Nonradiative decay of singlet excitons in cadmium selenide nanoparticles
| dc.contributor.advisor | Rossky, Peter J. | |
| dc.creator | Anderson, Kevin David | en |
| dc.date.accessioned | 2014-09-23T19:07:59Z | en |
| dc.date.accessioned | 2018-01-22T22:26:36Z | |
| dc.date.available | 2018-01-22T22:26:36Z | |
| dc.date.issued | 2014-08 | en |
| dc.date.submitted | August 2014 | en |
| dc.date.updated | 2014-09-23T19:07:59Z | en |
| dc.description | text | en |
| dc.description.abstract | Nonradiative decay of excitons is a competing process to Multi-Exciton Generation (MEG) in nanoparticles. Nonradiative decay of single excitons with sufficient energy to generate bi-excitons in Cd₂₀ Se₁₉ and Cd₈₃ Se₈₁ nanoparticles was studied using Tully's Molecular Dynamics with Quantum Transitions (MDQT) method and a CdSe pseudopo- tential. Exciton decay rates increase with increases in nanoparticle temperature and density of lower-lying excitonic states. There did not appear a significant effect of size on energy decay rates. The decay dynamics generally follow a gradual decay with transitions between nearby states. This is punctuated by periodic, short-lived periods of rapid downhill tran- sitions that result in a large proportion of excess exciton energy being transferred to the vibrational motion of the nanoparticle. The time for relaxation to below the 2.0E[subscript g] cutoff was on the order of 1ps. | en |
| dc.description.department | Chemistry | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.uri | http://hdl.handle.net/2152/26118 | en |
| dc.language.iso | en | en |
| dc.subject | Nonradiative relaxation | en |
| dc.subject | Cadmium Selenide | en |
| dc.subject | Nonadiabatic dynamics | en |
| dc.title | Nonradiative decay of singlet excitons in cadmium selenide nanoparticles | en |
| dc.type | Thesis | en |