Ferrocene as a rapid charge regenerator in dye-sensitized solar cells

El‐Zohry, Ahmed M.; Cong, Jiayan; Karlsson, Martin; Kloo, Lars; Zietz, Burkhard

doi:10.1016/j.dyepig.2016.05.021

Cited by 36 publications

(63 citation statements)

References 42 publications

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“…Recently, it has been demonstrated that due to the presence of charge-separated TICT state in tri-phenyl methane based ferrocene molecule can exhibit higher solar cell efficiency by 325% than the corresponding ICT derivative. [20,75] This observation directs toward the future possibility of using such TICT based low-cost coumarin molecules for improved DSSC application owing to their higher electron injection yield and slow charge recombination phenomena.…”

Section: Solar Cell Performance As a Function Of Twisting Angle Of Comentioning

confidence: 92%

An Insight of Molecular Twisting of Coumarin Dyes

Debnath

Ghosh

2020

ChemistrySelect

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This article highlights the recent understanding of twisted intramolecular charge transfer state (TICT) of coumarin dyes on TiO 2 and Au NP surface. The natural origin of coumarin dye in several plants makes it attractive to solar cell and fluorescence sensing applications. Two different classes of D-π-A coumarin dyes, having cyano-acrylic acid as acceptor and 7-amino moiety as a donor, have been chosen: one of them, having 7-amino moiety in the ring, shows only intramolecular charge transfer (ICT) states in the excited state. While due to twisting of the free 7-amino moiety, the second class of coumarin shows both ICT and TICT states in their photo-excited states in the polar environment, in the form of a strong dual-fluorescence. On TiO 2 surface such coumarin dyes found to couple with carboxylic moiety, however on Au NP surface they bind with amino moiety. As a result, on TiO 2 surface, the 7-amino moiety is free to rotate, thus exhibiting TICT state which is a charge-separated state and leads to higher electron injection yield for the second class of coumarins. The applicability of such twisted conformers of coumarin molecules in the solar cell has been demonstrated. Furthermore, due to molecular coupling with the 7-amino moiety on Au NP surface, a restriction imposed on the molecular twisting of the free 7-amino group. This constrains the formation of the TICT state for the second class of coumarins on the Au NP surface. Such ICT-TICT fluorescence modulation character of the coumarin dyes may lead them to use for fluorescence sensing application, which is also demonstrated to detect specific ions and biomolecules. Thus the present review acmes very fundamental photophysical properties of coumarin dyes based on their molecular twisting on different solvents, semiconductors, and metal nanoparticles which have great consequences of real life applications.

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Section: Solar Cell Performance As a Function Of Twisting Angle Of Comentioning

confidence: 92%

An Insight of Molecular Twisting of Coumarin Dyes

Debnath

Ghosh

2020

ChemistrySelect

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“…[ 29–31 ] Recent trends to replace ruthenium dyes with organic or copper dyes and I − /I 3 − ‐based electrolytes with earth‐abundant transition metals such as cobalt‐, iron‐, or copper‐based electrolytes have opened up new pathways to commercialization. [ 32–52 ]…”

Section: Introductionmentioning

confidence: 99%

The Performance‐Determining Role of Lewis Bases in Dye‐Sensitized Solar Cells Employing Copper‐Bisphenanthroline Redox Mediators

Fürer

Milhuisen

Kashif

et al. 2020

Advanced Energy Materials

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Copper redox mediators have enabled open‐circuit voltages (VOC) of over 1.0 V in dye‐sensitized solar cells (DSCs) and have helped to establish DSCs as the most promising solar cell technology in low‐light conditions. The addition of additives such as 4‐tert‐butylpyridine (tBP) to these electrolytes has helped in achieving high solar cell performances. However, emerging evidence suggests that tBP coordinates to the Cu(II) species and limits the performance of these electrolytes. To date, the implications of this coordination are poorly understood. Here, the importance of Lewis base additives for the successful implementation of copper complexes as redox mediators in DSCs is demonstrated. Two redox couples, [Cu(dmp)2]+/2+ and [Cu(dpp)2]+/2+ (with dmp = 2,9‐dimethyl‐1,10‐phenanthroline and dpp = 2,9‐diphenyl‐1,10‐phenanthroline) in combination with three different Lewis bases, TFMP (4‐(trifluoromethyl)pyridine), tBP, and NMBI (1‐methyl‐benzimidazole), are considered. Through single‐crystal X‐ray diffraction analysis, absorption, and 1H‐NMR spectroscopies, the coordination of Lewis bases to the Cu(II) centers are studied. This coordination efficiently suppresses recombination losses and is crucial for high performing solar cells. If, however, the coordination involves a ligand exchange, as is the case for [Cu(dpp)2]+/2+, the redox mediator regeneration at the counter electrode is significantly retarded and the solar cells show current limitations.

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“…Resulting from the infinite of possible combinations, its remarkable photochemical, electrochemical and thermal stability, the scope of applicability of ferrocene has been greatly enlarged, and over the years, applications going from Organic Electronics i.e. solar cells [9][10][11], light-emitting diodes [12], transistors [13], to non-linear optical (NLO) applications [14], molecular recognition [15], corrosion inhibition [16], ion sensing [17], photoinitiation of polymerization [18] or cancer research have been developed [19]. Parallel to the emergence of new applications, chemistry of ferrocene has greatly progressed in 70 years and this chemistry is now a mature field with regards to the number of publications reporting to the chemical modifi cation of ferrocene.…”

Section: Introductionmentioning

confidence: 99%

Ferrocene: An unrivaled electroactive building block for the design of push-pull dyes with near-infrared and infrared absorptions

2019

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Ferrocene is an exceptional building block for the development of dyes with reversible redox properties. Dyes absorbing int the near infrared and infrared region are actively researched due to their potential applications ranging from telecommunication to defence systems. In this review, an overview of the different NIR and infrared dyes reported to date is presented. Parallel to the photophysical characteristics, the synthetic pathways giving access to these structures is presented.

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Ferrocene as a rapid charge regenerator in dye-sensitized solar cells

Cited by 36 publications

References 42 publications

An Insight of Molecular Twisting of Coumarin Dyes

An Insight of Molecular Twisting of Coumarin Dyes

The Performance‐Determining Role of Lewis Bases in Dye‐Sensitized Solar Cells Employing Copper‐Bisphenanthroline Redox Mediators

Ferrocene: An unrivaled electroactive building block for the design of push-pull dyes with near-infrared and infrared absorptions

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