Ultrafast singlet fission dynamics in polymer-based thin-films measured by femtosecond transient absorption spectroscopy
Singlet fission is a photophysical process which converts an excited singlet state into two independent triplet states. This has attracted significant attention for photovoltaic devices due to the fact that more than one electron can be generated per each absorbed photon, which can boost the quantum...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/377307 |
| Acceso en línea: | https://hdl.handle.net/2117/377307 |
| Access Level: | acceso abierto |
| Palabra clave: | Flash photolysis Photovoltaic power generation Thin films transient absorption spectroscopy organic photovoltaics singlet fission thin films Fotoquímica Energia solar fotovoltaica Capes fines Àrees temàtiques de la UPC::Física::Física de l'estat sòlid |
| Sumario: | Singlet fission is a photophysical process which converts an excited singlet state into two independent triplet states. This has attracted significant attention for photovoltaic devices due to the fact that more than one electron can be generated per each absorbed photon, which can boost the quantum efficiency over 100 %. In this project, research on the understanding of singlet fission dynamics of organic thin films has been conducted by using transient absorption spectroscopy as the main characterisation method of the proposed polymer-based films, which are a mixture of TIPS-pentacene and Y6. Results have shown that charge generation is due to the triplet states generated thanks to the excitation at 800 nm of TIPS-pentacene in blends at certain ratios. Moreover, as an extra work, solar cells have been fabricated obtaining a 10 % of quantum efficiency due only to the triplet states generation. |
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