A5070916568- Perovskite Materials and Applications
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Chalcogenide Semiconductor Thin Films
- Supercapacitor Materials and Fabrication
- Photochemistry and Electron Transfer Studies
- Advancements in Battery Materials
- Luminescence and Fluorescent Materials
- Metal complexes synthesis and properties
- Electrochemical Analysis and Applications
- Advanced battery technologies research
- Molecular Junctions and Nanostructures
- Carbon and Quantum Dots Applications
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- Molecular Sensors and Ion Detection
- Porphyrin and Phthalocyanine Chemistry
- 2D Materials and Applications
- Crystallization and Solubility Studies
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
Applied Physical Sciences (United States)
2022-2024
University of North Carolina at Chapel Hill
2022-2024
Nanyang Technological University
2019-2023
National Renewable Energy Laboratory
2023
Indian Institute of Chemical Technology
2018-2021
Pusan National University
2018-2020
Government of the Republic of Korea
2020
Indian Institute of Technology Roorkee
2015-2018
Abstract Interstitial iodides are the most critical type of defects in perovskite solar cells that limits efficiency and stability. They can be generated during solution, film, device processing, further accelerating degradation. Herein, we find introducing a small amount zinc salt- trifluoromethane sulfonate (Zn(OOSCF 3 ) 2 solution control iodide resultant perovskites ink films. CF SOO ̶ vigorously suppresses molecular iodine formation by reducing it to iodide. At same time, cations...
Abstract Typical fabrication methods for laboratory‐scale (<1 cm 2 ) perovskite solar cells (PSCs) are undeniably not scalable and the control of crystallization large‐area layer commercial sized modules is also particularly challenging. Here, a seed‐assisted approach demonstrated through addition alkali salts, CsPbBr 3 KPb Br 5 , to precursor ink enabling homogeneous highly crystalline Cs 0.15 FA 0.85 Pb(I 0.83 0.17 (CsFA) films via slot‐die coating technique. X‐ray photoelectron...
The power conversion efficiency (PCE) of the state-of-the-art large-area slot-die-coated perovskite solar cells (PSCs) is now over 19%, but issues with their stability persist owing to significant intrinsic point defects and a mass surface imperfections introduced during fabrication process. Herein, utilization hydrophobic all-organic salt reported modify top methylammonium (MA)-free halide layers. Bearing two molecules, each which endowed anchoring groups capable exhibiting secondary...
A selective integration of Ni(OH)<sub>2</sub> NNAs@NiO–NiCo<sub>2</sub>O<sub>4</sub> NSAs was rationally designed and directly utilized as a binder-free flexible electrode for hybrid SCs with excellent energy density.
Extending halide perovskites' optoelectronic properties to stimuli-responsive chromism enables switchable optoelectronics, information display, and smart window applications. Here, we demonstrate a band gap tunability (chromism) via crystal structure transformation from three-dimensional FAPbBr3 ⟨110⟩ oriented FAn+2PbnBr3n+2 using mono-halide/cation composition (FA/Pb) tuning. Furthermore, illustrate reversible photochromism in perovskite by modulating the intermediate n phase structure,...
Perovskite solar cells (PSCs) are promising to reduce the cost of photovoltaic system due their low-cost raw materials and high-throughput solution process; however, fabrication all active layers in perovskite modules using a scalable process has not yet been demonstrated. Herein, highly efficient PSCs ambient conditions is reported, with bladed except metal electrode, by blading 36 ± 9 nm-thick electron-transport layer (ETL) on films roughness ≈80 nm. A combination additives phenyl-C61...
Abstract Organolead halide perovskites have attracted much interest from the scientific community in past four years towards potential photovoltaic applications. A record efficiency of 20.1 % was reported 2014. Some variation is observed when hole‐transporting material (HTM) used perovskite solar cells (PSCs) altered. This Review emphasizes importance HTMs as a means to elevate already superior device performance new status. basic introduction materials for photovoltaics first provided....
We report synthetic steps towards a lead free manganese based perovskite MAPb<sub>x</sub>Mn<sub>1–x</sub>I<sub>1+2x</sub>Cl<sub>2–2x</sub>. Fabrication of cell with an inverted planar architecture at low processing temperatures shows its potential application in future solar cells.
Hierarchical MnCo<sub>2</sub>O<sub>4</sub>–NiCo<sub>2</sub>O<sub>4</sub> nanostructures deliver a higher electrochemical performance than MnCo<sub>2</sub>O<sub>4</sub> and NiCo<sub>2</sub>O<sub>4</sub> electrodes.
Developing metal–halide perovskite nanocrystals (NCs) has attracted great interest due to its potential application in optoelectronic devices. Herein, for the first time we report facile synthesis of Fe3+-doped cesium lead chloride (CsPbCl3) NCs along with their exciton relaxation dynamics. Efficient energy transfer occurs from host Fe3+ dopant, leading pink-colored dual emission consisting blue CsPbCl3 exitonic peak (410 nm) and red Fe-dopant state (584 nm). Interestingly, Fe-doping is...
Halide perovskites have been of great interest for light-emitting diodes (PeLEDs) in recent years because their excellent photo- and electroluminescence properties. However, traps/defects ion migration devices under high external driving voltage or current are yet to be overcome. In this work, it is found that upon potassium (K) addition a CsPbBr3/Cs4PbBr6 (3D:0D = 0.85:0.15) perovskite, locally disordered 0D Cs4–xKxPbBr6 phase formed with nearly 0.35:0.65 admixture 0D:3D, along an unreacted...
A nanocube of Ni-doped CsPbBr3nanocrystals (NCs) has been successfully synthesized and characterized by various spectroscopy techniques such as High-resolution transmission electron microscopy (HR-TEM), field emission scanning (FE-SEM), X-ray photoelectron (XPS), etc. The optoelectronic properties NCs have investigated with different solvents. HR-TEM FE-SEM reveal that the obtained CsPbBr3NCs exhibit cubic-rectangular morphologies sizes. Furthermore, radiative exciton kinetics was examined...
Herein, electroluminescence (EL) and thermal imaging are used to examine p–i–n metal halide perovskite (MHP) photovoltaic (PV) mini‐modules (MA 0.6 FA 0.4 PbI 3 , 20 cells, 78 cm 2 ) before after indoor‐accelerated stress testing or outdoor deployment. Distinct spatial patterns in the EL images emerge, which depend on external conditions experienced by mini‐module. Imaging results highlight a distribution of dark speckle features that dominate UV stress, attributed widespread interfacial...
Schematic illustration of the two-step synthesis MgCo<sub>2</sub>O<sub>4</sub>/MgCo<sub>2</sub>O<sub>4</sub> directly grown on Ni foam.
Hollow fluorescent carbon nanoparticle and solid were synthesised separately from<italic>Syzygium cumini</italic>extract<italic>via</italic>a self-catalysis method in large scale for commercialization without providing any external heat. The nanoparticles charaterized their applications studied.
Developing efficient and stable perovskite solar cells (PSCs) in open atmosphere desperately requires robust hole-transporting material (HTMs) with high hole conductivity rich hydrophobicity. Here, we present two dopant-free, highly hydrophobic, donor−π–acceptor conducting polymeric HTMs by interconnecting three monomer units of 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene, pyrrolo[3,4-c]pyrrole-1,3-dione,...
A two-dimensional hybrid coordination polymer [Pb(CH3NH2)I2]n featuring a well-defined layered structure is reported for scalable perovskite ink and deposition. This exhibits structural, spectroscopic, physicochemical properties distinct from common PbI2 precursors. Notably, it serves as methylamine "gas carrier" capable of liberating (CH3NH2) into the precursor solution, thus improving solubility in unconventional, greener processing solvents, such acetonitrile. The purity single crystals...
Developing organic molecules as light harvesters is the key for transparent solar cells technologies. In this paper, we have designed and synthesized a novel metal-free near-infrared (NIR) panchromatic asymmetrical squaraine sensitizers (SQ-SPS) with thieno[3,2-b]thiophene (TT) unit π-spacer, dicyanovinyl cyanoacrylic acid acceptor successfully used sensitizer dye-sensitized (DSSCs) application. We adopted C–H arylation protocol to achieve final target molecule which allows avoid...
Surface passivation has been proven to be an effective strategy improve power conversion efficiency and stability of perovskite solar cells. However, the rationale for choosing appropriate passivator, in terms type interaction with underlying layer, is still not clear yet. Here, we purposively choose two molecules as passivators perovskites, fluorinated phosphonic acid its corresponding phosphonate salt, monitor extent between these surface. The effect on film device performance also...