Multi‐Branched Multi‐Anchoring Metal‐Free Dyes for Dye‐Sensitized Solar Cells

Manfredi, Norberto; Cecconi, Bianca; Abbotto, Alessandro

doi:10.1002/ejoc.201402422

Cited by 115 publications

(69 citation statements)

References 69 publications

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“…[14] Metal-freeo rganic sensitizers have gained an increasing role in the scientific literature of H 2 production, [15][16][17] with record DSSC powerc onversione fficiencies (PCE) exceeding1 2%. [31,[36][37][38][39] Lastly,t he nitrogen atom of the central core of the PTZ groups can be conveniently functionalized with alkyl or aryl groups of different chemicaln ature, to provide af urtherd erivatization site able to induce additional properties, such as proper solubility in specific media (with particular attention to water) or affinity to bio-inspiredm olecules. [21][22][23][24][25][26][27] Triggered by recent studies on phenothiazine (PTZ) derivatives as DSSC sensitizers [28][29][30][31] and by their first uses as light harvesters in the photo-driven productiono fH 2 , [32][33][34] we decided to systematically investigate this promising class of dyes by designing as eries of organic sensitizers containing the PTZ core as ad onor scaffold in donor-p-acceptor molecules.…”

Section: Introductionmentioning

confidence: 99%

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

et al. 2015

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Dibranched donor-(π-acceptor)2 dyes, where phenothiazine is the donor core, cyanoacrylic acid is the acceptor/anchoring group, and π is represented by mono- and poly-cyclic simple and fused thiophene derivatives, were tested as photosensitizers in the photocatalytic production of H2 , in combination with a Pt/TiO2 catalyst. The optical and electrochemical properties of the dyes were investigated, showing that careful design of the thiophene-based π spacer afforded enhanced optical properties. In the H2 production over 20 h, the new thiophene-based sensitizers revealed improved stability after longer irradiation times and enhanced performances, in terms of H2 production rates and light-to-fuel efficiencies, after an initial activation period, which were for the first time associated with enhanced stability under photocatalytic production of H2 and the absence of critical dye degradation.

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Section: Introductionmentioning

confidence: 99%

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

et al. 2015

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“…D‐π‐A dyes have attracted in the last decade a large interest in DSSC and photocatalytic hydrogen generation thanks to their virtually infinite design variety, the large availability of D, π, and A libraries, their easy preparation and purification, the low lab‐scale and industrial manufacturing costs, and, most of all, their versatile tunability of optical and electrochemical properties.…”

Section: Device Chemical Componentsmentioning

confidence: 99%

Molecular Organic Sensitizers for Photoelectrochemical Water Splitting

et al. 2020

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The photoelectrochemical approach to photoinduced water splitting is gaining increasing interest for solar fuels generation. Dye‐sensitized photoelectrochemical cells (DS‐PEC) have been studied to improve the collection of the Vis range of solar radiation. Metal complexes have so far been the most investigated dyes but in recent years metal‐free organic dyes have emerged as a new frontier for the evolution of the sector. This Minireview systematically describes the use of organic sensitizers and has been organized in terms of dye‐sensitized photoactive electrode(s): photoanode; photocathode; tandem DS‐PEC with photoanode and photocathode. The main classes of dyes are introduced and described in their key properties, device performance, and water splitting data. Thanks to the increasing number of articles, this review highlights the growing importance of organic sensitizers and their molecular design for a more efficient solar generation of clean fuels.

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“…Sensitizers with multibranched, multianchoring, metal‐free dyes have attracted much attention in the past five years 55. Most studies focused on the dyes with two anchors 56.…”

Section: Metal‐free Sensitizers For Dsscsmentioning

confidence: 99%

Metal-Free Sensitizers for Dye-Sensitized Solar Cells

Chaurasia

Lin

2016

The Chemical Record

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This review focuses on our work on metal-free sensitizers for dye-sensitized solar cells (DSSCs). Sensitizers based on D-A'-π-A architecture (D is a donor, A is an acceptor, A' is an electron-deficient entity) exhibit better light harvesting than D-π-A-type sensitizers. However, appropriate molecular design is needed to avoid excessive aggregation of negative charge at the electron-deficient entity upon photoexcitation. Rigidified aromatics, including aromatic segments comprising fused electron-excessive and -deficient units in the spacer, allow effective electronic communication, and good photoinduced charge transfer leads to excellent cell performance. Sensitizers with two anchors/acceptors, D(-π-A)2 , can more efficiently harvest light, inject electrons, and suppress dark current compared with congeners with a single anchor. Appropriate incorporation of heteroaromatic units in the spacer is beneficial to DSSC performance. High-performance, aqueous-based DSSCs can be achieved with a dual redox couple comprising imidazolium iodide and 2,2,6,6-tetramethylpiperidin-N-oxyl, and/or using dyes of improved wettability through the incorporation of a triethylene oxide methyl ether chain.

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Multi‐Branched Multi‐Anchoring Metal‐Free Dyes for Dye‐Sensitized Solar Cells

Cited by 115 publications

References 69 publications

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

Molecular Organic Sensitizers for Photoelectrochemical Water Splitting

Metal-Free Sensitizers for Dye-Sensitized Solar Cells

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