New fluoranthene-based cyanine dye for dye-sensitized solar cells

Wu, Wenjun; Guo, Fuling; Li, Jing; He, Jinxiang; Hua, Jing

doi:10.1016/j.synthmet.2010.02.018

Cited by 26 publications

(10 citation statements)

References 47 publications

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“… Structures proposed by Hua and co‐workers in 2007,119 2008,120 and 2010 121. See the Supporting Information for the complete structures.…”

Section: Structure–property Relationshipsmentioning

confidence: 87%

“…The same modification has also been introduced in cyanines, in particular unsymmetrical trimethines, by Hua and co‐workers in three different papers (Zhan et al in 2007119 [S117,118], Ma et al in 2008120 [S119,120], and Wu et al in 2010121 [S121,122]) (Figure 20). Unfortunately, although good work on synthesis has been reported, only the last paper can be used to assess structure–propriety relationships because the others did not include a full characterization (unreported TiO 2 thickness, unconventional lamp and impressive high J sc reported).…”

Section: Structure–property Relationshipsmentioning

confidence: 99%

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Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

et al. 2016

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Polymethine dyes as photosensitizers for dye‐sensitized solar cells (DSCs) are reviewed. The review provides a summary of design strategies, the main synthetic routes, and the optical and photovoltaic properties of polymethine dyes applied in hybrid photovoltaics. In particular, we focus on cyanine and squaraine dyes and their structure–properties relationships, highlighting the role of the active molecule design on device performance.

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“… Structures proposed by Hua and co‐workers in 2007,119 2008,120 and 2010 121. See the Supporting Information for the complete structures.…”

Section: Structure–property Relationshipsmentioning

confidence: 87%

Section: Structure–property Relationshipsmentioning

confidence: 99%

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

et al. 2016

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“…Noticeably, the effort toward high performance hemicyanine is not much explored even though it shows good light capturing ability toward the NIR region. Among the few reports, hemicyanine dyes comprising triphenylamine, 17,25,26 fluoranthene, 27 phenothiazine, 9 and tetrahydroquinoline 28 as donor units showed a strong absorption in the range of 500−650 nm in solution with ε of ∼10 4 −10 5 M −1 cm −1 . However, the PCE (2−5.5%) under simulated AM 1.5G illumination (100 mW cm −2 ) was moderate compared to other far-red active dyes because of formation of aggregates upon adsorption on the TiO 2 surface and adsorption of charges (dipole pointing toward TiO 2 ) on TiO 2 surface that alters the conduction band position.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The low V OC of NC dyes with I − / I 3 − redox couple are consistent with that of earlier reports on hemicyanine dyes. 27,17 The poor PCE of NC4−6 series is largely because of lower J SC and which is dropped by 48% going from NC1 to NC4 and maximum J SC loss for NC6 around 69%. Notably, HT donor connected to indolium units provides more conjugated and planar molecular structure that significantly showed high J SC with and without CDCA than TPA donor.…”

Section: ■ Introductionmentioning

confidence: 99%

Molecular Control of the Band Edge Movement and the Recombination Process in Donor–Acceptor Hemicyanine-Sensitized Solar Cells

2017

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The presence of downward shift in the band edge and the recombination reactions in the hemicyanine-sensitized solar cell reduces the open-circuit potential (V OC ) and the short-circuit current density (J SC ), which in turn decreases the dye cell performance. Choosing either an electrolyte possessing minimum overpotentials or a systematic dye design which can efficiently suppress the diffusion of charged species toward the TiO 2 can improve the overall power conversion efficiency (PCE). Here, a series of donor−acceptor (D-A) hemicyanine dyes were synthesized utilizing a planar heterotriangulene (HT) or triphenylamine (TPA) donor and alkyl-functionalized indolium carboxylic acid acceptor unit. By introducing strong HT donor instead of TPA, the photophysical, and electrochemical properties of D-A dyes are significantly modulated. The strong donor nature of HT and effective passivation of surface by hydrophobic alkyl chains close to the anchoring group for NC3 dye exhibits an average PCE of 4.34% with a V OC of 0.416 V, J SC of 20.04 mA cm −2 , and fill factor (ff) of 52.03% under simulated AM 1.5G illumination (100 mW cm −2 ) without 3α,7αdihydroxy-5β-cholic acid coadsorbent (CDCA). The intrinsic dipole of the hemicyanine dye and the presence of Li + ions in iodide/triiodide redox couple without tert-butylpyridine (TBP) additive induces a downward shift in conduction band edge (E CB ) of TiO 2 . By rational molecular design, the extend of shift in E CB is controlled and enhanced the V OC . Electrochemical impedance spectroscopy (EIS) studies revealed the high charge transfer resistance (R ct ) and long lifetime (τ) of injected electrons in HT-based dyes than that of TPA derivatives, which provide insight into the passivation of Li + and I − ions by current D-A dye design possessing alkyl functionalities to increase both the J SC and V OC .

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“…Upon absorption of incident light, dye molecules are excited and subsequently relax by the injection electron into the conduction band of the TiO 2 semiconductor. Both natural pigments [6]- [12] and synthetic dyes [13] [14] [15] [16] have been used as photosensitizers for DSSCs. Here, two different porphyrins dyes have been used as photosensitizers for DSSC.…”

Section: Introductionmentioning

confidence: 99%

Photophysical, Electrochemical and Photovoltaic Properties of Porphyrin-Based Dye Sensitized Solar Cell

Ghann¹,

Chavez-Gil²,

Goede³

et al. 2017

AMPC

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Porphyrins occur in a number of important biomolecules and are also synthetically made for use as probe component of chemical and biological sensors. The performance of dye sensitized solar cells with two different porphyrin dyes was investigated in this work. The two porphyrin complexes comprised of a metal-free 5, 10, 15, 20-meso-tetrakis-(9H-2-fluorene-yl) porphyrin (H 2 TFP) and its Zinc complex (ZnTFP). UV-Vis, Fluorescence, and Fourier transformed infrared measurements of the two dyes were carried out to evaluate their absorption, emission and binding characteristics. Both dyes absorbed light in the UV-visible region all the way to the near-infrared. The surface morphology and elemental analysis of the porphyrin dye sensitized photoanodes were determined using Field Emission Scanning Electron Microscopy Imaging and Transmission Electron Microscopy Imaging. Cyclic voltammetry studies, current-voltage characteristics and the electrochemical impedance spectroscopic studies were also carried out. Solar-to-electric energy efficiency of H 2 TFP dye sensitized solar cell was higher (0.11%) than that of the zinc complex (0.08%). Thus the metal free porphyrin generated more power than the zinc complex under similar conditions. The impedance measurement also displayed less overall resistance for the free porphyrin (50 Ω) compared with the zinc complex (130 Ω). The LUMO levels of H 2 TFP and ZnTFP sensitizers were −0.87 eV and −0.77 eV respectively. Both of these LUMO values are higher than the lower bound level of the conduction band of TiO 2 (−4.0 eV), ensuring the efficient injection of an electron from the excited porphyrin dye to the conduction band of the titanium dioxide.

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New fluoranthene-based cyanine dye for dye-sensitized solar cells

Cited by 26 publications

References 47 publications

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Molecular Control of the Band Edge Movement and the Recombination Process in Donor–Acceptor Hemicyanine-Sensitized Solar Cells

Photophysical, Electrochemical and Photovoltaic Properties of Porphyrin-Based Dye Sensitized Solar Cell

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