Multiple linker half-squarylium dyes for dye-sensitized solar cells; are two linkers better than one?

Connell, Arthur; Holliman, Peter J.; Jones, Eurig W.; Furnell, Leo; Kershaw, Christopher P.; Davies, Matthew L.; Gwenin, Christopher; Pitak, Mateusz B.; Coles, Simon J.; Cooke, Graeme

doi:10.1039/c4ta06896c

Cited by 21 publications

(24 citation statements)

References 41 publications

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“…In this context, theoretical modelling can provide valuable insights (e.g. predicting HOMO–LUMO levels) to minimize synthetic time by helping to identify desirable target dye molecules [7,8]. …”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

“…Figure 4 shows the core chromophore of half-squaraine (HfSQ) dyes along with points around the dye periphery which can be modified in a controlled way with different anchor groups [7,8]. In this way, HfSQ dyes can be used as sensitizers not only in their own right, but also as a model chromophore to predict similar effects in other dyes.…”

Section: Dye Anchoring Groupsmentioning

confidence: 99%

“…The increase in performance was due to an increase in V oc [7]. A follow up paper by Holliman et al [8] looked at how multiple linkers affected the orientation of the dye on TiO 2 surfaces. When dyes with a single anchoring group were bonded to the TiO 2 they must bind at the only site available to them; the best anchoring group being located at the squaric acid moiety.…”

Section: Dye Anchoring Groupsmentioning

confidence: 99%

“…When a second anchoring group was introduced (off the N of the indole), little effect was seen on the dye HOMO–LUMO gap. However, the data showed a significant increase in device stability and efficiency, achieving the highest ever recorded efficiency [8] for a HfSQ device. Devices could be measured over days rather than minutes suggesting that the dye was bound to the titania via two anchoring groups.…”

Section: Dye Anchoring Groupsmentioning

confidence: 99%

“…Having two dyes absorbing the same wavelengths effectively means the dyes are competing for the same photons, leading to low efficiencies and low J sc . However, two dyes absorbing in different areas of the AM 1.5 solar spectrum can act like a single panchromatic dye, absorbing more photons and producing a higher J sc and therefore a higher η [7,8,17,67]. However, the HOMO/LUMO energy levels (of the different dyes) need to differ sufficiently (> 0.2 eV) from one another to inhibit any electronic interactions between them.…”

Section: Dye Loading and Co-sensitizationmentioning

confidence: 99%

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A perspective on using experiment and theory to identify design principles in dye-sensitized solar cells

Holliman

Kershaw

Connell

et al. 2018

Science and Technology of Advanced Materials

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Dye-sensitized solar cells (DSCs) have been the subject of wide-ranging studies for many years because of their potential for large-scale manufacturing using roll-to-roll processing allied to their use of earth abundant raw materials. Two main challenges exist for DSC devices to achieve this goal; uplifting device efficiency from the 12 to 14% currently achieved for laboratory-scale ‘hero’ cells and replacement of the widely-used liquid electrolytes which can limit device lifetimes. To increase device efficiency requires optimized dye injection and regeneration, most likely from multiple dyes while replacement of liquid electrolytes requires solid charge transporters (most likely hole transport materials – HTMs). While theoretical and experimental work have both been widely applied to different aspects of DSC research, these approaches are most effective when working in tandem. In this context, this perspective paper considers the key parameters which influence electron transfer processes in DSC devices using one or more dye molecules and how modelling and experimental approaches can work together to optimize electron injection and dye regeneration.

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Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Section: Dye Anchoring Groupsmentioning

confidence: 99%

Section: Dye Anchoring Groupsmentioning

confidence: 99%

Section: Dye Anchoring Groupsmentioning

confidence: 99%

Section: Dye Loading and Co-sensitizationmentioning

confidence: 99%

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A perspective on using experiment and theory to identify design principles in dye-sensitized solar cells

Holliman

Kershaw

Connell

et al. 2018

Science and Technology of Advanced Materials

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Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Hill

Holliman

McGettrick

et al. 2017

Lubrication Science

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Surface lubricity on TiO2‐coated galvanised steels can be controlled by solution depositing perfluorooctanoic (C8), lauric (C12) or stearic (C18) acids to avoid lubricating oils/emulsions or substrate pre‐etching to remove surface oxide that add cost and waste. Water contact angles reveal increased surface hydrophobicity on coated samples that correlate with linear friction testing, suggesting water contact angle can be used to screen lubricity compounds. Linear friction testing shows that C12 and C18 lower the coefficient of friction (μ) by 50–60% compared with uncoated substrates whilst C8 drops μ from 0.31 to 0.22. Surfaces have been characterised by X‐ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy, whilst infrared confirms that as‐deposited coatings contain physisorbed and deprotonated acids chemisorbed through esters and thermal gravimetric analysis confirms increasing loadings from C8 to C12 to C18. Surface washing removes physisorbed material and lowers μ by increasing surface organisation and alkyl chain packing that enhances frictional energy dissipation through steric quenching. Copyright © 2017 John Wiley & Sons, Ltd.

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Atomically Precise Noble Metal Clusters Harvest Visible Light to Produce Energy

et al. 2017

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Atomically precise gold and silver clusters are a new class of sensitizers which can be used as substitutes for dyes in the classical dye‐sensitized solar cells (DSCs). Here noble metal clusters protected by proteins and thiols (Au30@BSA, Au25SBB18, and Ag44MBA30) have been used for photovoltaic studies. These metal clusters were used as sensitizers for the photoanodes fabricated using TiO2 nanotubes (NTs) and the commercial P25 TiO2 nanoparticles. The TiO2, clusters and the solar cells were characterized by spectroscopy, microscopy, current‐voltage (I‐V) and incident photon‐to‐current conversion efficiency (IPCE) measurements. A systematic I‐V study revealed a conversion efficiency of 0.35 % for the Au30@BSA sensitized solar cell made from TiO2 NTs which showed an IPCE maximum of 3 % at ∼ 400 nm.

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Multiple linker half-squarylium dyes for dye-sensitized solar cells; are two linkers better than one?

Abstract: This paper studies the effects of different numbers of linkers on half-squaraine dyes in DSC devices.

Cited by 21 publications

References 41 publications

A perspective on using experiment and theory to identify design principles in dye-sensitized solar cells

A perspective on using experiment and theory to identify design principles in dye-sensitized solar cells

Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications

Atomically Precise Noble Metal Clusters Harvest Visible Light to Produce Energy

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