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Issue 10, 2012
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The effect of selective interactions at the interface of polymer–oxide hybrid solar cells

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Abstract

The working mechanisms of excitonic solar cells are strongly dominated by interface processes, which influence the final device efficiency. However, it is still very challenging to clearly track the effects of inter-molecular processes at a mesoscopic level. We report on the realization of polymer-based hybrid solar cells made of prototypical materials, namely, poly(3-hexylthiophene) (P3HT) finely infiltrated in a TiO2 scaffold, with power conversion efficiency exceeding 1%. A step-change improvement in the device performance is enabled by engineering the hybrid interface by the insertion of an appropriate molecular interlayer. An unprecedented set of characterization techniques, including time-resolved optical spectroscopy, X-ray photoemission spectroscopy, positron annihilation spectroscopy and atomistic simulations, allows us to rationalize our findings. We show that a suitable chemical structure of the interlayer molecule induces selective intermolecular interactions, and thus a preferential surface energetic landscape and morphological order at the interface which consequently drives a strong improvement in charge generation and a decrease in recombination losses.

Graphical abstract: The effect of selective interactions at the interface of polymer–oxide hybrid solar cells

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Article information


Submitted
11 May 2012
Accepted
24 Jul 2012
First published
24 Jul 2012

Energy Environ. Sci., 2012,5, 9068-9076
Article type
Paper

The effect of selective interactions at the interface of polymeroxide hybrid solar cells

E. V. Canesi, M. Binda, A. Abate, S. Guarnera, L. Moretti, V. D'Innocenzo, R. Sai Santosh Kumar, C. Bertarelli, A. Abrusci, H. Snaith, A. Calloni, A. Brambilla, F. Ciccacci, S. Aghion, F. Moia, R. Ferragut, C. Melis, G. Malloci, A. Mattoni, G. Lanzani and A. Petrozza, Energy Environ. Sci., 2012, 5, 9068
DOI: 10.1039/C2EE22212D

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