Plastic and Solid-state Dye-sensitized Solar Cells Incorporating Single-wall Carbon Nanotubes

Ikeda, Nobuyuki; Miyasaka, Tsutomu

doi:10.1246/cl.2007.466

Cited by 44 publications

(27 citation statements)

References 17 publications

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“…In this context, significant efforts have been made to improve the cell performance by modifying TiO 2 electrodes with CNTs. [18,[76][77][78][79] In a DSSC, the thickness of the TiO 2 nanoparticle layer typically lies within the 10-30 micrometer range, because this is necessary to have enough surface area to allow a good dispersion of the adsorbed dye and generate a good photocurrent. However, owing to the limited charge transport in an assembly of TiO 2 nanoparticles and the presence of trapping sites, particularly at the grain boundaries between nanoparticles, a limiting factor for the efficiency is the rate of electron transport from the oxide particles to the back electron collector.…”

Section: Carbon Nanotubes For Dye-sensitized Solar Cellsmentioning

confidence: 99%

Carbon Nanotubes for Sustainable Energy Applications

Centi

2011

ChemSusChem

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The grand challenge of a sustainable production and use of energy has focused research on the nanostructure of materials. This aspect is considered of critical importance for improving the performance of advanced materials and electrodes to meet demanding expectations. Carbon nanotubes (CNTs) are the first and most-successful example of nanomaterials, and play a central role in the development of advanced solutions for sustainable energy applications. However, notwithstanding the rising scientific and technological interest in CNTs, their use is still largely based on phenomenological observations that miss the complexities of the nanostructure and characteristics of these materials. This Concept paper addresses the need for a rational design of CNTs for energy applications, based on an understanding of the key aspects to be considered for their optimization in different applications such as lithium ion batteries, supercapacitors, solar cells, and fuel cells.

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Section: Carbon Nanotubes For Dye-sensitized Solar Cellsmentioning

confidence: 99%

Carbon Nanotubes for Sustainable Energy Applications

Centi

2011

ChemSusChem

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“…[7][8][9][10][11][12][13][14] For this application, and considering the optical spectra of SWCNT, it is necessary to combine SWCNTs with an appropriate dye to act as light harvester. [8,9,13,[15][16][17] In solar cell technology, ruthenium polypyridyl complexes are the universal dyes to harvest sunlight in dye-sensitized semiconductor solar cells (DSSCs). [18][19][20][21][22][23][24][25] The high efficiency of current DSSCs depends largely on the ability of ruthenium polypyridyl complexes to absorb a broad region of the solar spectrum, leading to a fast and efficient electron injection into the semiconductor conduction band.…”

Section: Introductionmentioning

confidence: 99%

Two‐Photon Chemistry in Ruthenium 2,2′‐Bipyridyl‐Functionalized Single‐Wall Carbon Nanotubes

Martín¹,

Jiménez²,

Álvaro³

et al. 2010

Chemistry A European J

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Ruthenium polypyridyl complexes are widely used as light harvesters in dye-sensitized solar cells. Since one of the potential applications of single-wall carbon nanotubes (SWCNTs) and their derived materials is their use as active components in organic and hybrid solar cells, the study of the photochemistry of SWCNTs with tethered ruthenium polypyridyl complexes is important. A water-soluble ruthenium tris(bipyridyl) complex linked through peptidic bonds to SWCNTs (Ru-SWCNTs) was prepared by radical addition of thiol-terminated SWCNT to a terminal C=C double bond of a bipyridyl ligand of the ruthenium tris(bipyridyl) complex. The resulting macromolecular Ru-SWCNT (approximately 500 nm, 15.6% ruthenium complex content) was water-soluble and was characterized by using TEM, thermogravimetric analysis, chemical analysis, and optical spectroscopy. The emission of Ru-SWCNT is 1.6 times weaker than that of a mixture of [Ru(bpy)(3)](2+) and SWCNT of similar concentration. Time-resolved absorption optical spectroscopy allows the detection of the [Ru(bpy)(3)](2+)-excited triplet and [Ru(bpy)(3)](+). The laser flash studies reveal that Ru-SWCNT exhibits an unprecedented two-photon process that is enabled by the semiconducting properties of the SWCNT. Thus, the effect of the excitation wavelength and laser power on the transient spectra indicate that upon excitation of two [Ru(bpy)(3)](2+) complexes of Ru-SWCNT, a disproportionation process occurs leading to delayed formation of [Ru(bpy)(3)](+) and the performance of the SWCNT as a semiconductor. This two-photon delayed [Ru(bpy)(3)](+) generation is not observed in the photolysis of [Ru(bpy)(3)](3+); SWCNT acts as an electron wire or electron relay in the disproportionation of two [Ru(bpy)(3)](2+) triplets in a process that illustrates that the SWCNT plays a key role in the process. We propose a mechanism for this two-photon disproportionation compatible with i) the need for high laser flux, ii) the long lifetime of the [Ru(bpy)(3)](2+) triplets, iii) the semiconducting properties of the SWNT, and iv) the energy of the HOMO/LUMO levels involved.

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“…Power conversion efficiency of the cell (effective area, 0.24 cm 2 ) reached 1.63% (V oc ¼ 0:66 V) under 100 mW cm À2 irradiance. 40 This flexible plastic cell gave a maximum IPCE of 30-35%. Table 1 shows the I-V performance parameters for SWCNT and MWCNT-based full plastic cells.…”

Section: ç Full-plastic Carbon-based Solar Cellsmentioning

confidence: 94%

“…40 The PACB-EOI composite yielded conversion efficiency less than 1%, which was unexpectedly low as the result of replacing the FTO glass with ITO-PEN. However, we found the cell performance is dramatically improved by selecting carbon nanotubes as conductors instead of using the polymer-carbon hybrid materials.…”

Section: ç Full-plastic Carbon-based Solar Cellsmentioning

confidence: 97%

Light Energy Conversion and Storage with Soft Carbonaceous Materials that Solidify Mesoscopic Electrochemical Interfaces

Miyasaka¹,

Ikeda²,

Murakami³

et al. 2007

Chemistry Letters

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Photoactive interfaces created by mesoscopic materials realize high-efficiency light to electric conversion as achieved by dye-sensitized photoelectrodes. Combinaiton of soft carbon composite materials with the mesoscopic interfaces enables solidification of the electrochemical charge-transfer interfaces and incorporation of energy storage function. New approaches for solid-state photoelectrochemistry are described.

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Plastic and Solid-state Dye-sensitized Solar Cells Incorporating Single-wall Carbon Nanotubes

Cited by 44 publications

References 17 publications

Carbon Nanotubes for Sustainable Energy Applications

Carbon Nanotubes for Sustainable Energy Applications

Two‐Photon Chemistry in Ruthenium 2,2′‐Bipyridyl‐Functionalized Single‐Wall Carbon Nanotubes

Light Energy Conversion and Storage with Soft Carbonaceous Materials that Solidify Mesoscopic Electrochemical Interfaces

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