Anhui 230009, P. R. China.
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Liu R, Wang C, Li Y, Xie Y, Chen Q, Chen Z, Liu Q. Intercalating copper into layered TaS2 van der Waals gaps. RSC Adv 2017. [DOI: 10.1039/c7ra08630j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient method to intercalate copper atoms into 2D layered 1T-TaS2 without disturbing the crystal structure of the target material.
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Affiliation(s)
- Rui Liu
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191
- China
| | - Cong Wang
- National Center for Nanoscience and Technology
- Beijing 100190
- China
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics
- TEDA Institute of Applied Physics
| | - Yuanyuan Li
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191
- China
| | - Yong Xie
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191
- China
| | - Qiang Chen
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191
- China
| | - Ziyu Chen
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191
- China
| | - Qian Liu
- National Center for Nanoscience and Technology
- Beijing 100190
- China
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics
- TEDA Institute of Applied Physics
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Wang C, Yang S, Xiong W, Xia C, Cai H, Chen B, Wang X, Zhang X, Wei Z, Tongay S, Li J, Liu Q. Gate-tunable diode-like current rectification and ambipolar transport in multilayer van der Waals ReSe2/WS2 p–n heterojunctions. Phys Chem Chem Phys 2016; 18:27750-27753. [DOI: 10.1039/c6cp04752a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vertically stacked van der Waals (vdW) heterojunctions of two-dimensional (2D) transition metal dichalcogenides (TMDs) are widely studied due to their fascinating properties.
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