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Spatiotemporal Carrier Dynamics of M...

Malizia, Jason Patrick.

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Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy./
Author:	Malizia, Jason Patrick.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	127 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
Subject:	Physical chemistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28490025
ISBN:	9798535598130

Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy.
Malizia, Jason Patrick.

Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 127 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2021.

.

Prompted by emerging nanotechnologies, semiconductor nanostructures have been studied by a wide range of optical time-resolved experiments. However, most time-resolved spectroscopies lack spatial resolution and average the excited state dynamics over multiple nanostructures, as well as the heterogeneity present in individual structures. Here, the sub-picosecond temporal resolution of the pump-probe technique is combined with a diffraction-limited light microscope to resolve the ultrafast dynamics of both single MoS2 nanoflakes and individual structural features (such as edges, tears, and steps) present within those structures. The MoS2 nanoflakes studied are ~20 nm thick and a few microns across. Excitation with a 425 nm pump promotes electrons across the band gap at a localized point in a single structure. Monitoring the changes in the intensity of a transmitted 850 nm probe reveals two distinct photoexcited species in the lattice: short lived excitons that decay via exciton-exciton annihilation and long lived free-carriers that decay through traps. The imaging capabilities of the microscope resolve differences in the kinetics at the edges of the MoS2 nanoflakes compared to that of the basal plane. Pump-probe images of individual nanoflakes also reveal a periodic fringe pattern that is most intense at the edge of the flake and decays in amplitude towards the flake's interior. The fringes result from exciton-polariton formation, whereby the probe light couples to excitons formed by pump excitation to form exciton-polaritons.

ISBN: 9798535598130Subjects--Topical Terms:

1981412
Physical chemistry.
Subjects--Index Terms:

Carrier dynamics

Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy.
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245 1 0 $a Spatiotemporal Carrier Dynamics of Molybdenum Disulfide Nanoflakes: A Detailed Investigation Using Pump-Probe Microscopy.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 127 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
500 $a Advisor: Papanikolas, John M.
502 $a Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2021.
506 $a .
520 $a Prompted by emerging nanotechnologies, semiconductor nanostructures have been studied by a wide range of optical time-resolved experiments. However, most time-resolved spectroscopies lack spatial resolution and average the excited state dynamics over multiple nanostructures, as well as the heterogeneity present in individual structures. Here, the sub-picosecond temporal resolution of the pump-probe technique is combined with a diffraction-limited light microscope to resolve the ultrafast dynamics of both single MoS2 nanoflakes and individual structural features (such as edges, tears, and steps) present within those structures. The MoS2 nanoflakes studied are ~20 nm thick and a few microns across. Excitation with a 425 nm pump promotes electrons across the band gap at a localized point in a single structure. Monitoring the changes in the intensity of a transmitted 850 nm probe reveals two distinct photoexcited species in the lattice: short lived excitons that decay via exciton-exciton annihilation and long lived free-carriers that decay through traps. The imaging capabilities of the microscope resolve differences in the kinetics at the edges of the MoS2 nanoflakes compared to that of the basal plane. Pump-probe images of individual nanoflakes also reveal a periodic fringe pattern that is most intense at the edge of the flake and decays in amplitude towards the flake's interior. The fringes result from exciton-polariton formation, whereby the probe light couples to excitons formed by pump excitation to form exciton-polaritons.
590 $a School code: 0153.
650 4 $a Physical chemistry. $3 1981412
650 4 $a Materials science. $3 543314
650 4 $a Simulation. $3 644748
650 4 $a Spectrum analysis. $3 520440
650 4 $a Semiconductors. $3 516162
650 4 $a Lasers. $3 535503
650 4 $a Experiments. $3 525909
650 4 $a Molybdenum. $3 3681682
650 4 $a Electric fields. $3 880423
650 4 $a Equilibrium. $3 668417
650 4 $a Microscopy. $3 540544
650 4 $a Hydrogen. $3 580023
650 4 $a Oscillators. $3 3681675
650 4 $a Optical properties. $3 3560260
650 4 $a Energy. $3 876794
650 4 $a Light. $3 524021
650 4 $a Morphology. $3 591167
650 4 $a Interfaces. $2 gtt $3 834756
653 $a Carrier dynamics
653 $a Microscopy
653 $a MoS2
653 $a Pump-probe
653 $a Ultrafast
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690 $a 0794
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