A5059216136- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Tribology and Wear Analysis
- Brake Systems and Friction Analysis
- Semiconductor materials and interfaces
- Copper-based nanomaterials and applications
- Vibration Control and Rheological Fluids
- ZnO doping and properties
- Silicon and Solar Cell Technologies
- Advanced Thermoelectric Materials and Devices
- Natural Fiber Reinforced Composites
- Structural Response to Dynamic Loads
- Railway Engineering and Dynamics
- High-Velocity Impact and Material Behavior
- Transportation Safety and Impact Analysis
- Advanced Materials Characterization Techniques
- Intermetallics and Advanced Alloy Properties
- Silicon Nanostructures and Photoluminescence
- solar cell performance optimization
- Surface and Thin Film Phenomena
- Adhesion, Friction, and Surface Interactions
- Polymer Nanocomposites and Properties
- GaN-based semiconductor devices and materials
- Structural Engineering and Vibration Analysis
- Mechanical stress and fatigue analysis
Hong Kong Polytechnic University
2022
Thapar Institute of Engineering & Technology
2017-2021
University of Delhi
2021
Inspiration Innovation Synergy University
2020
Anand International College of Engineering
2020
GITAM University
2020
Indian Institute of Management Visakhapatnam
2019-2020
National Institute for Materials Science
2014-2018
Indian Institute of Technology Delhi
2007-2018
Ibaraki University
2018
Cu 2 ZnSn(S,Se) 4 (CZTS(e)) solar cells suffer from low‐open‐circuit voltages that have been blamed on the existence of band gap fluctuations, with different possible origins. In this paper, we show both theoretical and experimental standpoints disorder Zn atoms is in all probability primary cause these fluctuations. First, quantification Cu–Zn CZTS thin films presented. The results indicate prevalent majority practical samples used for cells. Then, ab initio calculations arrangements...
Employing a hybrid density functional theory, we reveal the origin of large absorption coefficient in BaSi2, which is roughly two to eighty times larger at ħω − Eg = 0.5 eV than other conventional absorbers such as Si, GaAs, CdTe, CuInSe2, and Cu2ZnSnS4. This explained on basis electronic band structure whereby lowest conduction (CB) has small dispersion, owing localized Ba-d states, resulting flat bands. Consequently, these bands contribute wide range optical low-energy region lead high...
The main aim of this study is to scrutinize promising plasmonic materials by understanding their electronic structure and correlating them the optical properties selected refractory materials. For purpose, conductive ceramics TiC, ZrC, HfC, TaC, WC, TiN, ZrN, HfN, TaN, WN are studied systematically means first-principles density functional theory. A full ab initio procedure calculate plasma frequency from band discussed. dielectric functions calculated including interband intraband...
The current thin-film photovoltaic (PV) technologies are dominated by CdTe and Cu(In,Ga)Se2 compounds. However, due to the limited availably toxicity of elements in these technologies, research efforts directed search alternative earth abundant materials. Therefore, this work, we analyze CuSbS2 CuBiS2 compounds as absorber materials for future solar cells. Employing a first-principles approach within density functional theory, calculate structural, electronic, optical properties We show that...
We report on a barium disilicide (BaSi<sub>2</sub>) system as potential absorber material for thin-film solar cells within the density functional theory framework by using advanced methods like GW and BSE elucidate first molecular orbital diagram defect physics in BaSi<sub>2</sub>.
Cu3BiS3 is a potential photovoltaic material. Employing first-principles approach, we calculate the structural, electronic, and optical properties of Cu3BiS3, demonstrate that an indirect band gap semiconductor in contrast to similar chalcogenide semiconductors. The fundamental energy estimated be Eg ≈ 1.5–1.7 eV. analysis reveals has much stronger absorption coefficient (&gt;105 cm−1) compared other Cu-S based materials like CuInS2 Cu2ZnSnS4. This explained by presence localized Bi 6p...
In order to meet the increasing demand for electric power generation from solar energy conversion, development of efficient light absorber materials has been awaited. To this end, electronic and optical properties advanced alkaline-earth-metals disilicides digermanides (SrSi2, BaSi2, SrGe2, BaGe2) are studied by means density functional theory using HSE06 exchange-correlation functional. Our calculations show that all these orthorhombic structured compounds have fundamental indirect band...
In this work, employing a first-principles approach, the structural, electronic, optical, as well defect physics of AIBIIIO2 (AI = Cu or Ag, BIII Al, Ga In) compounds are discussed. We show that all these delafossite have indirect band gaps with gap energy in range 1.6–3.6 eV. also estimate lowest direct energies to be 2.6–4.0 Optical characteristics reveal exhibit significant anisotropy for both real and imaginary parts dielectric function. Furthermore, we find absorption onset is...
Ternary Cu(Sb,Bi)(S,Se)2 compounds such as CuSbS2, CuSbSe2, CuBiS2, and CuBiSe2, are potential photovoltaic materials that contain earth abundant low-cost elements. Employing an atomistic first-principles modeling within the density function theory we calculate electronic optical properties of compounds. We find these four have indirect fundamental band gaps in range 1.1–1.7 eV. The gap nature is different to previous experimental measurements (direct gap). Calculations reveal strong...
Chemical composition is the primary factor that determines electronic band structure and thus also influences optical properties of plasmonic ceramics including nitrides oxides.In this work, TiN, ZrN their hypothetical intermediate alloys Ti 1-x Zr x N (x = 0, 0.25, 0.50, 0.75, 1), are studied by using first-principles density functional theory.We demonstrate effects tuning (band engineering) on dielectric varying concentration metallic constituents.Our calculations reveal bulk plasma...
Abstract Kesterite semiconductors, derived from the mineral Cu 2 (Zn,Fe)SnS 4 , adopt superstructures of zincblende archetype. This family semiconductors is chemically flexible with possibility to tune physical properties over a large range by modifying chemical composition, while preserving same structural backbone. In simplest case, three metals (e.g. Cu, Zn and Sn) occupy cation sublattice, which gives rise competing orderings (polymorphs) for order–disorder transitions. The rich physics...
Abstract The awareness of eco‐friendly materials has increased the demand for natural fibers. Natural fibers have many advantages over other like short growing time, easy availability, cheap, and with good mechanical properties. WHO announced that trending side effects on environment human beings. Asbestos been already a proven cause cancers. In this research Coconut fiber, fiber used in brake pad as friction material. different percentage 2‐8 wt% was to develop new samples compared standard...
In this study, the comparative role of nano-and micro-sized Cu powder in exploring influence on tribo-performance friction materials form brake-pads is discussed. Two composites were developed by keeping allthe ingredients constant and varying size selected filler (copper powder). The micro-composite contained 10 % (wt) (400–600 μm) while nano-composite only a part (2 %) micro-powder was replaced nano-powder (50–200 nm) since replacement not possible because agglomeration problem. One more...