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Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells

Harankahage, Dulanjan Padmajith Dharmasena
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583

Abstract Details

2020, Master of Science (MS), Bowling Green State University, Physics.
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.
Mikhail Zamkov, Prof. (Advisor)
Marco Nardone, Prof. (Committee Member)
Alexey Zayak, Prof. (Committee Member)
91 p.
Materials Science; Physics
catalysis; photovoltaics; nanocrystals; biexcitons; lasing

Recommended Citations

Citations

  • Harankahage, D. P. D. (2020). Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583

    APA Style (7th edition)

  • Harankahage, Dulanjan. Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells. 2020. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583.

    MLA Style (8th edition)

  • Harankahage, Dulanjan. "Quantum Confinement Beyond the Exciton Bhor Radius in Quantum Dot Nanoshells." Master's thesis, Bowling Green State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593955468720583

    Chicago Manual of Style (17th edition)

bgsu1593955468720583
185
© 2020, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.