Hyperbranched Quasi-1D TiO2 Nanostructure for Hybrid Organic–Inorganic Solar Cells

The performance of hybrid solar cells is strongly affected by the device morphology. In this work, we demonstrate a poly­(3-hexylthiophene-2,5-diyl)/TiO2 hybrid solar cell where the TiO2 photoanode comprises an array of tree-like hyperbranched quasi-1D nanostructures self-assembled from the gas phas...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2015-04, Vol.7 (14), p.7451
Main Authors: Ghadirzadeh, Ali, Passoni, Luca, Grancini, Giulia, Terraneo, Giancarlo, Li Bassi, Andrea, Petrozza, Annamaria, Di Fonzo, Fabio
Format: Article
Language:English
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Summary:The performance of hybrid solar cells is strongly affected by the device morphology. In this work, we demonstrate a poly­(3-hexylthiophene-2,5-diyl)/TiO2 hybrid solar cell where the TiO2 photoanode comprises an array of tree-like hyperbranched quasi-1D nanostructures self-assembled from the gas phase. This advanced architecture enables us to increase the power conversion efficiency to over 1%, doubling the efficiency with respect to state of the art devices employing standard mesoporous titania photoanodes. This improvement is attributed to several peculiar features of this array of nanostructures: high interfacial area; increased optical density thanks to the enhanced light scattering; and enhanced crystallization of poly­(3-hexylthiophene-2,5-diyl) inside the quasi-1D nanostructure.
ISSN:1944-8244
1944-8252
DOI:10.1021/am5090429