Stark Effect in Perovskite/TiO<sub>2</sub> Solar Cells:
Evidence of Local Interfacial Order
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Abstract
To
unveil the mechanisms controlling photovoltaic conversion in
high-performing perovskite-based mesostructured solar cells, we focus
on the key role played by the mesoporous oxide/perovskite interface.
We employ several spectroscopic techniques to design a complete scenario
and corroborate our results with first principle density functional
theory calculations. In particular Stark spectroscopy, a powerful
tool allowing interface-sensitive analysis is employed to prove the
existence of oriented permanent dipoles, consistent with the hypothesis
of an ordered perovskite layer, close to the oxide surface. The existence
of a structural order, promoted by specific local interactions, could
be one of the decisive reasons for highly efficient carriers transport
within perovskite films