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@article{Flasque:2016:10.1021/acs.jpcc.6b05977,
author = {Flasque, M and Van, Nhien AN and Moia, D and Barnes, PRF and Sauvage, F},
doi = {10.1021/acs.jpcc.6b05977},
journal = {Journal of Physical Chemistry C},
pages = {18991--18998},
title = {Consequences of solid electrolyte interphase (SEI) formation upon aging on charge-transfer processes in dye-sensitized solar cells},
url = {http://dx.doi.org/10.1021/acs.jpcc.6b05977},
volume = {120},
year = {2016}
}

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TY  - JOUR
AB  - Solid electrolyte interphase (SEI) layers form on sensitized-TiO2 photoanodes and platinum counter electrodes when dye-sensitized solar cells (DSSCs) are subjected to an accelerated aging protocol (e.g., heating at 85 °C in the dark for 500 h). To understand how this impacts device operation, we conducted an electrochemical impedance spectroscopy study and found that the SEI induces an additional electron-transfer process from the TiO2 to the electrolyte. This is materialized by the onset of a new charge-transfer semicircle at higher frequencies, predominantly visible under bias voltages similar to and greater than the open-circuit voltage. Our results emphasize the detrimental role of SEI formation on device performance and lifetime. Additionally, nanosecond transient absorption spectroscopy showed that SEI formation reduced the rate of oxidized dye regeneration. We also found that a proportion of the photogenerated holes on the dyes were transferred to the SEI itself. A prolonged aging duration led to the electrode’s mesoporosity network being entirely clogged by the SEI, thus impeding efficient transport of the electrolyte redox couple and being responsible for a further decline in photovoltaic performances.
AU  - Flasque,M
AU  - Van,Nhien AN
AU  - Moia,D
AU  - Barnes,PRF
AU  - Sauvage,F
DO  - 10.1021/acs.jpcc.6b05977
EP  - 18998
PY  - 2016///
SN  - 1932-7455
SP  - 18991
TI  - Consequences of solid electrolyte interphase (SEI) formation upon aging on charge-transfer processes in dye-sensitized solar cells
T2  - Journal of Physical Chemistry C
UR  - http://dx.doi.org/10.1021/acs.jpcc.6b05977
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000382596900006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/42664
VL  - 120
ER  -

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