A5054740710- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Optical properties and cooling technologies in crystalline materials
- Catalytic Cross-Coupling Reactions
- Crystallization and Solubility Studies
- Conducting polymers and applications
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Catalytic C–H Functionalization Methods
- Covalent Organic Framework Applications
- Thermal Expansion and Ionic Conductivity
- Microwave Engineering and Waveguides
- Sulfur-Based Synthesis Techniques
- Organic Electronics and Photovoltaics
- Antenna Design and Analysis
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Terahertz technology and applications
- Luminescence Properties of Advanced Materials
- Quantum optics and atomic interactions
- Microwave Dielectric Ceramics Synthesis
Purdue University West Lafayette
2022-2024
Brown University
2018-2023
John Brown University
2018-2020
Providence College
2018-2020
Peking University
1997-2018
Zhejiang University of Technology
2016
Beijing National Laboratory for Molecular Sciences
2016
University of Electronic Science and Technology of China
2008
Lead-free double perovskite nanocrystals (NCs) have emerged as a new category of materials that hold the potential for overcoming instability and toxicity issues lead-based counterparts. Doping chemistry represents unique avenue toward tuning optimizing intrinsic optical electronic properties semiconductor materials. In this study, we report first example doping Yb3+ ions into lead-free Cs2AgBiX6 (X = Cl-, Br-) NCs via hot injection method. The endows with newly near-infrared emission band...
Morphology control represents an important strategy for the development of functional nanomaterials and has yet to be achieved in case promising lead-free double perovskite materials so far. In this work, high-quality Cs2AgBiX6 (X = Cl, Br, I) two-dimensional nanoplatelets were synthesized through a newly developed synthetic procedure. By analyzing optical, morphological, structural evolutions samples during synthesis, we elucidated that growth mechanism followed lateral process from...
Concerns about the toxicity of lead-based perovskites have aroused great interest for development alternative lead-free perovskite-type materials. Recently, theoretical calculations predict that Pb2+ cations can be substituted by a combination Cu2+ and Sb3+ to form vacancy-ordered layered double perovskite structure with superior optoelectronic properties. However, accessibilities this class materials remain inadequate, hindering their practical implementations in various applications. Here,...
Abstract Doping metal ions into lead halide perovskite nanocrystals (NCs) has attracted great attention over the past few years due to emergence of novel properties relevant optoelectronic applications. Here, synthesis Mn 2+ /Yb 3+ codoped CsPbCl 3 NCs through a hot‐injection technique is reported. The resulting show unique triple‐wavelength emission covering ultraviolet/blue, visible, and near‐infrared regions. By optimizing dopant concentrations, total photoluminescence quantum yield (PL...
Constructing two-dimensional (2D) perovskite atop of 3D with energy landscape management is still a challenge in photovoltaics. Here, we report strategy through designing series π-conjugated organic cations to construct stable 2D perovskites and realize delicate level tunability at 2D/3D heterojunctions. As result, the hole transfer barriers can be reduced both heterojunctions within structures, preferable work function shift reduces charge accumulation interface. Leveraging these insights...
Layered metal-halide perovskites, or two-dimensional can be synthesized in solution, and their optical electronic properties tuned by changing composition. We report a molecular templating method that restricted crystal growth along all crystallographic directions except for [110] promoted one-dimensional growth. Our approach is widely applicable to synthesize range of high-quality layered perovskite nanowires with large aspect ratios tunable organic-inorganic chemical compositions. These...
Abstract A heterogeneous, inexpensive, and environmentally friendly graphene oxide catalytic system for the C−H bond arylation of benzene enables formation biaryl compounds in presence aryl iodides. The oxygen functional groups these sheets addition KO t Bu are essential observed activity. Reactions with various model DFT calculations confirmed that negatively charged atoms promote overall transformation by stabilizing activating K + ions, which turns facilitates activation C−I bond....
Doped lead halide perovskite nanocrystals (NCs) have garnered significant attention due to their superior optoelectronic properties. Here, we report a synthesis of Cd-doped CsPbCl3 NCs by decoupling Pb- and Cl-precursors in hot injection method. The resulting manifest dual-wavelength emission profile with the first reported example Cd-dopant emission. By controlling concentration, can be tuned dopant quantum yield up 8%. A new secondary (∼610 nm) is induced an energy transfer process from...
The stability of formamidinium lead iodide (FAPbI3) perovskites is generally improved by incorporating cesium (Cs) into the crystal structure. However, effectiveness this approach limited intrinsically low solid-solubility Cs in bulk FAPbI3. To circumvent issue, we demonstrate a method that entails solution-deposition high-Cs-content Cs1–xFAxPbI3 alloy quantum dots (QDs) onto Cs-lean FAPbI3-based thin film. This results film with Cs-rich QD surface layer, which stabilizes against ambient...
Semiconductor quantum dots (QDs) have attracted tremendous attention in the field of photocatalysis, owing to their superior optoelectronic properties for photocatalytic reactions, including high absorption coefficients and long photogenerated carrier lifetimes. Herein, by choosing 2-(3,4-dimethoxyphenyl)-3-oxobutanenitrile as a model substrate, we demonstrate that stereoselective (>99 %) C-C oxidative coupling reaction can be realized with product yield (99 using zwitterionic ligand capped...
Lead-free double perovskites have emerged as a promising class of materials with potential to be integrated into wide range optical and optoelectronic applications. Herein, the first synthesis 2D Cs2 AgInx Bi1- x Cl6 (0 ≤ 1) alloyed perovskite nanoplatelets (NPLs) well controlled morphology composition is demonstrated. The obtained NPLs show unique properties highest photoluminescence quantum yield 40.1%. Both temperature dependent spectroscopic studies density functional theory calculation...
Quasi-2D halide perovskites have attracted much interest as a promising material for light-emitting diodes (LEDs) due to their tunability in quantum confinement and alloy formation modulate the energy bandgap emission color. However, two-factor phase separations with respect heterogeneous quantum-well thicknesses segregation are still crucial issues quasi-2D perovskite LEDs, leading low external efficiencies (EQEs) color shifts. Herein, we compare films using different cations unveil key...
Manganese-doped cesium lead chloride (CsPbCl3) perovskite nanocrystals (NCs) have recently garnered attention because of their unique magneto-optical properties, giving them potential in a variety optoelectronic applications. One common method to dope Mn2+ into host CsPbCl3 NCs is through postsynthetic ion exchange reaction. However, most strategies utilize Mn2+-containing precursor solution, which adds limitations the reaction due compatibility and stability issues. Here, we report new...
Abstract Perovskite solar cells (PSCs) have recently experienced a rapid rise in power conversion efficiency (PCE), but the prevailing PSCs with conventional mesoscopic or planar device architectures still contain nonideal perovskite/hole‐transporting‐layer (HTL) interfaces, limiting further enhancement PCE and stability. In this work, CsPbBr 3 perovskite nanowires are employed for modifying surface electronic states of bulk thin films, forming compositionally‐graded heterojunction at...
Epitaxial heterostructures of two-dimensional (2D) halide perovskites offer a new platform for studying intriguing structural, optical, and electronic properties. However, difficulties with the stability Pb- Sn-based have repeatedly slowed progress. Recently, Pb-free double are gaining lot attention due to their superior greater chemical diversity, but they not been successfully incorporated into epitaxial further investigation. Here, we report core-shell via growing (involving combinations...
Two-dimensional (2D) metal organic chalcogenides (MOCs) such as silver phenylselenolate (AgSePh) have emerged a new class of 2D materials due to their unique optical properties. However, these typically exhibit large band gaps, and elemental structural versatility remain significantly limited. In this work, we synthesize family lead chalcogenide (LOC) with excellent dimensionality tunability by designing the bonding ability molecules stereochemical activity Pb lone pair. The introduction...
Perspectives on how halide perovskite nanocrystals are better integrated in solar cells provided.
Lead-free perovskites and their analogues have been extensively studied as a class of next-generation luminescent optoelectronic materials.
Abstract Semiconductor quantum dots (QDs) have attracted tremendous attention in the field of photocatalysis, owing to their superior optoelectronic properties for photocatalytic reactions, including high absorption coefficients and long photogenerated carrier lifetimes. Herein, by choosing 2‐(3,4‐dimethoxyphenyl)‐3‐oxobutanenitrile as a model substrate, we demonstrate that stereoselective (>99 %) C−C oxidative coupling reaction can be realized with product yield (99 using zwitterionic...
Two-dimensional perovskite crystals have attracted significant attention for their diverse optoelectronic characteristics, owing to superior semiconducting properties. However, the majority of studies date focused on single crystals, which pose challenges integration into device arrays due incompatibility with selective growth or conventional lithography techniques. Here, a facile one-step solution process synthesizing 2D crystal is proposed through meniscus-guided coating patterned...