Design and implementation of an organic semi-transparent photovoltaic device
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Inclou dades d'ús des de 2022
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hdl:2117/98621
Tipus de documentTreball Final de Grau
Data2016-06
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Organic polymeric solar cells require thin absorber layers due to intrinsic low exciton diffusion
distances, thus showing low absorption of light. They are also characterized by having a low
absorption peak, whose position lies in the near-infrared, slightly affecting the visible spectrum.
By depositing thin silver layers of 10 nm for the back electrode, a semi-transparent organic solar
cell can be created. Attractive outcomes could result from these devices, like solar cell windows
that would remain visually transparent, while still collecting energy from the sun, or tandem
polymeric solar cells. The formation of a non-homogeneous and discontinuous silver layer when
depositing an ultra-thin film turns into a high resistivity electrode, therefore limiting the area that
such devices can reach and the maximum power that the cell can offer. The goal of this
bachelor thesis was to up-scale semi-transparent organic solar cells by characterizing the thin
electrode conductivity and enhancing its charge collection using thick grid-like layers of silver.
The cause for such high resistivity was confirmed by finding silver agglomerations of 30 nm in
size, and a lower limit for its value was found by studying the silver bulk resistivity. The upscaling
losses were determined in terms of the increase in area, and charge-collecting grids
were consequently tested. The building of organic solar cells by spin-coating and vapour
depositions was proved functional on top of non-flat substrates with roughness of the order of
100 nm. Fill Factor enhancements were found by designing optimal grid structures compatible
with highly transparent cells.
TitulacióGRAU EN ENGINYERIA FÍSICA (Pla 2011)
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TFG_Jordi_Puig_ef.pdf | 2,597Mb | Visualitza/Obre |