A5069293460- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- ZnO doping and properties
- Thin-Film Transistor Technologies
- Quantum Dots Synthesis And Properties
- Ga2O3 and related materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Photocatalysis Techniques
- Semiconductor materials and interfaces
- TiO2 Photocatalysis and Solar Cells
- Silicon and Solar Cell Technologies
- Graphene research and applications
- Dendrimers and Hyperbranched Polymers
- Supercapacitor Materials and Fabrication
- Chalcogenide Semiconductor Thin Films
- Mesoporous Materials and Catalysis
- Semiconductor materials and devices
- Carbon and Quantum Dots Applications
- Anodic Oxide Films and Nanostructures
- Advancements in Semiconductor Devices and Circuit Design
- Photonic Crystals and Applications
- Conducting polymers and applications
- Supramolecular Self-Assembly in Materials
- Perovskite Materials and Applications
- Advancements in Battery Materials
National Institute of Solar Energy
2022-2025
CSIR National Physical Laboratory of India
2000-2021
Academy of Scientific and Innovative Research
2020-2021
Council of Scientific and Industrial Research
2020
National Institute for Materials Science
2013-2018
Ben-Gurion University of the Negev
2016-2017
Indian Association for the Cultivation of Science
2007-2012
University of Maryland, College Park
1997
Graphene quantum dots (GQDs) synthesized by a direct chemical method have been used in combination with ZnO nanowires (NWs) to demonstrate their potential as solar harvesting material photovoltaic cells exhibiting an open circuit voltage of 0.8 V. The excited state interaction between the photoexcited GQDs and NWs has verified from charge-transfer process both emission spectroscopy measurements. This work implications for less expensive efficient next generation solid-state cells.
p - Zn O ∕ n Si heterojunction is achieved by depositing Al–N codoped p-type ZnO film on n-Si low-cost sol-gel technique. The junction shows good diode characteristics with rectification ratio (IF∕IR)∼10 at 4V in the dark. photoresponse of investigated studying current-voltage under ultraviolet (370nm) and visible light (450nm) illuminations. By fitting experimental data, we have proposed current transport mechanism to be dominated recombination tunneling lower space-charge limited higher...
Synthesis of various nanostructured semiconductor materials and processing them for different device fabrications has been at the forefront research last two decades. In comparison to spherical nanoparticles, anisotropic e.g. nanorods, nanowires, nanodisks have widely explored obtain a better performance devices. addition, it is also well-known that nanomaterials, on doping with suitable impurities, can enhance sensitivity speed. Combining both, we report here synthesis micrometer long In2S3...
We report on an efficient hybrid Si nanocrystal quantum dot modified radial p–n junction thinner solar cell that utilizes the advantages of effective exciton collection by energy transfer from nanocrystal-Si (nc-Si) dots to underlying nanowire arrays with excellent carrier separation and propagation via built-in electric fields junctions. Minimization recombination, optical, spectrum losses in this structure led a high efficiency 12.9%.
The organic carrier-selective layer, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) coated on Si wafers, has attracted a lot of attention toward the development low-cost and efficient hybrid solar cells (HSCs). Here, highly PEDOT:PSS/Si HSCs are reported via an effective surface microengineering as-cut, solar-grade thin aspect rarely addressed before, by simple one-step aqueous KOH process. influence microstructuring their light harvesting properties, polymer/Si...
Inorganic/organic hybrid radial heterojunction solar cells that combine vertically-aligned n-type silicon nanowires (SiNWs) with poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) have great potential for replacing commercial Si cells. The chief advantage of such is they exhibit higher absorbance a given thickness than cells, due to incident light-trapping within the NW arrays, thus enabling lower-cost cell production. We report herein on effects length, annealing and...
The authors report on the self-seeded growth of ZnO nanowire (NW) arrays glass substrates by a simple solvothermal method using two different sol concentrations for seed layer formation. formations hexagonal-shaped NWs with diameter 20–60nm 0.1M and mostly trapezoidal-shaped base width 135nm 0.03M have been explained considering longitudinal transversal growths NWs. photocurrent behavior NW in air as well vacuum is analyzed terms adsorbed oxygen water molecules.
We show by numerical simulations that discretized versions of commonly studied continuum nonlinear growth equations (such as the Kardar-Parisi-Zhang equation and Lai--Das Sarma--Villain equation) related atomistic models epitaxial have a generic instability in which isolated pillars (or grooves) on an otherwise flat interface grow time when their height depth) exceeds critical value. Depending details model, found version may or not be present truly equation, indicating behavior very...
We have demonstrated a novel and simple low-cost method to grow beaded nanochains of ZnO using an aqueous chemical growth method. Whatman filter paper (40) is used as the template. The generally made up cellulose fibers along which nanoparticles (NPs) initiated. When burnt at 700 °C temperature, NPs appear nanochain morphology while those synthesized without form lumped nanostructures any regular shape size. A model has been proposed explain mechanism. sharp strong green emission observed...
The effect of Cu doping (0.08–4%) on the structural, electrical, optical, and optoelectronic properties sol-gel ZnO thin films deposited glass substrates have been investigated. X-ray diffraction studies show that doped are single-phase wurtzite structure with random orientations. A decreasing trend in -axis parameter up to 0.5% is observed followed by an increasing above that. Field-emission scanning electron microscopy shows a grain texture. energy dispersive spectroscopy as well film...
Thin silicon solar cells can be a low‐cost effective photo‐conversion device, if the device efficiently absorb spectrum. Herein, new lithography‐free technique is developed for fabrication of quasiperiodic inverted‐pyramids arrays (SiIPAs), which show high‐light‐trapping phenomenon in ultraviolet–visible—near‐infrared (300–2000 nm). Fabricated SiIPA samples significant reduction reflectance (3%) absorption band (300–1000 A unique additional 33–44% compared to planar observed sub‐bandgap...
The application of variable angle spectroscopic ellipsometry (VASE) to the characterization thin films is very important because it facilitates understanding their physical and optical properties. To prepare a series film samples consisting TiO 2 :ZrO on TiN/Si substrate, we employed SYBILLA P200 equipment (manufactured by ABCD Technology) through process Chemical Beam Vapor Deposition (CBVD). composite material that has gained significant attention in various technological applications,...
Silica nano/microparticles have generated significant interest for the past decades, emerging as a versatile material with wide range of applications in photonic crystals, bioimaging, chemical sensors, and catalysis. This study focused on synthesizing silica ranging from 20 nm to 1.2 μm using Stöber modified methods. The particles exhibited photoluminescence emission across UV-visible range, specifically UV (∼290, ∼327, ∼339, ∼377 nm), blue (∼450 green (∼500 yellow (∼576 red (∼634 nm)...