Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2012
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| Online Access: | http://hdl.handle.net/1721.1/75635 |
| _version_ | 1826190957250347008 |
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| author | Jadhav, Priyadarshani |
| author2 | Marc A. Baldo. |
| author_facet | Marc A. Baldo. Jadhav, Priyadarshani |
| author_sort | Jadhav, Priyadarshani |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012. |
| first_indexed | 2024-09-23T08:48:12Z |
| format | Thesis |
| id | mit-1721.1/75635 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:48:12Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/756352019-04-10T19:08:11Z Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells Jadhav, Priyadarshani Marc A. Baldo. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 107-115). Organic semiconductor photovoltaics hold the promise of cheap production and low manufacturing setup costs. The highest efficiency seen in research labs, ~10% today, is still too low for production. In this work we explore implementations of a multiple exciton generation process, singlet exciton fission, to work around the Shockley-Queisser limit, according to which, all single junctions cells have a theoretical efficiency limit of 33.7%. This is the first implementation of a singlet fission photovoltaic. We measured a singlet fission efficiency of 72% at room temperature. We showed that singlet fission can be implemented in bulk heterojunction photovoltaics, which is an important result since some of the highest efficiency organic photovoltaics in the last 5 years have been bulk heterojunction structures. Secondly, we showed that the magnetic field effect can be used as a probe to investigate triplet dissociation in singlet fission devices. Thirdly, we implemented singlet fission photovoltaics, using the singlet fission material pentacene as donor and low bandgap infrared-absorptive lead chalcogenide quantum dots as acceptors. Singlet fission can enhance the efficiency of organic photovoltaics only if the fission material is paired with an absorptive low-energy-gap material. We find that pentacene triplet excitons dissociate at the pentacene/quantum dot heterojunctions with an internal quantum efficiency of 35%. Lastly, we investigate a series of materials to find a better acceptor in singlet fission photovoltaics using the methods and some results from the previous two investigations. We investigate device structures that pair pentacene and 6,13 diphenyl-pentacene as singlet fission donors with C60 , perylene diimides, PbS quantum dots and PbSe quantum dots as acceptors. by Priyadarshani Jadhav. Ph.D. 2012-12-13T18:47:58Z 2012-12-13T18:47:58Z 2012 2012 Thesis http://hdl.handle.net/1721.1/75635 818213268 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 115 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Jadhav, Priyadarshani Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title | Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title_full | Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title_fullStr | Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title_full_unstemmed | Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title_short | Singlet exciton fission, a multi-exciton generation process, in organic semiconductor solar cells |
| title_sort | singlet exciton fission a multi exciton generation process in organic semiconductor solar cells |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/75635 |
| work_keys_str_mv | AT jadhavpriyadarshani singletexcitonfissionamultiexcitongenerationprocessinorganicsemiconductorsolarcells |