Capture and control of excitations
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, February, 2021
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2021
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| Online Access: | https://hdl.handle.net/1721.1/130829 |
| _version_ | 1826188576886358016 |
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| author | Sinclair, Timothy S.(Timothy Scott) |
| author2 | Moungi G. Bawendi. |
| author_facet | Moungi G. Bawendi. Sinclair, Timothy S.(Timothy Scott) |
| author_sort | Sinclair, Timothy S.(Timothy Scott) |
| collection | MIT |
| description | Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, February, 2021 |
| first_indexed | 2024-09-23T08:01:50Z |
| format | Thesis |
| id | mit-1721.1/130829 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:01:50Z |
| publishDate | 2021 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1308292021-05-26T03:40:48Z Capture and control of excitations Sinclair, Timothy S.(Timothy Scott) Moungi G. Bawendi. Massachusetts Institute of Technology. Department of Chemistry. Massachusetts Institute of Technology. Department of Chemistry Chemistry. Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, February, 2021 Cataloged from the official PDF of thesis. Includes bibliographical references (pages 76-81). Fundamental understanding of the capture and control of excitations, including photons and excitons, in optoelectronic devices is important to optimizing their performance. Devices such as luminescent solar concentrators and signal concentrators that increase the efficiency of solar energy production and the speed of point-to-point communication, respectively, will be crucial for maximizing the sustainability and connectedness of the world going forward. Behind the workings of these devices are micro-scale interactions of excitations with the device materials that must be carefully modeled and well understood. In this thesis, I model the performance of both luminescent solar concentrators and signal concentrators using the Monte Carlo method to predict the efficiency from the average results of many trials of quantum behavior. For each of these devices, I propose a path to improved performance. For luminescent solar concentrators, this is the use of tandem fluorophores. In this approach, the addition of a second fluorophore material increases the amount of sunlight that can be absorbed without interfering with the efficiency at which the first fluorophore collects solar photons. For signal concentrators, this is a mutli-aggregate fluorophore with <100 ps fluorescence lifetime that does not re-absorb its own emission because of the introduction of an artificial Stokes' shift. In addition, in this thesis I model the photophysical properties of the C8S3 J-aggregate to understand two of its properties: the long exciton migration it exhibits, and its ability to be irreversibly photobrightened and reversibly photodarkened under continuous illumination. I show the exciton migration distance is due to strong nearest-neighbor coupling along a helical direction that is aligned close to the axis of the aggregate tube, while the photobrightening and photodarkening behaviors are due to changes in two different types of disorder. by Timothy S. Sinclair. Ph. D. Ph.D. Massachusetts Institute of Technology, Department of Chemistry 2021-05-25T18:21:55Z 2021-05-25T18:21:55Z 2021 2021 Thesis https://hdl.handle.net/1721.1/130829 1252628037 eng MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided. http://dspace.mit.edu/handle/1721.1/7582 81 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Chemistry. Sinclair, Timothy S.(Timothy Scott) Capture and control of excitations |
| title | Capture and control of excitations |
| title_full | Capture and control of excitations |
| title_fullStr | Capture and control of excitations |
| title_full_unstemmed | Capture and control of excitations |
| title_short | Capture and control of excitations |
| title_sort | capture and control of excitations |
| topic | Chemistry. |
| url | https://hdl.handle.net/1721.1/130829 |
| work_keys_str_mv | AT sinclairtimothystimothyscott captureandcontrolofexcitations |