A5062057476- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Conducting polymers and applications
- Optical properties and cooling technologies in crystalline materials
- Luminescence Properties of Advanced Materials
- Organic Electronics and Photovoltaics
- Thermal Expansion and Ionic Conductivity
- Organic Light-Emitting Diodes Research
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Corrosion Behavior and Inhibition
- Transition Metal Oxide Nanomaterials
- Advanced Semiconductor Detectors and Materials
- Advanced Photocatalysis Techniques
- Chemistry and Chemical Engineering
- Ga2O3 and related materials
- Strong Light-Matter Interactions
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Dendrimers and Hyperbranched Polymers
- Fuel Cells and Related Materials
- Ferroelectric and Piezoelectric Materials
- TiO2 Photocatalysis and Solar Cells
University of Victoria
2020-2025
Oklahoma State University
2019-2022
Oklahoma State University Oklahoma City
2021-2022
University of Oklahoma
2021
Banaras Hindu University
2015-2016
Despite the well-known implications in field of III–V semiconductors, lattice strain halide perovskite materials has been largely overlooked until recently. Here, we review effect on structural, chemical, and optoelectronic properties metal perovskites to understand how engineering can be applied improve device performance. We start by arguing that perovskites, like any other semiconducting material, are not immune negative effects mismanaged strain. analyze origin—and detrimental...
Most efficient perovskite solar cells are based on polycrystalline thin films; however, substantial structural disorder and defective grain boundaries place a limit their performance. Perovskite...
Lead (Pb) in conventional perovskite solar cells (PSCs) is toxic and has to be replaced. Situated one group of the periodic table elements, tin (Sn) same valence electrons' configuration as Pb (ns2np2), promising analogous chemical properties. Hence, Sn considered a suitable replacement Pb. However, because lack lanthanide shrinkage, behaves differently: stable Pb2+ form, an oxidation state needed for structure, while tends lose all its electrons forming Sn4+. As result, PSCs based on are...
Lead-free halide light-emitting diodes (LEDs) are fabricated using nontoxic and earth-abundant CsCu2I3 with a strong yellow emission at peak wavelength of 568 nm. CsCu2I3-based host–dopant emitters formed by vacuum thermal evaporation (VTE) film codeposition process instead the commonly used solution-based deposition process. Using VTE process, extremely thin (30 nm) have successfully been dopant various organic host molecules. A bright photoluminescence quantum yield value 84.8% is achieved...
Single-crystal halide perovskites exhibit photogenerated-carriers of high mobility and long lifetime, making them excellent candidates for applications demanding thick semiconductors, such as ionizing radiation detectors, nuclear batteries, concentrated photovoltaics. However, charge collection depreciates with increasing thickness; therefore, tens to hundreds volts external bias is required extract charges from a perovskite layer, leading considerable amount dark current fast degradation...
Perovskite solar cells (PSCs) excel in achieving high open-circuit voltages (VOC) for narrow bandgaps (∼1.6 eV) but face challenges with wide-bandgap perovskites, like methylammonium lead trichloride (MAPbCl3) a 3.03 eV bandgap. These materials are transparent visible absorbing ultraviolet (UV) light. However, uniform film crystallization remains hurdle. Here, we enhance MAPbCl3 by manipulating annealing atmospheres (nitrogen, air, and MACl vapor). Excess vapor improves surface coverage,...
Abstract Formamidinium lead iodide (FAPbI 3 ) in its α‐phase is among the most desirable perovskite compositions for solar cells. However, because of transition into yellow δ‐phase at room temperature, it a challenge to process ambient air by scalable fabrication methods. Here introduction trace amount cadmium (in form CdI 2 FAPbI reported and found that enhances stability perovskite's black polymorph, inhibits non‐radiative recombination events, leads pin‐hole free compact surface...
Abstract The conventional approach to search for new materials is synthesize a limited number of candidates. However, this might delay or prevent the discovery better-performing due narrow composition space explored. Here, we fabricate binary alloy films with gradient in single shot less than one minute. We apply study stability halide perovskites. all possible compositions from MAPbI 3 and MAPbBr then their optical properties, structure, environmental high-throughput manner. find that...
Perovskite solar cells (PSCs) have exceeded 26% efficiency. One attribute of PSCs is their printability at relatively low temperatures, particularly advantageous for flexible cells. However, developing efficient, fully printable on rough and soft plastic substrates remains a challenge. Herein, efficient fabricated by only scalable methods in ambient conditions are reported. First, the source issue fabricating PSCs—the presence charge carrier shorting pathways within electron‐transport layer...
Abstract Controlling the linear growth rate, a critical factor that determines crystal quality, has been challenge in solution-grown single crystals due to complex crystallization kinetics influenced by multiple parameters. Here we introduce flux-regulated (FRC) method directly monitor and feedback-control circumventing need control individual conditions. When applied metal halide perovskites, FRC maintains stable rate for over 40 h synthesizing CH 3 NH PbBr CsPbBr crystals, achieving...
Abstract X‐ray detectors are used widely, but they suffer from short operational stability and insufficient absorptivity of photons. Here, a strategy for room‐temperature, solution‐grown δ‐CsPbI 3 monocrystalline microwires exhibiting one the highest linear absorption coefficients among known semiconductors is reported. In metal–semiconductor–metal architecture, demonstrates lowest detectable dose rates at 33.3 nGy air s −1 , enabled by its exceptionally low dark current density 12 pA mm −2...
We report the cosolvency effect of formamidinium lead triiodide (FAPbI3) in a mixture γ-butyrolactone (GBL) and 2-methoxyethanol (2ME), phenomenon where FAPbI3 shows higher solubility solvent blend than either alone. found that exhibits 10× 30% 2ME GBL alone 40% at 90 °C. This enhanced is attributed to disruption hydrogen bonding network within 2ME, allowing its hydroxyl ether groups interact more freely with solute. Leveraging this phenomenon, we grew phase-stable α-FAPbI3 thin single...
CsPbBr 3 improves the morphological and photophysical properties of FAPbI perovskite films, allowing for fabrication uniform modules in ambient air, adapted to standardized indoor light. Halide segregation is limited reversible.
α-FAPbI3 (FA = formamidinium) perovskite offers an optimal bandgap for single-junction solar cells but converts into a more thermodynamically stable photoinactive δ-polymorph at room temperature. FA- or I-site substitutional alloying stabilizes α-FAPbI3; however, it leads to compositional segregation in operational devices. Here, we stabilize single crystals through Pb-site doping with heterovalent metal–bismuth (Bi). We show that undoped has α- δ-phase half-life transition of <0.15 h, while...
Abstract Perovskite precursor inks suffer various forms of degradation, such as iodide anion oxidation and organic cation breakdown, hindering reliable perovskite solar cell manufacturing. Here we report that benzylhydrazine hydrochloride (BHC) not only retards the buildup iodine previously reported but also prevents breakdown cations. Through investigating BHC chemical reactions, elucidate protonation dehydration mechanisms, converting to harmless volatile compounds, thus preserving film...
Ambient air processing is desirable for the industrial fabrication of perovskite solar cells. Here, we show that ink containing methylammonium and formamidinium in N-methyl-2-pyrrolidone N,N-dimethylformamide, a cosolvent composition satisfies prerequisites upscaling cell fabrication, degrades within day ambient air. From 1H NMR spectroscopic analysis, find water proton exchange with facilitates aminolysis by methylamine. The addition elemental sulfur inhibits this process via sulfur–amine...
Perovskite solar cells (PSCs) are an attractive emerging photovoltaic technology due to their high‐performance while being made by low‐cost fabrication processes. The most efficient PSCs small area and nonscalable coating method in inert atmosphere, but these sizes conditions commercially irrelevant. Herein, of is reported using only scalable methods, that is, slot‐die blade all ambient air. tolerance relaxed enabled the use hydrated nonhalogenated lead source. Resurfacing strategy then...
All-organic infrared (IR)-to-visible upconversion organic light-emitting diodes (OLEDs) with an IR sensitivity up to 1100 nm were fabricated using a low-band-gap polymer as the sensitizing layer. A novel (1 eV) polymer, poly 4-(4,8-bis(5-(2-butyloctyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophen-2-yl)-6,7-diethyl-[1,2,5] thiadiazolo[3,4-g]quinoxaline (PBDTT-BTQ), strong photoresponse in near-IR wavelengths of 700–1100 was first synthesized thiadiazolo[3,4]quinoxaline (BTQ) and...