A5085813842- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Copper-based nanomaterials and applications
- MXene and MAX Phase Materials
- Organic Electronics and Photovoltaics
- Quantum Dots Synthesis And Properties
- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Techniques
- Quantum and electron transport phenomena
- Gas Sensing Nanomaterials and Sensors
- Wireless Communication Networks Research
- Advanced Thermoelectric Materials and Devices
- Energy Efficient Wireless Sensor Networks
- Electronic and Structural Properties of Oxides
- PAPR reduction in OFDM
- Solid-state spectroscopy and crystallography
- Advanced Wireless Network Optimization
- Graphene research and applications
- Retinal Diseases and Treatments
- Semiconductor materials and interfaces
- Industrial Gas Emission Control
- Mobile Ad Hoc Networks
- Semiconductor materials and devices
National Institute of Advanced Industrial Science and Technology
2020-2025
Maharshi Dayanand University
2017-2024
Tokai University
2023
Indian Institute of Technology Bombay
2015-2021
Indian Institute of Technology Kanpur
2012
Well-aligned polycrystalline Ta<sub>3</sub>N<sub>5</sub>-NRs provide enhanced light harvesting and efficient generation extraction of charge carriers, leading to completely saturated photocurrent.
A semitransparent Ta 3 N 5 photoanode is designed for efficient and durable solar water splitting. The -CuInSe 2 tandem device exhibits an initial stabilized solar-to-hydrogen efficiency of ∼9% (highest metal oxides/nitrides) 4%, respectively.
High-performance solar-water-splitting technologies are of paramount interest for the cost-effective generation hydrogen fuel; however, their realization is majorly limited by poor solar light absorption and charge separation inside photoanode semiconductors. Herein, we develop photoanodes made from polycrystalline tantalum nitride nanorods (Ta3N5 NRs) to overcome above-mentioned challenges. The morphology crystalline properties Ta3N5 NRs optimized tuning essential parameters glancing angle...
Abstract With near unity quantum efficiency and operational stability surpassing 250 days in outdoor conditions, aluminum‐doped SrTiO 3 (Al:SrTiO ) with tailored cocatalysts is one of the promising photocatalysts for scalable solar H 2 production. Nevertheless, mechanistic insights behind Al‐doping Rh cocatalyst‐induced enhanced overall water splitting (OWS) are not well elucidated. Herein, detailed charge carrier dynamics from sub‐picosecond to milliseconds unveiled Al:SrTiO by transient...
Abstract Designing photoanode semiconducting materials with visible‐light absorption and minimal charge‐carrier recombination for achieving efficient solar‐to‐hydrogen (STH) conversion is challenging. Here, hybrid Ta 3 N 5 nanorods thin films are developed on transparent GaN/Al 2 O substrates. A a loaded cocatalyst achieves the best current density, i.e. 10.8 mA cm −2 , at 1.23 V versus reversible hydrogen electrode under simulated AM 1.5G solar illumination. In tandem configuration...
With excellent efficiencies being reported from multiple laboratories across the world, device stability and degradation mechanisms have emerged as key aspects that could determine future prospects of perovskite solar cells. However, related experimental efforts remain scattered due to lack any unifying theoretical framework. In this context, here we provide a comprehensive analysis ion migration effects in Specifically, show (a) effect ionic charges is almost indistinguishable dopant ions,...
Heterostructure-based photoanodes have been investigated to enhance light absorption and promote the generation extraction of charge carriers for efficient solar-to-hydrogen energy conversion. Oxy(nitride) semiconducting materials are promising candidates harvest visible solar spectrum; however, realization stable oxy(nitride) heterostructure-based remains a challenge. Here, we demonstrate core–shell heterojunction photoanode Ta3N5-nanorods/BaTaO2N that is obtained by combining glancing...
Abstract Oxysulfide semiconductor, Y 2 Ti O 5 S , has recently discovered its exciting potential for visible-light-induced overall water splitting, and therefore, imperatively requires the probing of unknown fundamental charge loss pathways to engineer photoactivity enhancement. Herein, transient diffuse reflectance spectroscopy measurements are coupled with theoretical calculations unveil nanosecond microsecond time range dynamics photogenerated carriers. In early range,...
Detailed numerical simulations are performed to probe performance loss mechanisms and limiting parameters of Ta<sub>3</sub>N<sub>5</sub>-NRs based photoanodes. Device modelling enables the development design strategies realize efficient solar water oxidation.
Abstract Photocatalytic water splitting is a simple means of converting solar energy into storable hydrogen energy. Narrow‐band gap oxysulfide photocatalysts have attracted much attention in this regard owing to the significant visible‐light absorption and relatively high stability these compounds. However, existing materials suffer from low efficiencies due difficulties synthesizing oxysulfides with suitable degrees crystallinity particle sizes, constructing effective reaction sites. The...
Recently, ionic thermoelectric supercapacitors have gained attention because of their high open circuit voltages, even for ions that are redox inactive. As a source voltage (electromotive force), an asymmetry in electric double layers developed by the adsorption at electrode surfaces kept different temperatures has previously been proposed. another source, Eastman entropy transfer, which is related to Soret coefficient, considered. Herein, we theoretically estimated voltages generated Stern...
Photocatalytic water splitting is an ideal means of producing hydrogen in a sustainable manner, and developing highly efficient photocatalysts vital aspect realizing this process. The photocatalyst Y2 Ti2 O5 S2 (YTOS) capable absorbing at wavelengths up to 650 nm exhibits outstanding thermal chemical durability compared with other oxysulfides. However, the photocatalytic performance YTOS synthesized using conventional solid-state reaction (SSR) process limited owing large particle sizes...
Exciton generation, dissociation, free carrier transport, and charge extraction play an important role in the short-circuit current (Jsc) power conversion efficiency of organic bulk heterojunction (BHJ) solar cell (SC). Here we study impact band offset at interfacial layer morphology active on carriers. The effects are evaluated inverted BHJ SC using zinc oxide (ZnO) as a buffer layer, prepared via two different methods: ZnO nanoparticle dispersed mixed solvents (ZnO A) sol–gel method B)....
Ferricyanide/ferrocyanide/guanidinium-based thermoelectrochemical cells have been investigated under different loading conditions in this work. Compared with ferricyanide/ferrocyanide-based devices, the device guanidinium-added electrolytes shows higher power and energy densities. We observed that enhanced performance is not due to ionic Seebeck effect of guanidinium but because configuration entropy change resulting from selective binding Gdm+ Fe(CN)64–. However, electrolyte does show...
The hydrogen evolution reaction (HER) of Rh nanoparticles (RhNP) coated with an ultrathin layer Cr-oxides (CrOx ) was investigated as a model electrode for the Cr2 O3 /Rh-metal core-shell-type cocatalyst system photocatalytic water splitting. CrOx electrodeposited over RhNP on transparent conductive fluorine-doped tin oxide (FTO) substrate. facilitates electron transfer process at /RhNP interface, leading to increased current density HER. Impedance spectroscopic analysis revealed that...
Mixed oxides of Rh–Cr (RhCrOx), containing Rh3+ and Cr3+ cations, are commonly used as cocatalysts for the hydrogen evolution reaction (HER) on particulate photocatalysts. The precise physicochemical mechanisms HER at catalytic sites these not well understood. In this study, model cocatalyst electrodes, composed nanoparticulate RhCrOx, were fabricated to investigate HER. Electroanalytical X-ray photoelectron spectroscopic measurements revealed that RhCrOx produces reduced Rh (Rh0) species by...
Y 2 Ti O 5 S , a stable oxysulfide photocatalyst with bandgap energy of 1.9 eV, is enhanced for H evolution via heterogeneous doping lower valency Sc 3+ at 4+ sites.
Efficient photoelectrochemical (PEC) water splitting requires charge separation and extraction from a photoactive semiconductor. Such transport process is widely believed to be dictated by the bulk energetics of However, its dependence on surface along semiconductor/electrolyte interface remains an open question. Here, we elucidate influence performance well-established Mo-doped BiVO4 photoanode whose are regulated facet-selective cocatalyst loading. Surprisingly, photodeposition RhOx CoOx...
Capacitance–voltage measurements along with the Mott–Schottky (MS) analysis are widely used for characterization of material and device parameters. Using a simple analytical model, supported by detailed numerical simulations, here, we predict that capacitance thin film devices scales as V–2 (V is applied potential), instead often V–0.5 dependence MS analysis, significant implications toward extraction parameters like doping density built-in voltage. Surprisingly, find predicted trends...
1-D numerical model of CIGS/CdS photocathode, well calibrated with reported experiments, is introduced to unravel various performance governing parameters and thereby predicts the maximum achievable efficiency.
The use of density functional theory (DFT) to calculate the optical properties materials frequently leads a predicted energy bandgap that is narrower than experimentally determined. When incorrectly evaluated by DFT, resulting absorption coefficient must be adjusted give correct value, in particular vicinity bandgap. Recently, method has been developed whereby dielectric for material calculated using DFT blueshifted and its amplitude scaled such function satisfies same moment sum rule as...
The use of stibnite (Sb2S3) as a light-harvesting material in thin film solar cells has received considerable research interest during the transition millennium. However, perovskite diminished field, and potential antimony Chalcogenides [Sb2(S,Se)3] was not explored thoroughly. Although these materials also provide bandgap tuning like perovskite, by varying composition S Se, it is popular for fabrication mainly because low efficiency based on it. In this paper, we present landscape...
Demonstration of high-efficiency large area cells with excellent stability is an important requirement towards commercialization perovskite solar (PSC). With reports high-quality grains, it evident that the performance such will be strongly influenced by phenomena like carrier recombination and ion migration at grain boundaries (GBs). Here, we develop a modeling framework to address limitation due GBs in PSCs. Through detailed numerical simulations, show photo-carrier has non-trivial...