Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells

Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells

Bibliographic Details
Main Author: Harankahage, Dulanjan Padmajith Dharmasena
Language:English
Published: Bowling Green State University / OhioLINK 2020
Subjects:
Physics
Materials Science
catalysis
photovoltaics
nanocrystals
biexcitons
lasing
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583
id ndltd-OhioLink-oai-etd.ohiolink.edu-bgsu1593955468720583
record_format oai_dc
spelling ndltd-OhioLink-oai-etd.ohiolink.edu-bgsu15939554687205832021-08-15T09:57:36Z Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells Harankahage, Dulanjan Padmajith Dharmasena Physics Materials Science catalysis photovoltaics nanocrystals biexcitons lasing Multiple exciton (MX) generation has been a significant part of the success of many semiconductor applications such as photoinduced energy conversion, stimulated emission and carrier multiplication. Generally, in small size semiconductor nanocrystals, MX processes are enhanced through quantum confinement of photoinduced charges. Unfortunately, the small particle volume of these semiconductor nanocrystals can also drive non-radiative Auger decay of multiple excitons reducing the MX feasibility in nanocrystal-based laser, photovoltaic and photoelectrochemical devices. Here, we reveal such Auger decay of biexcitons can be restrained with the utilization of quantum-well (QW) nanoshell heterostructures. The reported architecture reduces the Coulomb interactions between photoinduced charges which leads to enhanced biexciton lifetimes. Transient absorption measurements were used to demonstrate the increased biexciton lifetimes which revealed the cadmium based QW nanoshells (CdS/CdSe/CdS) increased the biexciton lifetime by more than 30 times compared to zero-dimensional CdSe nanocrystals. Suppression of Auger decay was attributed to the substantial confinement volume of the QW nanoshell architecture. 2020-08-12 English text Bowling Green State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583 http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Physics
Materials Science
catalysis
photovoltaics
nanocrystals
biexcitons
lasing
spellingShingle Physics
Materials Science
catalysis
photovoltaics
nanocrystals
biexcitons
lasing
Harankahage, Dulanjan Padmajith Dharmasena
Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
author Harankahage, Dulanjan Padmajith Dharmasena
author_facet Harankahage, Dulanjan Padmajith Dharmasena
author_sort Harankahage, Dulanjan Padmajith Dharmasena
title Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
title_short Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
title_full Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
title_fullStr Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
title_full_unstemmed Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
title_sort quantum confinement beyond the exciton bhor radius in quantum dot nanoshells
publisher Bowling Green State University / OhioLINK
publishDate 2020
url http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583
work_keys_str_mv AT harankahagedulanjanpadmajithdharmasena quantumconfinementbeyondtheexcitonbhorradiusinquantumdotnanoshells
_version_ 1719460021636431872

Similar Items