A5024483054- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Catalytic Processes in Materials Science
- Solid-state spectroscopy and crystallography
- Organic Light-Emitting Diodes Research
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Organic Electronics and Photovoltaics
- Catalysis and Oxidation Reactions
- ZnO doping and properties
- Electrocatalysts for Energy Conversion
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Technologies Research
- nanoparticles nucleation surface interactions
- Semiconductor materials and devices
- Ga2O3 and related materials
- Advanced battery technologies research
- Copper-based nanomaterials and applications
- Nanomaterials for catalytic reactions
- Advanced Chemical Physics Studies
- Optical properties and cooling technologies in crystalline materials
- Electronic and Structural Properties of Oxides
- 2D Materials and Applications
Okinawa Institute of Science and Technology Graduate University
2015-2024
University of Central Florida
2006-2021
Aarhus University
2012-2015
Yeshiva University
2010
University of Pittsburgh
2010
Technical University of Moldova
2010
Materials Processing (United States)
2010
Kyoto University
2005
Universidade de São Paulo
2002-2003
Key insights into the evolution of lithium-ion batteries: present, future, and hybridized technologies.
Although β-CsPbI3 has a bandgap favorable for application in tandem solar cells, depositing and stabilizing experimentally remained challenge. We obtained highly crystalline films with an extended spectral response enhanced phase stability. Synchrotron-based x-ray scattering revealed the presence of oriented grains, sensitive elemental analyses-including inductively coupled plasma mass spectrometry time-of-flight secondary ion spectrometry-confirmed their all-inorganic composition. further...
Silver is a low‐cost candidate electrode material for perovskite solar cells. However, in such cells the silver electrodes turn yellow within days of device fabrication. The color change also accompanied by dramatic decrease power conversion efficiency when compared to otherwise identical devices using gold electrodes. Here, it shown that results from oxidation iodide, due reaction with iodine methyl ammonium lead perovskite. X‐ray diffraction and photoelectron spectroscopy discussed....
Thermal gravimetric and differential thermal analysis (TG-DTA) coupled with quadrupole mass spectrometry (MS) first principles calculations were employed to elucidate the chemical nature of released gases during decomposition CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>.
There has been an urgent need to eliminate toxic lead from the prevailing halide perovskite solar cells (PSCs), but current lead-free PSCs are still plagued with critical issues of low efficiency and poor stability. This is primarily due their inadequate photovoltaic properties chemical Herein we demonstrate use lead-free, all-inorganic cesium tin-germanium triiodide (CsSn0.5Ge0.5I3) solid-solution as light absorber in PSCs, delivering promising up 7.11%. More importantly, these show very...
Strategies of how to mitigate photodegradation and thermal degradation processes are proposed in this work order further improve operational stability hybrid perovskite solar cells.
Organic-inorganic halide perovskite materials (e.g., MAPbI3, FAPbI3, etc.; where MA = CH3NH3+, FA CH(NH2)2+) have been studied intensively for photovoltaic applications. Major concerns the commercialization of technology to take off include lead toxicity, long-term stability, hysteresis, and optimal bandgap. Therefore, there is still need further exploration alternative candidates. Elemental composition engineering MAPbI3 FAPbI3 has proposed address above concerns. Among best six certified...
Suppressing nucleation over large areas Although formamidinium-based lead iodide (PbI 2 ) perovskites have a favorable bandgap and good thermal stability, the difficulty in controlling makes it difficult to grow high-quality, large-area films compared with methylammonium counterparts. Bu et al. show that adding N -methyl-2-pyrrolidone perovskite precursors forms an adduct PbI promotes formation of desired black α-phase at room temperature. The addition potassium hexafluorophosphate...
Tailoring the chemical reactivity of nanomaterials at atomic level is one most important challenges in catalysis research. In order to achieve this elusive goal, fundamental understanding geometric and electronic structure these complex systems must be obtained. This article reports influence nanoparticle shape on Pt nanocatalysts supported γ-Al(2)O(3). Nanoparticles with analogous average size distributions (∼0.8-1 nm), but different shapes, synthesized by inverse micelle encapsulation,...
Abstract 2,2′,7,7′‐tetrakis‐(N,N‐di‐4‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐MeOTAD) hole transport material (HTM) is a milestone in the history of perovskite solar cells (PSCs). Proper choice HTMs key factor for efficient charge extraction and stability cells. Spiro‐MeOTAD proven to be most suitable HTM testing PSCs due its facile implementation high performance. Similarly, spiro‐MeOTAD receiving attention other applications than desirable properties. However, under debate...
Doping properties of 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-MeOTAD) hole transport layer are investigated by X-ray photoelectron spectroscopy, ultraviolet and atomic force microscopy under air exposure. XPS results reveal that 3 h exposure Li-bis(trifluoromethanesulfonyl)-imide (LiTFSI) doped spiro-MeOTAD to in the migration LiTFSI from bottom top across film. AFM images presence pinholes with an average diameter ∼135 nm a density ∼3.72 holes/μm2. In...
Organometal halide based perovskites are promising materials for solar cell applications and rapidly developing with current devices reaching ∼19% efficiency. In this work we introduce a new method of perovskite synthesis by hybrid chemical vapor deposition (HCVD), demonstrate efficiencies as high 11.8%. These cells were found to be stable time, retained almost the same efficiency after approximately 1100 h storage in dry N2 gas. This is particularly attractive because its ability scale up...
Abstract In this work all‐inorganic perovskite CsPbIBr 2 are doped with Mn to compensate their shortcomings in band structure for the application of solar cells (PSCs). The novel Mn‐doped perovskites, CsPb 1− x I 1+2 Br 2−2 , prepared ambient atmosphere. As concentration 2+ ions increases, bandgaps decrease from 1.89 1.75 eV. Additionally, when dopants is appropriate, film shows better crystallinity and morphology than its undoped counterpart. These advantages alleviate energy loss hole...
When transferring photovoltaic technologies from laboratory-scale fabrication to industrial applications, low cost, large area, high throughput, solar-to-energy power conversion efficiency, long lifetime, and toxicity are crucial attributes. In recent years, organic–inorganic halide perovskite solar cells have emerged as a promising high-performance, cost-effective cell technology. However, most of the best reported efficiencies been obtained on small active-area devices (∼0.1 cm2)....
Abstract In the past decade, efficiency of perovskite solar cells quickly increased from 3.8% to 25.2%. The quality films plays vital role in device performance. fabricated by solution‐process are usually polycrystalline, with significantly higher defect density than that single crystal. One kind is uncoordinated Pb 2+ , which generated during thermal annealing process due volatile organic component. Another detrimental 0 often observed film fabrication or cell operation. Because open...
Efficient and stable parallel perovskite solar module is achieved by slot-die coating.
Vapor based methods provide a promising alternative way to fabricate organometal halide perovskite solar cells.
Lightweight and flexible energy storage devices are urgently needed to persistently power wearable devices, lithium-sulfur batteries promising technologies due their low mass densities high theoretical capacities. Here we report a high-energy full battery device with only 100% oversized lithium, enabled by rationally designed copper-coated nickel-coated carbon fabrics as excellent hosts for lithium sulfur, respectively. These metallic endow mechanical flexibility, reduce local current...
Perovskite solar cells (PSCs) have attracted great attention in the past few years due to their rapid increase efficiency and low-cost fabrication. However, instability against thermal stress humidity is a big issue hindering commercialization practical applications. Here, by combining thermally stable formamidinium-cesium-based perovskite moisture-resistant carbon electrode, successful fabrication of PSCs reported, which maintain on average 77% initial value after being aged for 192 h under...