SEARCH · Engineering Papers
Results for “halide perovskite”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Tunable Interlayer Delocalization of Excitons in Layered Organic–Inorganic Halide Perovskites
Not Available
Lattice Distortion and Low-Frequency Anharmonic Phonons Suppress Charge Recombination in Lead Halide Perovskites upon Pseudohalide Doping: Time-Domain Ab Initio Analysis
Not Available
Thermal Decoherence of Superradiance in Lead Halide Perovskite Nanocrystal Superlattices
Recent experiments by Rainò et al. have documented cooperative emission from CsPbBr 3 nanocrystal superlattices, exhibiting the hallmarks of low-temperature superradiance. In particular, the optical response is coherent and the radiative decay rate is increased by a factor of 3, relative to that of individual nanocrystals. However, the increase is 6 orders of magnitude smaller than what is theoretically expected from the superradiance of large assemblies, consisting of 10 6 –10 8 interacting nanocrystals. In this report we develop a theoretical model of superradiance for such systems and show that thermal decoherence is largely responsible for the drastic reduction of the radiative decay rate in nanocrystal superlattices. Our theoretical approach explains the experimental results, provides insight into the design of small nanocrystal superlattices, and shows a 4 orders of magnitude enhancement in superradiant response. These quantitative predictions pave the path toward observing superradiance at higher temperatures.
A New Perspective and Design Principle for Halide Perovskites: Ionic Octahedron Network (ION)
Explore the source record for details and available documents.
Dielectric Screening and Charge-Transfer in 2D Lead-Halide Perovskites for Reduced Exciton Binding Energies
Not Available
Spatially Resolved Anion Diffusion and Tunable Waveguides in Bismuth Halide Perovskites
Not provided.
Dynamics of Antisolvent Processed Hybrid Metal Halide Perovskites Studied by In Situ Photoluminescence and Its Influence on Optoelectronic Properties
Explore the source record for details and available documents.
Relationship between the Nature of Monovalent Cations and Charge Recombination in Metal Halide Perovskites
We report charge recombination rates in lead iodide perovskites with alloys of formamidinium (FA) and methylammonium (MA) cations, FA x MA 1–x PbI 3 , 0 ≤ x ≤ 0.9, prepared through ion exchange with minimal differences in morphology and charge trap density. Our results show that the trap-mediated recombination rate increases over 2 orders of magnitude with decreasing MA content. These results are consistent with a proposed mechanism that MA molecules are more effective in screening charged defects. In contrast, band-to-band charge recombination rates are minimized at an intermediate alloy composition. Here, these findings reveal that the monovalent cations impact recombination processes through different mechanisms.