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315 results on '"Soni, Ashish"'

6. Efficient Multiple Exciton Generation in Monolayer MoS2

Author

Soni, Ashish, Kushavah, Dushyant, Lu, Li-Syuan, Chang, Wen-Hao, and Pal, Suman Kalyan

Subjects
Condensed Matter - Materials Science
Abstract

Utilizing the excess energy of photoexcitation that is otherwise lost as thermal effects can improve the efficiency of next-generation light-harvesting devices. Multiple exciton generation (MEG) in semiconducting materials yields two or more excitons by absorbing a single high-energy photon, which can break the Shockley-Queisser limit for the conversion efficiency of photovoltaic devices. Recently, monolayer transition metal dichalcogenides (TMDs) have emerged as promising light-harvesting materials because of their high absorption coefficient. Here, we report efficient MEG with low threshold energy and high (86%) efficiency in a van der Waals (vdW) layered material, MoS2. Through different experimental approaches, we demonstrate the signature of exciton multiplication and discuss the possible origin of decisive MEG in monolayer MoS2. Our results reveal that vdW-layered materials could be a potential candidate for developing mechanically flexible and highly efficient next generation solar cells and photodetectors.

Published
2022

14. Valley Degree of Freedom in Two-Dimensional van der Waals Materials

Author

Soni, Ashish and Pal, Suman Kalyan

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Layered materials can possess valleys that are indistinguishable from one another except for the momentum. These valleys are individually addressable in momentum space at the K and K' points in the first Brillouin zone. Such valley addressability opens up the possibility of utilizing the momentum state of quasi-particles as a completely new paradigm in quantum and classical information processing. This review focuses on the physics behind valley polarization and talks about carriers of valley degree of freedom (VDF) in layered materials. Then we provide a detailed survey of simple spectroscopic techniques commonly utilized to identify and manipulate valley polarization in van der Waals layered materials. Finally, we conclude with the recent developments towards the manipulation of VDF for device application and associated challenges., Comment: 61 pages, 11 figures

Published
2021
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17. Stress Analysis of Carbon Composite Material for Space-Based RF Component Using CAE Simulation

Author

Shah, Aaryan, Soni, Ashish, Vartak, Dhaval, Bhatt, Pina, Cavas-Martínez, Francisco, Editorial Board Member, Chaari, Fakher, Series Editor, di Mare, Francesca, Editorial Board Member, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Editorial Board Member, Ivanov, Vitalii, Series Editor, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Pramod P., Bhingole, editor, Desai, Ulkesh B., editor, and Goel, Sunkulp, editor

Published
2023
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32. Influence of Hyperparameter in Deep Convolution Neural Network Using High-Resolution Satellite Data

Author

Soni, Ashish, Koner, Radhakanta, Villuri, Vasanta Govind Kumar, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ghosh, Jayanta Kumar, editor, and da Silva, Irineu, editor

Published
2020
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33. 3D Reconstruction: An Emerging Prospect for Surveying

Author

Layek, Shirshendu, Singh, Rajat Kumar, Villuri, Vasanta Govind Kumar, Koner, Radhakanta, Soni, Ashish, Khare, Rupali, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ghosh, Jayanta Kumar, editor, and da Silva, Irineu, editor

Published
2020
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34. M-UNet: Modified U-Net Segmentation Framework with Satellite Imagery

Author

Soni, Ashish, Koner, Radhakanta, Villuri, Vasanta Govind Kumar, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Mandal, Jyotsna Kumar, editor, and Mukhopadhyay, Somnath, editor

Published
2020
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35. Semi-autonomous Collaborative Mobile Platform with Pre-diagnostics for Hospitals

Author

Gade, Vishal Reddy, Soni, Ashish, Rajaram, Bharghava, Seth, Deep, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, and Duffy, Vincent G., editor

Published
2020
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36. Long-Lived Interlayer Excitons in WS2/Ruddlesden–Popper Perovskite van der Waals Heterostructures

Author

Soni, Ashish, Ghosal, Supriya, Kundar, Milon, Pati, Swapan K., and Pal, Suman Kalyan

Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDs) and perovskites hold substantial promise for various optoelectronic applications such as light emission, photodetection, and energy harvesting. However, each of these materials possesses certain limitations that can be overcome by synergistically combining them to form heterostructures, thereby unveiling intriguing optical properties. In this study, we present an uncomplicated technique for crafting a van der Waals (vdW) heterojunction comprising monolayer WS2and a Ruddlesden–Popper (RP) perovskite, namely (TEA)2PbI4. By utilizing ultrafast transient absorption (TA) spectroscopy, we explored the charge carrier dynamics within the WS2/(TEA)2PbI4heterostructure. Our findings uncover a type-II band alignment in the heterostructure, facilitating rapid (within 260 fs) hole transfer from WS2to the perovskite and leading to the formation of interlayer excitons (IXs) with a much longer lifetime (728 ps). This strategic approach has the potential to contribute to the development of hybrid systems aimed at achieving high-performance optoelectronic devices.

Published
2024
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45. Low-Power Sequential Circuit Design Using Work-Function Engineered FinFETs

Author

Soni, Ashish, Umap, Abhijit, Mohapatra, Nihar R., Barbosa, Simone Diniz Junqueira, Series editor, Chen, Phoebe, Series editor, Filipe, Joaquim, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Yuan, Junsong, Series editor, Zhou, Lizhu, Series editor, Kaushik, Brajesh Kumar, editor, Dasgupta, Sudeb, editor, and Singh, Virendra, editor

Published
2017
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46. Press-Fit ACL Reconstruction

Author

Felmet, Gernot, Soni, Ashish, Becker, Roland, Musahl, Volker, Nakamura, Norimasa, editor, Zaffagnini, Stefano, editor, Marx, Robert G., editor, and Musahl, Volker, editor

Published
2017
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