A5063987684- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Organic Electronics and Photovoltaics
- TiO2 Photocatalysis and Solar Cells
- Advancements in Battery Materials
- Catalysis and Oxidation Reactions
- Multiferroics and related materials
- Supercapacitor Materials and Fabrication
- Copper-based nanomaterials and applications
- Organic and Molecular Conductors Research
- Crystal Structures and Properties
- Advanced Memory and Neural Computing
- Graphene research and applications
- Organic Light-Emitting Diodes Research
- Advanced Condensed Matter Physics
- Advancements in Solid Oxide Fuel Cells
- Advanced Battery Materials and Technologies
- Electrocatalysts for Energy Conversion
Indian Institute of Technology Indore
2023-2025
University of Sheffield
2018-2023
Sheffield City Council
2019-2020
Brown University
2015-2019
National Chemical Laboratory
2010-2016
National Institute of Solar Energy
2013-2015
Academy of Scientific and Innovative Research
2014-2015
Council of Scientific and Industrial Research
2011-2013
Savitribai Phule Pune University
2012-2013
The use of organometal trihalide perovskites (OTPs) in perovskite solar cells (PSCs) is revolutionizing the field photovoltaics, which being led by advances solution processing OTP thin films. First, we look at fundamental phenomena pertaining to nucleation/growth, coarsening, and microstructural evolution involved solution-processing films for PSCs from a materials-science perspective. Established scientific principles that govern some these are invoked context specific literature examples...
Abstract Large datasets are now ubiquitous as technology enables higher-throughput experiments, but rarely can a research field truly benefit from the data generated due to inconsistent formatting, undocumented storage or improper dissemination. Here we extract all meaningful device peer-reviewed papers on metal-halide perovskite solar cells published so far and make them available in database. We collect over 42,400 photovoltaic devices with up 100 parameters per device. then develop...
Abstract Self‐assembled monolayers (SAMs) are becoming widely utilized as hole‐selective layers in high‐performance p‐i‐n architecture perovskite solar cells. Ultrasonic spray coating and airbrush demonstrated here effective methods to deposit MeO‐2PACz; a carbazole‐based SAM. Potential dewetting of hybrid precursor solutions from this layer is overcome using optimized solvent rinsing protocols. The use air‐knife gas‐quenching then explored rapidly remove the volatile an MAPbI 3 film...
Organic–inorganic hybrid photo-detectors with a self-sufficient mode of operation represent research area great current interest. In most efficient photodetectors and optoelectronic devices compound semiconductors containing toxic elements such as Cd, As, Te, S, Se etc. are used these also expensive. Hence there is rapidly growing interest in replacing environmentally friendly earth-abundant materials. Herein, we report facile solution-processed fabrication self-powered organic–inorganic...
The δ → α phase transformation is a crucial step in the solution-growth process of formamidinium-based lead triiodide (FAPbI3) hybrid organic–inorganic perovskite (HOIP) thin films for solar cells (PSCs). Because addition cesium (Cs) stabilizes FAPbI3-based HOIPs, here our research focuses on FAPbI3(Cs) films. We show that having large grain size δ-FAPbI3(Cs) non-perovskite intermediate essential growth high-quality α-FAPbI3(Cs) HOIP Here coarsening and occur simultaneously during thermal...
A molecular ion (BF4−) substituted hybrid perovskite CH3NH3PbI(3−x)(BF4)x is synthesized. The shows significant enhancement in electrical conductivity at low frequencies and improved photoresponse under AM1.5 illumination as compared to the (CH3NH3PbI3).
Wide-bandgap perovskite solar cells (PSCs) based on organolead (I, Br)-mixed halide perovskites (e.g., MAPbI2Br and MAPbIBr2 with bandgaps of 1.77 2.05 eV, respectively) are considered as promising low-cost alternatives for application in tandem or multijunction photovoltaics (PVs). Here, we demonstrate that manipulating the crystallization behavior antisolvent bath is critical formation smooth, dense thin films these perovskites. Since growth grains from a precursor solution tends to be...
Mobile ions in hybrid perovskite semiconductors introduce a new degree of freedom to electronic devices suggesting applications beyond photovoltaics. An intuitive device model describing the interplay between ionic and charge transfer is needed unlock full potential technology. We describe perovskite-contact interfaces as transistors which couple redistribution energetic barriers controlling injection recombination. This reveals an amplification factor out phase current current. Our findings...
We use ultrasonic spray-coating to fabricate cesium-containing triple-cation perovskite solar cells with a power-conversion efficiency of up 17.8%. Our fabrication route involves brief exposure the partially wet spray-cast films low vacuum, process that is used control film crystallization. show are not vacuum-exposed relatively rough and inhomogeneous, while smooth consist small densely packed crystals. The techniques developed here represent step toward scalable industrially compatible...
A new variant of the classic pulsed laser deposition (PLD) process is introduced as a room-temperature dry for growth and stoichiometry control hybrid perovskite films through use nonstoichiometric single target ablation off-axis growth. Mixed halide nominally represented by CH3NH3PbI3–xAx (A = Cl or F) are also grown shown to reveal interesting trends in optical properties photoresponse. Growth good quality lead-free CH3NH3SnI3 demonstrated, corresponding presented. Finally, solar cells...
Abstract An encapsulation system comprising of a UV‐curable epoxy, solution processed polymer interlayer, and glass cover‐slip, is used to increase the stability methylammonium lead triiodide (CH 3 NH PbI ) perovskite planar inverted architecture photovoltaic (PV) devices. It found this acts as an efficient barrier extrinsic degradation processes (ingress moisture oxygen), that protects PV device from epoxy before it fully cured. This results in devices maintain 80% their initial power...
Carrier transport in methylammonium lead iodide (MAPbI 3 )‐based hybrid organic–inorganic perovskites (HOIPs) is obscured by vacancy‐mediated ion migration. Thus, the nature of migrating species (cation/anion) and their effect on electronic MAPbI has remained controversial. Temperature‐dependent pulsed voltage–current measurements thin films are performed under dark conditions, designed to decouple ion‐migration/accumulation transport. Measurement conditions (electric‐field history scan...
A report is presented on the fabrication of all solid‐state interdigitated flexible microsupercapacitor using ultrafast and highly scalable laser scribing technique, mesoporous carbon synthesized from biomass (mushroom) with hydrothermal preprocessing. The specific protocol used for synthesis renders some unique property features to material (surface area 2604 m² g −1 hierarchical pore size distribution) in context supercapacitor electrode application. polyvinyl alcohol (PVA)‐H 2 SO 4 gel...
The development of scalable deposition methods for perovskite solar cell materials is critical to enable the commercialization this nascent technology. Herein, we investigate use and processing nanoparticle SnO2 films as electron transport layers in cells develop ultrasonic spray coating slot-die coating, leading photovoltaic device efficiencies over 19%. effects postprocessing treatments (thermal annealing, UV ozone, O2 plasma) are then probed using structural spectroscopic techniques...
We report a facile solution based synthesis protocol to incorporate nitrogen within zinc oxide nanorods with substantially improved visible light harvesting via broadband absorption stretching from UV deep wavelengths (650 nm). also peculiar region maximum around 470 nm. Raman and X-ray photoelectron spectroscopy confirm incorporation of along other complex defects such as interstitials oxygen vacancies. Our N:ZnO appears pale orange opposed the yellow reported in works. It exhibits...
Back-contact PSCs are fabricated by depositing charge-selective electrodes and MAPbI<sub>3</sub> into micron-sized polymeric grooves, micro-modules formed serially-connecting grooves.
Cu2O nanoneedles are synthesized on a copper substrate by simple anodization and reducing ambient annealing protocol. ZnO nanorods grown ITO coated glass low temperature chemical route. The electronic photo-response properties of the p-Cu2O/n-ZnO flip-chip heterojunction then studied analyzed. We show that I–V characteristic is rectifying junction exhibits good photoresponse (∼120% under 1 V reverse bias) AM 1.5 (1 Sun) illumination. This nano-heterojunction far stronger as compared to...
The microstructure of the solid-PbI2 precursor thin film plays an important role in intercalation crystallization formamidinium lead triiodide perovskite (α-HC(NH2)2PbI3). It is shown that microstructurally engineered PbI2 films with porosity and low crystallinity are most favorable for conversion into uniform-coverage, phase-pure α-HC(NH2)2PbI3 films. Planar solar cells fabricated using these deliver power efficiency (PCE) up to 13.8%.
Here, we report the preparation of a flexible, free-standing, Pt- and TCO-free counter electrode in dye-sensitized solar cell (DSSC)-derived from polyethylenedioxythiophene (PEDOT)-impregnated cellulose paper. The synthetic strategy making thin flexible PEDOT paper is simple scalable, which can be achieved via situ polymerization all through roll coating technique. very low sheet resistance (4 Ω/□) obtained film 40 μm thick (PEDOT-p-5) found to superior conventional fluorine-doped tin oxide...
The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence performance when used in solar cell devices. Previous work on the use potassium iodide (KI) active layers passivate defects triple-cation mixed-halide perovskites has been shown enhance luminescence efficiency reduce current-voltage hysteresis. However, operational stability KI passivated cells under ambient conditions remains largely unexplored. By investigating with...