The Experts below are selected from a list of 1614318 Experts worldwide ranked by ideXlab platform
Marcus W Doherty - One of the best experts on this subject based on the ideXlab platform.
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radiation tolerance of two dimensional Material based devices for space applications
Nature Communications, 2019Co-Authors: Tobias Vogl, Kabilan Sripathy, Ankur Sharma, Prithvi Reddy, James Sullivan, J R Machacek, Linglong Zhang, F Karouta, Ben C Buchler, Marcus W DohertyAbstract:Characteristic for devices based on Two-Dimensional Materials are their low size, weight and power requirements. This makes them advantageous for use in space instrumentation, including photovoltaics, batteries, electronics, sensors and light sources for long-distance quantum communication. Here we present a comprehensive study on combined radiation effects in Earth’s atmosphere on various devices based on these nanoMaterials. Using theoretical modeling packages, we estimate relevant radiation levels and then expose field-effect transistors, single-photon sources and monolayers as building blocks for future electronics to γ-rays, protons and electrons. The devices show negligible change in performance after the irradiation, suggesting robust suitability for space use. Under excessive γ-radiation, however, monolayer WS2 shows decreased defect densities, identified by an increase in photoluminescence, carrier lifetime and a change in doping ratio proportional to the photon flux. The underlying mechanism is traced back to radiation-induced defect healing, wherein dissociated oxygen passivates sulfur vacancies. The potential of 2D Materials for space applications has been surfaced recently, however a comprehensive assessment of their suitability is currently missing. Here, the authors investigate the radiation effects in Earth’s atmosphere on various devices based on 2D transition metal dichalcogenides and hexagonal boron nitride.
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radiation tolerance of two dimensional Material based devices for space applications
arXiv: Materials Science, 2018Co-Authors: Tobias Vogl, Kabilan Sripathy, Ankur Sharma, Prithvi Reddy, James Sullivan, J R Machacek, Linglong Zhang, F Karouta, Ben C Buchler, Marcus W DohertyAbstract:Characteristic for devices based on Two-Dimensional Materials are their low size, weight and power requirements. This makes them advantageous for use in space instrumentation, including photovoltaics, batteries, electronics, sensors and light sources for long-distance quantum communication. Here, we present for the first time a comprehensive study on combined radiation effects in earth's atmosphere on various devices based on these nanoMaterials. Using theoretical modeling packages, we estimate relevant radiation levels and then expose field-effect transistors, single-photon sources and monolayers as building blocks for future electronics to gamma-rays, protons and electrons. The devices show negligible change in performance after the irradiation, suggesting robust suitability for space use. Under excessive $\gamma$-radiation, however, monolayer WS$_2$ showed decreased defect densities, identified by an increase in photoluminescence, carrier lifetime and a change in doping ratio proportional to the photon flux. The underlying mechanism was traced back to radiation-induced defect healing, wherein dissociated oxygen passivates sulfur vacancies.
Aravind Puthirath Balan - One of the best experts on this subject based on the ideXlab platform.
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a non van der waals two dimensional Material from natural titanium mineral ore ilmenite
Chemistry of Materials, 2018Co-Authors: Aravind Puthirath Balan, Sruthi Radhakrishnan, Ritesh Kumar, Ram P Neupane, Shyam Kanta Sinha, Liangzi Deng, Carlos A De Los Reyes, Amey Apte, Maggie PauloseAbstract:Two-Dimensional (2D) Materials from naturally occurring minerals are promising and possess interesting physical properties. A new 2D Material “Ilmenene” has been exfoliated from the naturally occurring titanate ore ilmenite (FeTiO3) by employing liquid phase exfoliation in a dimethylformamide solvent by ultrasonic bath sonication. Ilmenene displays a [001] orientation that is confirmed by transmission electron microscopy. Probable charge transfer excitation from Fe2+Ti4+ to Fe3+Ti3+ results in ferromagnetic ordering along with the antiferromagnetic phase accompanied by enhanced anisotropy due to surface spins. The 2D nature and band gap states help ilmenene form a heterojunction photocatalyst with titania nanotube arrays, capable of broad spectrum light harvesting and separating/transferring the photogenerated charges effectively for solar photoelectrochemical water splitting.
Peng Zhou - One of the best experts on this subject based on the ideXlab platform.
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small footprint transistor architecture for photoswitching logic and in situ memory
Nature Nanotechnology, 2019Co-Authors: Chunsen Liu, David Wei Zhang, Huawei Chen, Xiang Hou, Heng Zhang, Jun Han, Yugang Jiang, Xiaoyang Zeng, Peng ZhouAbstract:The need for continuous size downscaling of silicon transistors is driving the industrial development of strategies to enable further footprint reduction1,2. The atomic thickness of Two-Dimensional Materials allows the potential realization of high-area-efficiency transistor architectures. However, until now, the design of devices composed of Two-Dimensional Materials has mimicked the basic architecture of silicon circuits3–6. Here, we report a transistor based on a Two-Dimensional Material that can realize photoswitching logic (OR, AND) computing in a single cell. Unlike the conventional transistor working mechanism, the Two-Dimensional Material logic transistor has two surface channels. Furthermore, the Material thickness can change the logic behaviour—the architecture can be flexibly expanded to achieve in situ memory such as logic computing and data storage convergence in the same device. These devices are potentially promising candidates for the construction of new chips that can perform computing and storage with high area-efficiency and unique functions. The atomic thickness of Two-Dimensional Materials enables the realization of a small footprint transistor architecture for photoswitching logic computing in a single cell.
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Devices and applications of van der Waals heterostructures
Journal of Semiconductors, 2017Co-Authors: Chao Li, Peng Zhou, David Wei ZhangAbstract:Van der Waals heterostructures, composed of individual Two-Dimensional Material have been developing extremely fast. Synthesis of van der Waals heterostructures without the constraint of lattice matching and processing compatibility provides an ideal platform for fundamental research and new device exploitation. We review the approach of synthesis of van der Waals heterostructures, discuss the property of heterostructures and thoroughly illustrate the functional van der Waals heterostructures used in novel electronic and photoelectronic device.
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Mobility enhancement and hysteresis phenomenon in WSe 2 FETs
2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO), 2016Co-Authors: Chunsen Liu, Peng Zhou, Xiao Yan, David Wei ZhangAbstract:Two-Dimensional Materials are layered Materials with outstanding electrical and optical properties in atomic thickness. Here we report on a back-gate transistor with a Two-Dimensional Material WSe 2 as channel Material. Our device shows a significant mobility enhancement by Atomic layer deposition (ALD), from ∼0.95 cm2/Vs to ∼26 cm2/Vs. Moreover, we explored the hysteresis phenomenon in our device and fitted our data to make the mechanism clear.
Tianqi Wang - One of the best experts on this subject based on the ideXlab platform.
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electronegativity regulation on opt electronic properties of non van der waals two dimensional Material ga2o3
Computational Materials Science, 2020Co-Authors: Tianqi Wang, Yanqing Zhang, Chunhua Qi, Heyi Li, Shangli DongAbstract:Abstract Two-Dimensional (2D) Ga2O3 has broaden the horizon for opt-electronic devices due to its more superior properties than bulk. Further controlling its properties with effective methods in manufacturing process becomes the key of development. In this work, we present the importance of electronegativity resulting from different terminations and dopants under strains on opt-electronic properties of 2D Ga2O3. With different levels of deformation, the binding energy, vacancy formation energy, and doping energy can change significantly. The electronic properties including band gaps can be effectively tuned by different elements resulting from the difference of electronegativities. Factors including terminations and dopants under strains result in noticeable changes for optical and electronic characteristics. Different terminations can lead to unequal behaviors of dielectric functions and optical properties, while peaks from all dopants emerge in infrared and visible regions. These calculations can be used as a guidance to search for suitable opt-electronic properties during design and development of flexible devices based on 2D Ga2O3 Materials.
Leela Mohana Reddy Arava - One of the best experts on this subject based on the ideXlab platform.
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two dimensional Material reinforced separator for li sulfur battery
Journal of Physical Chemistry C, 2018Co-Authors: Ganguli Babu, Abdulrazzag Sawas, Naresh Kumar Thangavel, Leela Mohana Reddy AravaAbstract:Li–S batteries are heavily researched as they are capable of meeting the demands of electrification of transport systems, provided their inherent polysulfide shuttling can be prevented to enhance the cycle life. Although several approaches have been made to mitigate the shuttling effect, success is limited due to the poor adsorption capability of polysulfides on the cathode surface. Herein, we propose an efficient approach of using Two-Dimensional Materials with permanent dipoles in the separator to inhibit mass transport of polysulfides from cathode and subsequent parasitic reactions on the metallic lithium anode. Two-compartment H-cell experiments coupled with spectroscopic studies, such as ultraviolet–visible absorption, nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy, are used to demonstrate the interactions between the Two-Dimensional Materials-modified separator and polysulfide species. Furthermore, electrochemical properties reveal the excellent specific capacit...
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Two-Dimensional Material-Reinforced Separator for Li–Sulfur Battery C
The Journal of Physical Chemistry, 2018Co-Authors: Ganguli Babu, Abdulrazzag Sawas, Naresh Kumar Thangavel, Leela Mohana Reddy AravaAbstract:Li–S batteries are heavily researched as they are capable of meeting the demands of electrification of transport systems, provided their inherent polysulfide shuttling can be prevented to enhance the cycle life. Although several approaches have been made to mitigate the shuttling effect, success is limited due to the poor adsorption capability of polysulfides on the cathode surface. Herein, we propose an efficient approach of using Two-Dimensional Materials with permanent dipoles in the separator to inhibit mass transport of polysulfides from cathode and subsequent parasitic reactions on the metallic lithium anode. Two-compartment H-cell experiments coupled with spectroscopic studies, such as ultraviolet–visible absorption, nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy, are used to demonstrate the interactions between the Two-Dimensional Materials-modified separator and polysulfide species. Furthermore, electrochemical properties reveal the excellent specific capacity of 1210 mAh g–¹ and self-discharge studies suggest the feasibility of modified separator for commercial applications.
