A5000539230- Perovskite Materials and Applications
- 2D Materials and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Optical properties and cooling technologies in crystalline materials
- Luminescence Properties of Advanced Materials
- Advanced Photocatalysis Techniques
- Ga2O3 and related materials
- Organic Electronics and Photovoltaics
- Advanced Sensor and Energy Harvesting Materials
- Coral and Marine Ecosystems Studies
- Solid-state spectroscopy and crystallography
- Semiconductor Quantum Structures and Devices
Purdue University West Lafayette
2021-2025
Abstract Electroluminescence efficiencies and stabilities of quasi-two-dimensional halide perovskites are restricted by the formation multiple-quantum-well structures with broad uncontrollable phase distributions. Here, we report a ligand design strategy to substantially suppress diffusion-limited disproportionation, thereby enabling better control. We demonstrate that extending π-conjugation length increasing cross-sectional area enables perovskite thin films dramatically suppressed ion...
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...
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...
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...
Tin-based two-dimensional (2D) perovskites are emerging as lead-free alternatives in halide perovskite materials, yet their exciton dynamics and transport remain less understood due to defect scattering. Addressing this, we employed temperature-dependent transient photoluminescence (PL) microscopy investigate intrinsic three structurally analogous Sn- Pb-based 2D perovskites. Employing conjugated ligands, synthesized high-quality crystals with enhanced phase stability at various...
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...
Abstract 2D perovskite (PVSK) single crystals have received significant attention due to their unique optical and optoelectronic properties. However, current synthesis methods face limitations, particularly in large‐area fabrication, which remain critical barriers practical applications. In this study, the of red/green/purple‐blue‐colored PVSK nanocrystals over a large area (4‐inch wafer) fabrication high‐performance photodetector arrays are presented via facile yet efficient spray‐coating...
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...
Commercialization of halide perovskites in the semiconductor industry is hindered by their short-term stability. The instability closely interlinked with ionic diffusion. Historically, attempts to study diffusion 2D mostly utilized electrical characterizations, but these characterizations pose a challenge deconvoluting impact device architecture, interlayers, and species. In this Perspective, we focus our attention on simple optical employed literature investigate using lateral vertical...
Abstract Metal halide perovskites have witnessed great success in green, red, and near‐infrared light‐emitting diodes (LEDs), yet blue LEDs still lag behind. Reducing undesired energetic disorders – broad n ‐phases segregation is considered as the most critical strategy to further improve performances. Here, study reports a newly designed synthesized di‐ammonium ligand with rigid π ‐conjugated rings additional methyl groups construct Dion–Jacobson (DJ) structure. Augmented coordination from...
Two-dimensional (2D) perovskites have gained much attention lately owing to their excellent optoelectronic properties, chemical tunability, and environmental stability. Multiple methods been devised synthesize high quality 2D perovskite single crystals, recent progress in fabricating its heterostructures is notable as well. In particular, with growing interest van der Waals heterostructures, become a strong candidate new building block for reveal unique physical properties across different...
Photoinduced interfacial charge transfer plays a critical role in energy conversion involving van der Waals (vdW) heterostructures constructed of inorganic nanostructures and organic materials. However, the effect molecular stacking configurations on dynamics is less understood. In this study, we demonstrated tunability separation type-II heterojunction between monolayer (ML) WS2 an semiconducting molecule [2-(3″′,4′-dimethyl-[2,2′:5′,2′:5″,2″′-quaterthiophen]-5-yl)ethan-1-ammonium halide...
The synthesis of extremely thin 2D halide perovskites and the exploration their interlayer interactions have garnered significant attention in current research. A recent advancement we made involves development a successful technique for generating ultrathin MAPbI
Abstract Metal halide perovskites show promise for next-generation light-emitting diodes, particularly in the near-infrared range, where they outperform organic and quantum-dot counterparts. However, still fall short of costly III-V semiconductor devices, which achieve external quantum efficiencies above 30% with high brightness. Among several factors, controlling grain growth nanoscale morphology is crucial further enhancing device performance. This study presents a engineering methodology...