A5057835323- Perovskite Materials and Applications
- ZnO doping and properties
- Ga2O3 and related materials
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Solar-Powered Water Purification Methods
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Chalcogenide Semiconductor Thin Films
- Solar Thermal and Photovoltaic Systems
- Membrane Separation Technologies
- Transition Metal Oxide Nanomaterials
- Copper-based nanomaterials and applications
- Advanced Memory and Neural Computing
- Magnetic and transport properties of perovskites and related materials
- Ferroelectric and Negative Capacitance Devices
- Advanced Photocatalysis Techniques
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Essential Oils and Antimicrobial Activity
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Analytical Methods in Pharmaceuticals
- Supramolecular Self-Assembly in Materials
- TiO2 Photocatalysis and Solar Cells
Indian Institute of Technology Jammu
2018-2025
Haldia Institute of Technology
2025
Indian Institute of Science Education and Research Pune
2024
King Abdullah University of Science and Technology
2014-2017
Indian Association for the Cultivation of Science
2008-2016
Nanyang Technological University
2013
Jadavpur University
1998
Organometal halide perovskites have recently attracted tremendous attention due to their potential for photovoltaic applications, and they are also considered as promising materials in light emitting lasing devices. In this work, we investigated detail the cryogenic steady state photoluminescence properties of a prototypical hybrid perovskite CH3NH3PbI3-xClx. The evolution characteristics two excitonic peaks coincides with structural phase transition around 160 K. Our results further...
Heterostructured photoconductors based on hybrid perovskites and 2D transition-metal dichalcogenides are fabricated characterized. Due to the superior properties of CH3NH3PbI3 WS2, as well efficient interfacial charge transfer, such show high performance with on/off ratio ≈105 responsivity ≈17 A W−1. Furthermore, response times heterostructured four orders magnitude faster compared counterpart a perovskite single layer. As service our authors readers, this journal provides supporting...
High-quality perovskite monocrystalline films are successfully grown through cavitation-triggered asymmetric crystallization. These enable a simple cell structure, ITO/CH3NH3PbBr3/Au, with near 100% internal quantum efficiency, promising power conversion efficiencies (PCEs) >5%, and superior stability for prototype cells. Furthermore, the devices using hole-transporter-free structure yield PCEs ≈6.5%, highest among other similar-structured CH3NH3PbBr3 solar cells to date. As service our...
In this work, we explored perovskite oxide SrTiO3 (STO) for the first time as electron-transporting layer in organolead trihalide solar cells. The steady-state photoluminescence (PL) quenching and transient absorption experiments revealed efficient photoelectron transfer from CH3NH3PbI3–xClx to STO. Perovskite cells with meso-STO exhibit an open circuit voltage of 1.01 V, which is 25% higher than value 0.81 V achieved control device conventional meso-TiO2. addition, increase 17% fill factor...
The anomalous photocurrent decay in aqueous solution grown ZnO nanowires (NWs) under steady ultraviolet light illumination have been investigated. growth-decay measurements using the above-band and subband gap excitation energies as-grown annealed NWs show that while a VZn-related defect complex is formed by surface adsorbed H2O molecules, faster carrier trapping O2 molecules slower recombination at defect, Zni cause supported results of spectra photoluminescence measurements. predicted...
Abstract Integrating materials with distinct lattice symmetries and dimensions is an effective design strategy toward realizing novel devices unprecedented functionalities, but many challenges remain in synthesis device design. Here, a heterojunction memory made of wurtzite ZnO nanorods grown on perovskite Nb‐doped SrTiO 3 (NSTO) reported, the electronic properties which can be drastically reconfigured by applying voltage light. Despite structures NSTO, consistent nature single crystallinity...
ZnO nanowires (NWs) with a ZnS coating are synthesized in order to modify the surface without changing diameter of NWs. They have wurtzite at core and cubic outer layer. The NWs show sharp ultraviolet broad visible emission photoluminescence spectra. Surface modification has led change position maxima ZnO−ZnS photocarrier relaxation under steady UV illumination occurs NW arrays but is absent arrays. dark current value for both type similar, whereas photocurrent much higher surface-modified...
Here we report that mesoporous ternary oxide Zn2SnO4 can significantly promotes the crystallization of hybrid perovskite layers and serves as an efficient electron transporting material in solar cells. Such devices exhibit energy conversion efficiency 13.34%, which is even higher than achieved with commonly used TiO2 similar experimental conditions (9.1%). Simple one-step spin coating CH3NH3PbI3–xClx on found to lead rapidly crystallized bilayer structure without any solvent engineering....
Solar-driven interfacial water evaporation (SIWE) has emerged as a promising avenue for cost-effective freshwater production from seawater or wastewater. However, the simultaneous of volatile organic compounds (VOCs) presents limitation widespread implementation this technique. Thus, developing dual-functional evaporators capable both desalining and degrading VOCs is challenging. Herein, we fabricated an iron-based metal-organic framework MIL-88A/carbon nanotubes (CNTs) poly(vinyl alcohol)...
We have investigated the carrier relaxation process during photoconduction in quasi-one-dimensional (Q1D) ZnO nanowires (NWs) of diameters 29–36nm on different substrates using photocurrent transient measurements. Ultraviolet (UV) sensitive NWs show around three to four orders change photo-to-dark current ratio. Under steady UV illumination, photocarrier occurs through two-electron process—carrier loss due trapping by surface states and recombination at deep defect states. The results...
The effect of surface capping with poly(vinyl alcohol) (PVA) on the photocarrier relaxation aqueous chemically grown ZnO nanowires (NWs) has been investigated. decay in photocurrent during steady ultraviolet illumination due to reduced capped NWs, as evidenced from a decrease only by 12% its maximum value under for 15 min and 49% same interval time as-grown NWs. modification is confirmed FESEM, HRTEM, FTIR results. photoluminescence spectrum shows an enhanced emission defect-related NWs...
Finding solar absorbers that are chemically stable and made of abundant elements will promote the improvement photovoltaic technology. Perhaps surprisingly, prototypical Mott insulator LaVO${}_{3}$ is promising in this arena, as it strongly absorbs visible light has a suitable band gap. The authors study optical transport properties material working device, discussing advantages challenges using insulator, showing way for further cells based on correlated electron systems.
Organic-inorganic hybrid diodes are very promising for solution processing, low cost, high performance optoelectronic devices. Here, we report a quality p-n heterojunction diode composed of n-type inorganic Sb2S3 and p-type organic 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) with rectification ratio ∼102 at an applied bias 1 V. On illumination visible light (470 nm, 1.82 mW/cm2), the current value in our device becomes 8 × 102 times that its dark even...
In this work, we investigated the effects of high operating temperature and thermal cycling on photovoltaic (PV) performance perovskite solar cells (PSCs) with a typical mesostructured (m)-TiO2-CH3NH3PbI3-xClx-spiro-OMeTAD architecture. After temperature-dependent grazing-incidence wide-angle X-ray scattering, in situ diffraction, optical absorption experiments were carried out, durability PSCs was tested by subjecting devices to repetitive heating 70 °C cooling room (20 °C). An unexpected...
Synergistic generation of freshwater and electricity using solar light would be an ideal solution for global challenges energy demands. Recently, interface steam has been considered one the promising cost-effective alternatives generation. Here, we have systematically maintained salinity gradient within two-legged paper-based microfluidic channels to transport wastewater from reservoir evaporator surface generate all-day-long. Flowing seawater (3.5 wt % NaCl) on leg tap water other...
Interfacial solar steam generation is considered a promising alternative for freshwater production. Although efforts have been invested in enhancing the evaporation rate (ER), considerable discrepancies exist between ER and actual collection yield when used practical devices. Here, we prepared water purifier with conical evaporator cylindrical condenser of same diameter achieved nearly 100% condensation efficiency by conducting wastewater through surface via capillary action. A 2.5-fold...
Low-cost, stable, and easy-to-fabricate resistive switching memory (RSM) devices are highly desirable for next-generation nonvolatile memories. Spinel-structured CuFe2O4 (CFO), composed of earth-abundant, environmentally friendly elements, is a multifunctional material mainly featuring super-paramagnetism. This work explores the potential spin-coated CFO thin films as an active in RSM. A simple fluorine-doped tin oxide (FTO)/CFO/Ag device shows bipolar behavior with problems like scattered...
We have sputtered Zn onto quasi-one-dimensional ZnO nanowires (NWs) in order to investigate the effect of diffusion on photoluminescence and photoconduction properties NWs. Elemental mapping clearly indicates higher concentration NWs due Zn. The Zn-sputtered show an enhanced ultraviolet emission with 7 nm red shift. Since ionization energy Zni is 51 meV, PL a shift corelated coupling between free exciton zinc interstitials (Zni) defects. photocurrent transients almost 20 times more...
ZnO nanowires (NWs) have been decorated with Pd nanoparticles of sizes less than 10 nm (Pd–ZnO NWs) via a chemical solution route. The microstructural characterizations done using field emission scanning electron and high-resolution transmission microscopes. effects attaching to the walls NWs investigated by studying ultraviolet (UV) photosensitivity photoluminescence (PL) properties. surface-modified show UV more double response seven times faster compared bare NWs. photocarrier relaxation...
Conducting saltwater through filter paper strips to the evaporator surface of a solar steam generator produces sufficient electricity run small electronic appliances continuously without any energy storage device.
Multifunctional nanoporous carbon with high specific surface areas, tunable pore structures, good conductivity, and optical absorption is a promising material for solar steam generation supercapacitor applications.