Dye Sensitization of the Anatase (101) Crystal Surface by a Series of Dicarboxylated Thiacyanine Dyes

Ushiroda, Shin; Ruzycki, Nancy; Lu, Yilong; Mt, Spitler; Ba, Parkinson

doi:10.1021/ja044001t

Cited by 126 publications

(142 citation statements)

References 42 publications

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“…Keywords: electrochemistry · electron transfer · photochemistry · semiconductors · titanium dioxide case diverse organic dyes (porphyrins, [36][37][38][39][40] phthalocyanines, [41][42][43][44][45] thiacarbocyanine dyes, [46,47] various natural dyes [48][49][50][51][52][53][54][55][56] ) and metal complexes [49] undergo photoexcitation with visible light and inject electrons into the conduction band ( Figure 1b). Chemisorption of chromogenic molecules onto the TiO 2 surface results in formation of ligand-to-metal or metal-to-metal charge transfer (LMCT and MMCT, respectively; more precisely referred to as ligand-to-particle or metal-to-particle charge transfer; LPCT and MPCT) involving surface Ti IV ions and surface-bound ligands or transition-metal complexes, respectively.…”

Section: Introductionmentioning

confidence: 99%

Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative Study

Macyk

Stochel

Szaciłowski

2007

Chemistry A European J

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Selected iron(II) complexes (ferrocene, ferrocenylboronic acid, hexacyanoferrate(II)) have been used as photosensitizers of titanium dioxide. Various types of electronic interactions between the surface complex and the semiconducting support are reflected in different yields of photocurrent generated upon visible-light irradiation and different efficiencies of the photosensitization effect. The studied systems, showing the photocurrent switching upon changes of electrode potential and energy of photons (the PEPS effect), are good models of simple photoelectrochemical logic devices. The mechanism of photosensitization and photocurrent switching is discussed with respect to the type of surface-complex-support interaction. Quantum-mechanical calculations support the proposed mechanisms.

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Section: Introductionmentioning

confidence: 99%

Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative Study

Macyk

Stochel

Szaciłowski

2007

Chemistry A European J

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“…[28,37,38] An inspiration for light-harvesting molecules and antenna systems capable of titania photosensitization comes from various biosystems. [39] There are numerous trials of solar-cell construction which are based on biomolecules and supramolecular systems; for instance, porphyrins, [40][41][42][43][44] phtalocyanines, [45] thiocarbocyanine dyes, [46,47] natural dyes, [48][49][50][51][52][53][54] etc. In every case, the redox-active molecules supply electrons from their excited states.…”

Section: Introductionmentioning

confidence: 99%

Redox‐Controlled Photosensitization of Nanocrystalline Titanium Dioxide

et al. 2006

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Photosensitization of nanocrystalline titanium dioxide materials has been achieved by chemisorption of the pentacyanothiamineferrate(II) complex, which offers a relatively high redox potential that determines the photoelectrochemical properties of the photosensitized TiO(2). The adsorbed pentacyanoferrate complex binds to TiO(2) through the cyanide bridge and forms a new surface complex characterized by a metal-to-metal charge-transfer transition (MMCT) (Fe(II)-->Ti(IV)). The photosensitization can be observed only at low potentials at which Fe(II) moieties are present. Photocurrent switching between anodic and cathodic can be induced by varying either the photoelectrode potential or the wavelength of the incident light. Simple molecular modeling-together with spectroscopic and electrochemical measurements-allows the elucidation of the mechanism of the observed photoelectrochemical behavior.

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“…The heart of this cell is a photoanode, consisting of a nanoporous TiO 2 film covered by a monolayer of photosensitizer. 6 Considerable effort has been devoted to the development of new and efficient sensitizers suitable for practical use, such as coumarin, [7][8][9] indoline, [10][11][12] oligoene, 13,14 thiophene, [15][16][17] triarylamine, [18][19][20] perylene, [21][22][23] cyanine, [24][25][26] phthalocyanine, 27 and hemicyanine derivatives.…”

Section: Introductionmentioning

confidence: 99%

A Zinc Porphyrin Sensitizer Modified with Donor and Acceptor Groups for Dye-Sensitized Solar Cells

Lee¹,

Sarker²,

Hong³

2014

Bulletin of the Korean Chemical Society

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In this article, we have designed and synthesized a novel donor-π-acceptor (D-π-A) type porphyrin-based sensitizer (denoted UI-5), in which a carboxyl anchoring group and a 9,9-dimethyl fluorene were introduced at the meso-positions of porphyrin ring via phenylethynyl and ethynyl bridging units, respectively. Long alkoxy chains in ortho-positions of the phenyls were supposed to reduce the degree of dye aggregation, which tends to affect electron injection yield in a photovoltaic cell. The cyclic voltammetry was employed to determine the band gap of UI-5 to be 1.41 eV based on the HOMO and LUMO energy levels, which were estimated by the onset oxidation and reduction potentials. The incident monochromatic photon-to-current conversion efficiency of the UI-5 DSSC assembled with double-layer (20 nm-sized TiO 2 /400 nm-sized TiO 2 ) film electrodes appeared lower upon overall ranges of the excitation wavelengths, but exhibited a higher value over the NIR ranges (λ = 650-700 nm) compared to the common reference sensitizer N719. The UI-5-sensitized cell yielded a relatively poor device performance with an overall conversion efficiency of 0.74% with a short circuit photocurrent density of 3.05 mA/cm 2, an open circuit voltage of 0.54 mV and a fill factor of 0.44 under the standard global air mass (AM 1.5) solar conditions. However, our report about the synthesis and the photovoltaic characteristics of a porphyrin-based sensitizer in a D-π-A structure demonstrated a significant complex relationship between the sensitizer structure and the cell performance.

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Dye Sensitization of the Anatase (101) Crystal Surface by a Series of Dicarboxylated Thiacyanine Dyes

Cited by 126 publications

References 42 publications

Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative Study

Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative Study

Redox‐Controlled Photosensitization of Nanocrystalline Titanium Dioxide

A Zinc Porphyrin Sensitizer Modified with Donor and Acceptor Groups for Dye-Sensitized Solar Cells

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