Synthesis of bianchored metal free organic dyes for dye sensitized solar cells

Ramkumar, S. Manian; Anandan, Sambandam

doi:10.1016/j.dyepig.2013.01.014

Cited by 49 publications

(12 citation statements)

References 44 publications

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“…For these dyes the synthetic approaches are typically Wittig or Horner–Wadsworth–Emmons condensations in the case of vinylene linkers, metal‐catalyzed cross‐coupling reactions20 – namely, Suzuki–Miyaura or Stille reactions – for aryl‐aryl bond formation and the Sonogashira reaction for the insertion of the ethynylene spacer. In a few examples the electron‐acceptor cyano substituent has been inserted into the vinylene spacer in combination with a thienyl19a or biphenyl19b system to further tune the conjugation character, lower the LUMO energy level and enhance absorption in the visible range. More complex thienyl‐based structures commonly used in linear dyes, such as bis‐alkoxythiophene or fused thiophene rings such as cyclopenta[1,2‐ b :5,4‐ b′ ]dithiophene, have seldom been used in D–(π–A) n dyes 16a.…”

Section: Design and Synthesismentioning

confidence: 99%

“…As shown in Table 2, common π‐spacers such as thienyl,26–28 bithienyl,27 phenyl,28 and furyl28 systems have been employed in carbazole‐based di‐branched structures. Even more structured moieties – cyanovinyldiphenyl19b and cyanovinylthienyl19a units, for example – have been tested. A number of acceptor/anchoring groups have been investigated, from the commonly used cyanoacrylic acid19,27,28 to rhodanine‐3‐acetic acid (to enhance optical properties19b,29) and also pyridine,26 a rare group as an anchoring unit, which exploits Lewis coordination to graft the dye to the TiO 2 surface.…”

Section: Design and Synthesismentioning

confidence: 99%

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

2014

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Multi‐branched multi‐anchoring metal‐free dyes as photosensitizers for dye‐sensitized solar cells (DSSCs) are reviewed. The article outlines design strategies, main synthetic routes and optical and photovoltaic properties of two families of multi‐branched sensitizers: (a) D–(π–A)n (D = donor, π = π‐spacer, A = acceptor/anchoring functionality) structures containing arylamine, carbazole, phenothiazine or phenoxazine derivatives as D groups, and (b) multi‐donor multi‐anchoring architectures from interconnected mono‐branched D–π–A arms, together with X‐ and Y‐shaped dyes. Although this class has been reported only in the last five years, a variety of molecular architectures, donors, and π‐spacers have been used and combined in multi‐branched molecules. The multi‐branched geometry induces distinctive features including enhanced qualitative and quantitative optical properties, increased currents and quantum efficiencies, and control of molecular aggregation.

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Section: Design and Synthesismentioning

confidence: 99%

Section: Design and Synthesismentioning

confidence: 99%

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

2014

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“…A typical DSSC is comprised of a nanocrystalline semiconductor (TiO 2 ), an electrolyte with redox couple (I 3 − /I − ), and a counter electrode (CE) to collect the electrons and catalyze the redox couple regeneration [6]. Extensive researches have been conducted in order for each component to achieve highly efficient DSSCs with a modified TiO 2 [7], alternative materials [8,9], and various structures [10-12]. Usually, Pt-coated fluorine-doped tin oxide (FTO) is used as a counter electrode owing to its superior catalytic activity [13].…”

Section: Introductionmentioning

confidence: 99%

A study of TiO2/carbon black composition as counter electrode materials for dye-sensitized solar cells

Lim

Ryu²,

Kim

et al. 2013

Nanoscale Res Lett

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This study describes a systematic approach of TiO2/carbon black nanoparticles with respect to the loading amount in order to optimize the catalytic ability of triiodide reduction for dye-sensitized solar cells. In particular, the cell using an optimized TiO2 and carbon black electrode presents an energy conversion efficiency of 7.4% with a 5:1 ratio of a 40-nm TiO2 to carbon black. Based on the electrochemical analysis, the charge-transfer resistance of the carbon counter electrode changed based on the carbon black powder content. Electrochemical impedance spectroscopy and cyclic voltammetry study show lower resistance compared to the Pt counter electrode. The obtained nanostructures and photo electrochemical study were characterized.

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“…1,2 Typical DSSCs consist of a nanocrystalline titanium oxide (TiO 2 ) mesoporous film, 3,4 a sensitizing dye, 5,6 an electrolyte containing a redox couple [7][8][9] and a platinum-coated counter electrode. 10,11 One of the most important components in DSSCs is the sensitizer, which can absorb sunlight and inject excited electrons into the conduction band of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of stable main-chain polymeric metal complex dyes based on phenothiazine or carbazole units for dye-sensitized solar cells

Liu

Xie

et al. 2016

Polym J

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Four novel polymeric metal complex dyes (P1-P4) based on phenothiazine or carbazole derivatives, containing complexes of diaminomaleonitrile with Zn(II) or Co(II) were synthesized and characterized by gel permeation chromatography, Fourier transform infrared spectroscopy, UV-visible absorption, cyclic voltammetry and elemental analysis. The dyes based on carbazole derivatives (P3, P4) exhibited wider absorption spectra, and after replacement of the Co(II) coordinated ion with Zn(II), a bathochromic shift in the absorption spectrum was observed. When used in dye-sensitized solar cells (DSSCs), the device sensitized by P3 exhibited the best photocurrent conversion efficiency (2.06%) under standard illumination with a short-circuit photocurrent density (J sc ) of 4.54 mA cm − 2 , an open-circuit photovoltage (V oc ) of 0.67 V and a fill factor (ff) of 67.8%. Moreover, these dyes all exhibited excellent chemical and thermal stability. These results reveal a new path for the design of novel conjugated organic polymer dyes for highly efficient DSSCs.

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Synthesis of bianchored metal free organic dyes for dye sensitized solar cells

Cited by 49 publications

References 44 publications

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

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

A study of TiO2/carbon black composition as counter electrode materials for dye-sensitized solar cells

Synthesis and characterization of stable main-chain polymeric metal complex dyes based on phenothiazine or carbazole units for dye-sensitized solar cells

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