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Your search keyword '"Albert DiBenedetto"' showing total 6 results
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6 results on '"Albert DiBenedetto"'

1. Enhancing Charge Carrier Delocalization in Perovskite Quantum Dot Solids with Energetically Aligned Conjugated Capping Ligands

Author

Sue A. Carter, Evan T. Vickers, Emily E. Enlow, William Delmas, Jin Z. Zhang, Isaak N. Hernandez, Qiquan Qiao, Behzad Bahrami, Albert DiBenedetto, Benjamin W. Dreskin, Thomas A. Graham, Sayantani Ghosh, and Ashraful Haider Chowdhury

Subjects
Materials science, Renewable Energy, Sustainability and the Environment, Energy Engineering and Power Technology, Charge (physics), 02 engineering and technology, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Condensed Matter::Materials Science, Delocalized electron, Fuel Technology, Chemistry (miscellaneous), Chemical physics, Quantum dot, Materials Chemistry, Condensed Matter::Strongly Correlated Electrons, Charge carrier, 0210 nano-technology, Perovskite (structure)
Abstract

Compared to bulk perovskites, charge transport in perovskite quantum dot (PQD) solids is limited. To address this issue, energetically aligned capping ligands were used to prepare methylammonium le...

Published
2020

2. 3-Core Microstructure Optical Fiber-Based Fiber Optic Parametric Oscillator

Author

Albert DiBenedetto, Deepak Sapkota, Trevor Gammill, and Jay E. Sharping

Abstract

We report on a multi-core microstructure optical fiber-based fiber optic parametric oscillator (FOPO), the first of its kind. The FOPO has wavelength tunability over 125 nm and a pump-to-signal conversion efficiency reaching 24%.

Published
2022

3. Modulating Charge Carrier Dynamics and Transfer via Surface Modifications in Organometallic Halide Perovskite Quantum Dots

Author

William Delmas, Evan T. Vickers, Jin Z. Zhang, Sayantani Ghosh, Albert DiBenedetto, Isaak N. Hernandez, and Calista Lum

Subjects
Materials science, Exciton, Halide, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Delocalized electron, chemistry.chemical_compound, chemistry, Chemical physics, Quantum dot, General Materials Science, Charge carrier, Physical and Theoretical Chemistry, 0210 nano-technology, Benzoic acid, Doppler broadening, Perovskite (structure)
Abstract

We investigate the effect of functionalization by acid/amine combinations of four aromatic capping ligands on the optoelectronic properties of CH3NH3PbBr3 perovskite quantum dots (PQDs). These include benzoic acid (BA), phenylacetic acid (PAA), benzylamine, and isopropyl benzylamine. We observe that charge transfer efficiency in PQD films comprising BA-ligated samples varies between 12% and 95% as the dot density is tuned from 102 to 105 dots/μm2 but is consistently ∼92% over that entire range for PAA-ligated PQDs. As temperature T decreases, initially, recombination is dominated by bound or trapped excitons, but below 80 K, spectral broadening, accompanied by free excitonic behavior, is observed. Our results indicate enhanced charge delocalization at lower values of T, which reduces the level of exciton confinement and recombination decay rates and underlines the importance of investigating PQD-ligand interactions at a fundamental level given the significant effect minute changes in ligand structures have on the optoelectronic properties of quantum dots.

Published
2020

4. High Efficiency Luminescent Solar Concentrator based on Organo‐Metal Halide Perovskite Quantum Dots with Plasmon Enhancement

Author

Katerina Nikolaidou, Jin Z. Zhang, Evan T. Vickers, William Delmas, Benaz Mendewala, Sayantani Ghosh, and Albert DiBenedetto

Subjects
Materials science, business.industry, Luminescent solar concentrator, Halide, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Metal, Quantum dot, visual_art, visual_art.visual_art_medium, Optoelectronics, business, Plasmon, Perovskite (structure)
Published
2021

5. Electronic properties of edge-terminated zigzag hexagonal boron nitride nanoribbons

Author

Albert DiBenedetto and Mahfuza Khatun

Subjects
Materials science, Acoustics and Ultrasonics, Condensed matter physics, Band gap, Hexagonal boron nitride, 02 engineering and technology, Edge (geometry), 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Zigzag, Modulation, 0103 physical sciences, Density of states, 010306 general physics, 0210 nano-technology, Electronic band structure, Electronic properties
Published
2018

6. Electronic properties of edge-terminated zigzag hexagonal boron nitride nanoribbons.

Author

Albert DiBenedetto and Mahfuza Khatun

Subjects
*BORON nitride, *ELECTRONIC band structure, *DENSITY of states
Abstract

The electronic properties of edge-terminated zigzag hexagonal boron nitride nanoribbons (ZBNNRs) are studied with a tight-binding model which utilizes extended Hückel theory. The nanoribbons are terminated with F, Cl, O, S and P atoms, respectively. In all cases, the energy band structure and density of states are studied. Band properties and band gaps for each system are also reported. It is found that F and Cl atoms produce semiconducting properties when used as terminating atoms to the ZBNNRs and O, S and P atoms produce metallic properties when used as terminating atoms. The addition of the terminating atoms changes localized edge states and creates new ones, the effects of which can be seen across all available bonding orbitals. [ABSTRACT FROM AUTHOR]

Published
2019
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