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Toward Efficient Solid-State p‑Type Dye-Sensitized Solar Cells: The Dye Matters
journal contribution
posted on 2016-12-12, 00:00 authored by Trang
T. T. Pham, Sudip K. Saha, David Provost, Yoann Farré, Mahfoudh Raissi, Yann Pellegrin, Errol Blart, Sylvain Vedraine, Bernard Ratier, Dmitry Aldakov, Fabrice Odobel, Johann BoucléPhotoelectrochemical
devices based on p-type nanostructured semiconducting
materials show strong potentialities for various applications, such
as photovoltaics and photocatalysis. While only one study was reported
on the use of the reference dye P1 for solid-state p-type dye-sensitized
solar cells (DSSC), in this work we have systematically investigated
two diketopyrrolopyrrole (DPP) derivatives as sensitizers for solid-state
p-type DSSC based on NiO and [6,6]-phenyl-C61-butyric acid
methyl ester (PCBM) as solid-state electron transporter material.
We report on the performance in solid-state p-type DSSC of a simple
DPP dye bearing a thienyl carboxylic acid as the binding group and
a parent compound substituted by a pyromellitimide (PYRO) playing
the role of a secondary inner electron acceptor. By focusing on the
dye/PCBM interface, we specifically show using transient photoluminescence
measurements that the presence of a secondary electron acceptor unit
can efficiently favor the formation of the (dye+/PCBM-) state, owing
to its significant reducing ability and lifetime of the charge separated
state. As a consequence, using these DPP derivatives leads to unprecedented
photocurrents up to 0.45 mA cm–2, which are 10 times
larger than previously reported values for the system based on P1.
Our analysis also demonstrates the strong correlation between the
ability of the dyes to efficiently generate charge carriers and the
resulting photocurrents.