Dye-sensitized solar cells strike back

Muñoz‐García, Ana B.; Benesperi, Iacopo; Boschloo, Gerrit; Concepcion, Javier J.; Delcamp, Jared H.; Gibson, Elizabeth A.; Meyer, Gerald J.; Pavone, Michele; Pettersson, Henrik; Hagfeldt, Anders; Freitag, Marina

doi:10.1039/d0cs01336f

Cited by 269 publications

(313 citation statements)

References 860 publications

(1,199 reference statements)

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“…When analyzing the chemical structures of some of the most efficient organic dyes reported in DSSCs, [24][25][26][27][28] it appears that a benzothiadiazole (BTD) unit is oen used as a building block. 7,29 However, surprisingly, this motif has rarely been considered for the preparation of dyes applicable in photocatalysis 30 or DSPECs. 31 BTD is an electron-decient unit, widely used in the synthesis of dyes for DSSCs, since it increases the push-pull effect in the dye structure, thus shiing the internal charge transfer (ICT) absorption band towards longer wavelengths and improving the spatial separation of HOMO and LUMO orbitals.…”

Section: Introductionmentioning

confidence: 99%

Push–pull organic dyes and dye-catalyst assembly featuring a benzothiadiazole unit for photoelectrochemical hydrogen production

Moinel

Brochnow

Aumaître

et al. 2022

Sustainable Energy Fuels

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Section: Introductionmentioning

confidence: 99%

Push–pull organic dyes and dye-catalyst assembly featuring a benzothiadiazole unit for photoelectrochemical hydrogen production

Moinel

Brochnow

Aumaître

et al. 2022

Sustainable Energy Fuels

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“…Here, we focus onDSCs, which are low cost and can be prepared from nontoxic materials. [ 22,23 ] Specifically, we demonstrate that the optical analysis of the changes in the DSC electrolyte color occurring early on in an aging test, can be used as a valid proxy to the loss of charge carriers, and therefore used to predict the loss of performance of the solar cells. By tracking the loss rate of charge carriers directly, we can predict performance loss before it is visible in the more traditionally used current–voltage ( I–V ) measurement data.…”

Section: Introductionmentioning

confidence: 99%

Predictive Modeling of Dye Solar Cell Degradation

Poskela¹,

Tiihonen

Palonen³

et al. 2022

Solar RRL

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Degradation of dye solar cell performance based on the early changes in electrolyte color is predicted, allowing to estimate the lifetime of the dye solar cells even before their efficiency declines. Previous predictive models commonly rely on regression analysis of the predicted parameter; thus, they are unable to capture degradation before a significant decrease in performance. Degradation tests, even when accelerated, may take thousands of hours. As such, recognizing degradation trends early can lead to rewarding cuts in the duration of solar cell development pipelines. With accurate lifetime predictions, researchers can steer materials research to reach longer lifetimes in shorter cycles. The predictive power of our model relies on color changes in the electrolyte that directly correlate with the concentration of tri‐iodide charge carriers within it, the loss of which is the predominant degradation mechanism for most liquid‐electrolyte dye solar cells. By linking the physical mechanisms inside the cell, which eventually start to degrade the performance of dye solar cells, an early prediction of the lifetime can be made even when the device performance still appears stable. It is exemplified with dye solar cells that integrating architecture‐specific knowledge on degradation mechanisms has potential to improve lifetime predictions for photovoltaics.

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“…Dye-sensitized solar cells (DSCs) offer a convenient way to analyze interfacial electron transfer reactions within a well-understood framework. − In general, DSCs are continuing to attract intense research interest because of the ability to use these devices as building-integrated photovoltaics, ,− a relatively low production cost compared to many inorganic technologies, ,,, high performance in low-light environments such as those commonly used for consumer electronics, − and a continuous rise of power conversion efficiencies (PCEs). − PCEs as high as 14.3% for organic dye-based devices have been demonstrated, which have surpassed the highest PCEs of the traditionally dominant ruthenium-based sensitizers at approximately 11.9% …”

Section: Introductionmentioning

confidence: 99%

Preferential Direction of Electron Transfers at a Dye–Metal Oxide Interface with an Insulating Fluorinated Self-Assembled Monolayer and MgO

et al. 2021

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Slowing nondesirable electron transfer reactions at metal oxide–dye interfaces is important for many technologies. In particular, after an interfacial photoinduced charge separation event at a metal oxide–dye interface, it is critically important to limit the rate of electron transfer reactions back to sensitizers and to limit electron transfer reactions between the electrolyte and the metal oxide. Ruthenium-based dyes at metal oxide interfaces are widely used in many fields; however, these dyes often have poor surface insulation resulting in fast recombination kinetics with transition metal-based redox shuttles (RSs) in an electrolyte. This work explores two semiconductor surface modification strategies designed to minimize recombination events of electrons in TiO2 with oxidized RSs using a fluorinated siloxane insulator (PFTS) and a metal oxide insulator (MgO) with a well-known Ru dye, B11. Additionally, the influence of these treatments on the rate and duration of photoinduced interfacial charge separation at the TiO2–dye interface was examined. The TiO2-dye-RS systems were studied via dye-sensitized solar cell current–voltage curve, incident photon-to-current conversion efficiency, small modulated photovoltage transient, time-correlated single-photon counting, and transient absorption spectroscopy measurements. MgO was found to decrease the rate of the electron transfer reaction from the metal oxide to the electrolyte, decrease the rate of the electron transfer reaction to the oxidized dye from TiO2, increase the electron transfer reaction rate from a reduced RS to an oxidized dye, and decrease the electron injection rate from the photoexcited dye to TiO2. Interestingly, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (PFTS) was found to desirably improve these rates relative to MgO or untreated TiO2. A model based on electrostatic interactions is presented to explain the exceptional behavior of PFTS with density functional theory computational analysis of PFTS supporting this model.

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Dye-sensitized solar cells strike back

Abstract: Dye-sensitized solar cells (DSCs) are celebrating their 30th birthday and they are attracting a wealth of research efforts aimed at unleashing their full potential. Righteous font designed by Astigmatic and licensed under the Open Font License.

Cited by 269 publications

References 860 publications

Push–pull organic dyes and dye-catalyst assembly featuring a benzothiadiazole unit for photoelectrochemical hydrogen production

Push–pull organic dyes and dye-catalyst assembly featuring a benzothiadiazole unit for photoelectrochemical hydrogen production

Predictive Modeling of Dye Solar Cell Degradation

Preferential Direction of Electron Transfers at a Dye–Metal Oxide Interface with an Insulating Fluorinated Self-Assembled Monolayer and MgO

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