Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells
Main Author: | |
---|---|
Language: | English |
Published: |
Bowling Green State University / OhioLINK
2020
|
Subjects: | |
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 |