Oligothiophene-Containing Coumarin Dyes for Efficient Dye-Sensitized Solar Cells

Hara, Kohjiro; Wang, † Zhong-Sheng; Sato, Tadatake; Furube, Akihiro; Katoh, Ryuzi; Sugihara, Hideki; Dan-oh, Yasufumi; Kasada, Chiaki; Shinpo, and Akira; Suga, Sadaharu

doi:10.1021/jp0518557

Cited by 571 publications

(354 citation statements)

References 76 publications

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“…The device sensitized with cocktail dye has a much stronger optical absorption compared with the five dyes in the broad visible region. The shifts of the absorption spectra by adsorption on the oxide surface have also been observed in other organic dyes 31 and may be attributed to a strong interaction between the anchoring group of the dye and the semiconductor surface. 2 This kind of interaction also leads to an aggregated state of the dye on the film.…”

Section: Resultssupporting

confidence: 52%

A Comparative Study of Nanostructured TiO2, ZnO and Bilayer TiO2/ZnO Dye-Sensitized Solar Cells

Rani

Tripathi

2015

Journal of Elec Materi

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Titanium dioxide (TiO 2 ), Zinc oxide (ZnO) and bilayer TiO 2 /ZnO (TZO) based cells have been developed and sensitized with five organic dyes and one cocktail dye composed of five dyes. Photovoltaic performance of TiO 2 and ZnO solar cell sensitized with six dyes is compared to that of bilayer TZO cells. The forward current is found to increase with applied voltage in the range V £ 0.4 V, which is dominated by thermionic emission, whereas in 0.4 £ V £ 0.7 V, the current transport is due to space charge-limited current controlled by exponential trap distribution in all devices. The combined properties of the materials enhance the efficiency of composite TZO cells. TiO 2 permits the formation of an energy barrier at the ZnO electrode/electrolyte interface, which reduces the back electron transfer from the conduction band of ZnO to I 3 À in the electrolyte. Also, due to the TiO 2 layer on the ZnO, the latter forms a compact layer between flourine-doped tin oxide (FTO)/TiO 2 which benefits the fast electron transfer from TiO 2 to ZnO to FTO glass. This reduces the charge recombination occurring at the ZnO/FTO interface leading to higher open circuit voltage (V oc ), higher short circuit current (J sc ), lower series resistance (R s ), and in turn higher efficiency in TZO solar cells as compared to ZnO cells. Among the six dyes, Eosin-Y and Rose Bengal dye gave the best performance as sensitizers with TZO.

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Section: Resultssupporting

confidence: 52%

A Comparative Study of Nanostructured TiO2, ZnO and Bilayer TiO2/ZnO Dye-Sensitized Solar Cells

Rani

Tripathi

2015

Journal of Elec Materi

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“…Among the donor moieties, N, N-dimethylaniline group, 9,10 coumarins, [11][12][13][14][15][16][17] tetrahydroquinolines, 18,19 pyrrolidine, 20 carbazoles, 21 diphenylamine, 22 triphenylamine, [23][24][25][26] etc have been widely used for the dye synthesis. A linker moiety is a spacer added between the donor and acceptor moieties.…”

Section: Introductionmentioning

confidence: 99%

“…A linker moiety is a spacer added between the donor and acceptor moieties. Different π-conjugated linker groups such as the -C=C-chain, [9][10][11][12][13]16,24 thiophene units (and its derivatives), 11,[14][15][16][17][18][19][20][21][22]26 etc have also been investigated. In particular two types of acceptor/anchor groups, namely cyanoacrylic acid, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and carboxylic acid [27][28][29] are widely used in organic dyes for DSSC.…”

Section: Introductionmentioning

confidence: 99%

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

et al. 2012

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We report a TD-DFT study of three polyene dyes namely: NKX-2553, NKX-2554 and NKX-2569 in isolation as well as upon their adsorption on TiO 2 nanoparticles. By choosing closely related dyes we wish to focus on the effects of structural variations on the absorption and charge-transfer properties of these systems. These three dyes show a non-intuitive trend in their respective efficiencies and therefore, were chosen to shed light on the structural components that contribute to this behaviour. Although, NKX-2554 has an additional donor group, it is less efficient compared to the simpler NKX-2553 dye that contains only one donor group. When NKX-2554 structure is slightly modified by lengthening the linker-group, one obtains the most efficient dye among this set, namely, NKX-2569. In this work, we show that the changes in the donor moiety has very little or no effect on the efficiency of these dyes as can be seen in the case of NKX-2553 and NKX-2554. On the other hand, the improved performance of NKX-2569-titania complex can be understood to be a result of the longer linker group. A better understanding of these properties within different dye-titania complexes is important for the continual improvement of DSSCs. In this regards, this study will serve to provide guidelines to improve efficiencies of novel organic dyes.

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“…The combination of these factors makes these dyes less desirable for the industrial production of DSC devices [24]. These problems have led to the development of many new organic dyes including triarylamines [25–27], coumarins [28], cyanines [29], indolines [30,31], squaraines [32–34], quinoxalines [35] and natural dyes [36]. These organic dyes are designed with a donor-ᴨ-linker-acceptor (D-π-A) structural arrangement, and absorb in the same region as Ru-by dyes.…”

Section: Development In Sensitizer/dyesmentioning

confidence: 99%

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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Oligothiophene-Containing Coumarin Dyes for Efficient Dye-Sensitized Solar Cells

Cited by 571 publications

References 76 publications

A Comparative Study of Nanostructured TiO2, ZnO and Bilayer TiO2/ZnO Dye-Sensitized Solar Cells

A Comparative Study of Nanostructured TiO2, ZnO and Bilayer TiO2/ZnO Dye-Sensitized Solar Cells

A TD-DFT study of the effects of structural variations on the photochemistry of polyenedyes

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

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