8-Hydroxylquinoline as a strong alternative anchoring group for porphyrin-sensitized solar cells

He, Hongshan; Gurung, Ashim; Si, Liping

doi:10.1039/c2cc31440a

Cited by 108 publications

(71 citation statements)

References 15 publications

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“…Recent investigation using 8-hydroxylquinoline to replace the conventional benzoic acid as an anchoring group for porphyrin-sensitized solar cells showed excellent stability against solvent desorption. 36 Work is underway to improve the long-term stability for the promising co-sensitization systems reported in the present study.…”

Section: Introductionmentioning

confidence: 85%

Molecular engineering of cocktail co-sensitization for efficient panchromatic porphyrin-sensitized solar cells

Pan

et al. 2012

Energy Environ. Sci.

145

102

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Co-sensitization of two or more dyes with complementary absorption spectra on a semiconductor film is an effective approach to enhance the performance of a dye-sensitized solar cell (DSSC). Porphyrin sensitizer YD2-oC8 showed outstanding photovoltaic performance co-sensitized with an organic dye to cover the entire visible spectral region, 400–700 nm. To promote the light-harvesting capability beyond 700 nm, a porphyrin dimer (YDD6) was synthesized for a co-sensitized system. We report a systematic approach for engineering of molecular co-sensitization of TiO2 films in a cocktail solution containing YD2-oC8, an organic dye (CD4) and YDD6 in a specific molar ratio to optimize the photovoltaic performance of the device. The resulting device showed panchromatic spectral features in the IPCE action spectrum in the region 400–700 nm attaining efficiencies of 75–80%; the spectrum is extended to the near-IR region attaining 40–45% in 700–800 nm region, giving JSC/mA cm 2 ¼ 19.28, VOC/mV ¼ 753, FF ¼ 0.719, and h ¼ 10.4% under standard AM 1.5 G one-sun irradiation. This performance is superior to what is obtained from the individual single-dye devices and the two-dye co-sensitized systems. The shifts of TiO2 potential upon dye uptake and the kinetics of charge recombination were examined through measurements of the charge extraction (CE) and intensity-modulated photovoltage spectroscopy (IMVS), respectively. Five co-sensitized systems were investigated to demonstrate that suppression of dye aggregation of YDD6 in the co-sensitized film is a key factor to further improve the device performance

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Section: Introductionmentioning

confidence: 85%

Molecular engineering of cocktail co-sensitization for efficient panchromatic porphyrin-sensitized solar cells

Pan

et al. 2012

Energy Environ. Sci.

145

102

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“…Boron dipyrromethene dyes (BET, Figure 56a) were also used as co-adsorber, being not only a chromophore able to transfer energy to porphyrin dyes but also an efficient intercalating agent. 210,228 When CDCA is used as co-adsorber, photoconversion efficiencies are usually enhanced but some of the binding position are lost; the use of BET in place of CDCA allows occupation of such positions with a chromophore which could harvest part of the solar light. The two different porphyrins ZnTMP and LD12 shown in Figure 56b were co-adsorbed with BET over TiO 2 to produce DSSC cells.…”

Section: Aggregation Effectsmentioning

confidence: 99%

“…209 Aiming at reducing dissociation of the dye from the TiO 2 surface and starting from the observation that 8-hydroxyquinoline (HO-Q) can easily form stable metal complexes through its N and O atoms, He et al used HO-Q as an anchoring group and (TPPZn-HO-Q) to build TiO 2 based dye sensitized cells. 210 TPPZn-HO-Q coated TiO 2 film was compared with TPPZn-CO 2 H coated TiO 2 film in which the widely used benzoic acid was the anchoring group ( Figure 47). As a matter of fact, the TPPZn-HO-Q/TiO 2 nanoparticle film is by far more stable than the analogous film in acidic conditions, although the cell efficiency was slightly lower.…”

Section: B Adsorption Of Porphyrins Over a Tio 2 Surfacementioning

confidence: 99%

Porphyrins as Active Components for Electrochemical and Photoelectrochemical Devices

Galloni¹,

Vecchi²,

Coletti³

et al. 2014

Handbook of Porphyrin Science

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“…The rate of exchange is much faster on the conventional PAs compared to the PAs with covalently linked dye, which may be responsible for the fast loss in efficiency with air exposure for the former. Figure 7A shows ATR-FTIR spectra of a noncovalent FTO/ TiO 2 /Dye(NC-3) and covalent FTO/TiO 2 /APTES/Dye(C-3) before and after soaking in a 28 mM solution of acetic acid in acetonitrile for 8 h. 58 In this figure, we compared the noncovalent dye attached directly in the dichloromethane solution with DCC and DMAP with the covalently attached dye to determine if there was any difference because they both had a similar peak at 1648 cm −1 . As shown earlier in Figure 3, the ATR-FTIR spectra are very similar before exposure to acetic acid.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Covalent Modification of Photoanodes for Stable Dye-Sensitized Solar Cells

Luitel

2013

Langmuir

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This paper describes the surface modification of TiO 2 with 3-aminopropyltriethoxysilane (APTES) followed by covalent attachment of Ru-based N719 dye molecules to TiO 2 through an amide linkage for use as photoanodes (PAs) in dyesensitized solar cells (DSSCs). Attenuated total reflectance− Fourier transform infrared spectroscopy (ATR-FTIR) confirms the surface chemistry between the TiO 2 and dye. The photovoltaic efficiency of DSSCs with covalently linked dye is very similar (6−7%) to that of traditionally prepared DSSCs prepared by direct immersion when both have similar dye coverage. Importantly, the efficiency of PAs with covalently linked dye did not change after storage for more than 60 days in air, whereas the traditionally prepared PAs decreased dramatically after 1 day and lost most of their efficiency after a week. FTIR and UV−vis characterization of the dye suggests that covalent linkage improves stability by preventing the loss of the thiocyanato ligands and/or tetrabutylammonium cations on the dye. PAs with covalently linked dye are also more stable toward water, acid, heat, and UV light compared to traditionally prepared PAs and are more stable compared to other modified PAs with dye attached through electrostatic or hydrogen-bonding interactions.

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8-Hydroxylquinoline as a strong alternative anchoring group for porphyrin-sensitized solar cells

Abstract: 8-Hydroxylquinoline (OQ) is demonstrated for the first time as a strong alternative anchoring group porphyrin dyes to improve the long-term stability of solar cells.

Cited by 108 publications

References 15 publications

Molecular engineering of cocktail co-sensitization for efficient panchromatic porphyrin-sensitized solar cells

Molecular engineering of cocktail co-sensitization for efficient panchromatic porphyrin-sensitized solar cells

Porphyrins as Active Components for Electrochemical and Photoelectrochemical Devices

Covalent Modification of Photoanodes for Stable Dye-Sensitized Solar Cells

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