A5034383457- Perovskite Materials and Applications
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Quantum Dots Synthesis And Properties
- Photonic Crystals and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced Photocatalysis Techniques
- Electronic and Structural Properties of Oxides
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- 2D Materials and Applications
- Plasmonic and Surface Plasmon Research
- Advanced Battery Materials and Technologies
- Transition Metal Oxide Nanomaterials
Princeton University
2020-2025
University of Maryland, College Park
2018
Accessing vertical orientation of two-dimensional (2D) perovskite films is key to achieving high-performance solar cells with these materials. Herein, we report on solvent-vapor annealing (SVA) as a general postdeposition strategy induce strong across broad classes 2D films. We do not observe any local compositional drifts that would result in impure phases during SVA. Instead, our experiments point solvent vapor plasticizing and facilitating their surface-induced reorientation concomitant...
Abstract 2D Ruddlesden–Popper metal‐halide perovskites exhibit structural diversity due to a variety of choices organic ligands. Incorporating bifunctional ligands in such materials is particularly intriguing since it can result novel electronic properties and functions. However, an in‐depth understanding the effects on perovskite structures and, consequently, their excitonic properties, still lacking. Here, n = 1 built with containing ─CN, ─OH, ─COOH, ─phenyl (Ph), ─CH 3 functional groups...
The use of 2D perovskite capping layers to passivate the surface defects 3D active has become ubiquitous in high performance lead halide solar cells. However, these 2D/3D interfaces can be highly dynamic, with structure evolving form various mixed dimensional phases when exposed thermal stress or illumination. Changes photoluminescence spectrum formamidinium iodide (FAPbI3) films capped alkylammonium-based perovskites as they age at 100 °C under simulated 1 sun illumination indicate that...
Abstract Surface plasmon polaritons (SPPs) enable the deep subwavelength confinement of an electromagnetic field, which can be used in optical devices ranging from sensors to nanoscale lasers. However, limited number metals that satisfy required boundary conditions for SPP propagation a metal/dielectric interface severely limits its occurrence visible range spectrum. We introduce strategy engineering band structure metallic materials by alloying. experimentally and theoretically establish...
Perovskite CsPbI3 is a promising photovoltaic absorber material, thanks to its ideal bandgap for Si-tandem solar cell applications and excellent thermochemical stability compared with hybrid organic–inorganic perovskites. However, has own challenges as photoactive β- γ-polymorphs are thermodynamically unstable at room temperature the yellow non-perovskite δ-phase. Stabilizing has, thus, been subject of considerable research in recent years. While some approaches, such alloying halides...
Abstract 2D hybrid organic–inorganic perovskites are potentially promising materials as passivation layers that can enhance the efficiency and stability of perovskite photovoltaics. The ability to suppress ion transport is proposed a stabilization mechanism, yet an effective characterization relevant modes halide diffusion in nascent. In light this knowledge gap, molecular dynamics simulations with enhanced sampling experimental validation systematically characterize how ligand chemistry...
Two-dimensional (2D) hybrid organic-inorganic perovskites are potentially promising materials as passivation layers that can enhance the efficiency and stability of perovskite photovoltaics. The ability to suppress ion transport has been proposed a stabilization mechanism, yet effective characterization relevant modes halide diffusion in 2D is nascent. In light this knowledge gap, we combine molecular dynamics simulations with enhanced sampling experimental validation systematically...
Two-dimensional (2D) hybrid organic-inorganic perovskites are potentially promising materials as passivation layers that can enhance the efficiency and stability of perovskite photovoltaics. The ability to suppress ion transport has been proposed a stabilization mechanism, yet effective characterization relevant modes halide diffusion in 2D is nascent. In light this knowledge gap, we combine molecular dynamics simulations with enhanced sampling experimental validation systematically...
Two-dimensional (2D) hybrid organic-inorganic perovskites are potentially promising materials as passivation layers that can enhance the efficiency and stability of perovskite photovoltaics. The ability to suppress ion transport has been proposed a stabilization mechanism, yet effective characterization relevant modes halide diffusion in 2D is nascent. In light this knowledge gap, we combine molecular dynamics simulations with enhanced sampling experimental validation systematically...
Marina S. Leite and co-workers (article number 1800218) demonstrate the alloying of Ag Au for band structure engineering. The tunability optical dispersion relation is measured by reflectivity valence spectra. calculations corroborate experiments, while elucidating energy shift interband transitions. image represents measurements in Ag–Au system.
Thermal evaporation is a promising technique for the fabrication of uniform perovskite films over large areas that forgo use hazardous solvents. However, equipment, particularly at laboratory scale, often shared between different materials systems and it is, thus, important to understand potential impact halide can have on other devices processed in same chamber. Here, we observe precursors such as PbI2 CsI results significant iodine contamination not efficiently removed by conventional...