Studies on organic solar cells based on small-molecules : tetraphenyldibenzoperiflanthene and fullerene C70
This work deals with the research on organic solar cells based on small-molecules semiconductors. In particular, organic solar cells of this thesis have been used tetraphenyldibenzoperiflanthene as donor material and fullerene C70 as acceptor material. In the first part of this thesis, we focus on t...
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| Tipo de documento: | tese |
| Data de publicação: | 2015 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/95963 |
| Acesso em linha: | https://hdl.handle.net/2117/95963 https://dx.doi.org/10.5821/dissertation-2117-95963 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Biomolècules Cèl·lules solars Àrees temàtiques de la UPC::Enginyeria electrònica |
| Resumo: | This work deals with the research on organic solar cells based on small-molecules semiconductors. In particular, organic solar cells of this thesis have been used tetraphenyldibenzoperiflanthene as donor material and fullerene C70 as acceptor material. In the first part of this thesis, we focus on the influence of the density of states of the donor layer on the characteristic parameters of solar cells. Further, organic solar cells with p-i-n structure are presented, where the intrinsic layer is obtained by coevaporation of donor and acceptor. The influence of the thickness of the intrinsic layer on the p-i-n solar cell characteristic is analysed. In the second part, an equivalent circuit for organic solar cells is presented. A new term is added to the standard model representing recombination losses in the active layer of the device. The analysis of the characteristics of current - voltage measured at different illumination intensities allows the estimation of the term recombination. The model clearly separates technological issues (series and parallel resistance) from effects related to the physics of the device (recombination losses). It also allows obtaining an effective mobility-lifetime product in the active layer of the device to be determined, characterising its state of degradation. |
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