Influence of the Sensitizer Adsorption Mode on the Open-Circuit Potential of Dye-Sensitized Solar Cells

Angelis, Filippo De; Fantacci, Simona; Selloni, Annabella; Grätzel, Michaël; Nazeeruddin, M. K.

doi:10.1021/nl071835b

Cited by 358 publications

(409 citation statements)

References 44 publications

(78 reference statements)

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“…I -, I3 -, NCS -, Gu + , polyacrylonitrile and probably other degradation byproducts from electrolyte) neither of these processes would be surprising. 27 However, given the reduction in the Voc of the aged device, an increase in the conduction band seems less likely than the possibility that some of the TiO2 surface traps have been passivated by the SEI. the SEI on electron -tri-iodide (or iodine) charge transfer reaction.…”

Section: Resultsmentioning

confidence: 99%

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

et al. 2016

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Solid electrolyte interphase (SEI) layers form on sensitized-TiO2 photo-anodes and platinum counter-electrodes when dye-sensitized solar cells (DSSCs) are subjected to an accelerated ageing protocol (e.g. heating at 85 °C in the dark for 500 hours). To understand how this will impact the device operation, electrochemical impedance spectroscopy study showed 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 semi-circle at higher frequencies, predominantly visible under bias voltage similar and above open circuit voltage. Our results emphasized on the detrimental role of the SEI formation on device performance and lifetime.Additionally, ns-transient absorption spectroscopy shows that SEI formation reduces the rate oxidised dye regeneration. We also show that a proportion of the photogenerated holes on the dyes are transferred to the SEI itself. Prolonged ageing duration leads to the electrode's mesoporosity network entirely clogged by the SEI; thus impeding efficient transport of the electrolyte redox couple, also responsible for a further decline in photovoltaic performances.2

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Section: Resultsmentioning

confidence: 99%

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

et al. 2016

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“…This tends to suggest that the four new dyes compared in this study have different dipole moment across the interface dye/TiO 2 as a result from either different molecular polarity and/or owing to a different molecular arrangement when anchored to the TiO 2 's surface [28]. The modification of the central core unit has only little effect on the energy of the traps if we compare VG2 vs. VG3 and VG11 vs. VG12.…”

Section: Dyementioning

confidence: 86%

Dicyanovinyl and Cyano-Ester Benzoindolenine Squaraine Dyes: The Effect of the Central Functionalization on Dye-Sensitized Solar Cell Performance

et al. 2016

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Abstract:In order to achieve a greater light absorption in the near-infrared (NIR) region with a panchromatic spectral response and to suppress the photo-isomerisation phenomenon, we herein report the design, synthesis, spectroscopic and electrochemical characterization of novel centrally functionalized symmetric benzoindolenine squaraine dyes. These molecules have shown different photoelectrical conversion properties, depending on the dicyanovinyl and cyano-ester group substitution on the squaric core unit and on the extension of the π-conjugation.

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“…0.04 V found in this study (vide ultra). However, there might be also other effects at play, such as different geometry of the dye/titania surface complex [44].…”

Section: Methodsmentioning

confidence: 99%

Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets

Laskova

Zukalová

Kavan

et al. 2012

J Solid State Electrochem

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A nanocrystalline TiO 2 (anatase) nanosheet exposing mainly the (001) crystal faces was tested as photoanode material in dye-sensitized solar cells. The nanosheets were prepared by hydrothermal growth in HF medium. Good-quality thin films were deposited on F-doped SnO 2 support from the TiO 2 suspension in ethanolic or aqueous media. The anatase (001) face adsorbs a smaller amount of the used dye sensitizer (C101) per unit area than the (101) face which was tested as a reference. The corresponding solar cell with sensitized (001)-nanosheet photoanode exhibits a larger open-circuit voltage than the reference cell with (101)-terminated anatase nanocrystals. The voltage enhancement is attributed to the negative shift of flatband potential for the (001) face. This conclusion rationalizes earlier works on similar systems, and it indicates that careful control of experimental conditions is needed to extract the effect of band energetic on the current/voltage characteristics of dye-sensitized solar cell.

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Influence of the Sensitizer Adsorption Mode on the Open-Circuit Potential of Dye-Sensitized Solar Cells

Cited by 358 publications

References 44 publications

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

Dicyanovinyl and Cyano-Ester Benzoindolenine Squaraine Dyes: The Effect of the Central Functionalization on Dye-Sensitized Solar Cell Performance

Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets

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