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4,4' Functionalized 2,2'-Bipyridines

Publications associées (88)

Panchromatic engineering for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Sophie Wenger

The dye-sensitized mesoscopic solar cell has been intensively investigated as a promising photovoltaic cell. Its ecological and economical fabrication processes make it attractive and credible alternative to conventional photovoltaic systems. In contrast t ...

2011

Characterization of the Interface Properties and Processes in Solid State Dye-Sensitized Solar Cells Employing a Perylene Sensitizer

Ulf Anders Hagfeldt

A perylene sensitizer, ID176, was recently reported which performs much better in solid state dye-sensitized solar cells than in those using liq. electrolytes with iodide/tri-iodide as the redox couple. Here, a characterization is presented of the sensitiz ...

2011

Phenoxazine dyes for dye-sensitized solar cells: relationship between molecular structure and electron lifetime

Xiaoqing Jiang, Ulf Anders Hagfeldt

A series of metal-free organic dyes with a core phenoxazine chromophore have been synthesized and tested as sensitizers in dye-sensitized solar cells. Overall conversion efficiencies of 6.03-7.40% were reached under standard AM 1.5G illumination at a ligh ...

2011

Absorption Spectra and Excited State Energy Levels of the N719 Dye on TiO2 in Dye-Sensitized Solar Cell Models

Michael Graetzel, Mohammad Khaja Nazeeruddin, Filippo de Angelis

We have investigated the absorption spectrum and the alignment of ground and excited state energies for the prototypical N719 Ru(II) sensitizer adsorbed on an extended TiO2 model by means of high level DFT/TDDFT calculations. The calculated and experimenta ...

American Chemical Society2011

Norland optical adhesive (NOA81) microchannels with adjustable wetting behavior and high chemical resistance against a range of mid-infrared-transparent organic solvents

Nico de Rooij, Philip Wägli

Different methods to adjust the wetting behavior of surfaces of the UV-curable adhesive NOA81 were investigated and quantitatively characterized by dynamic contact angle measurements with an optical goniometer. A new method to make NOA81 surfaces hydrophob ...

Elsevier2011

The Influence of Local Electric Fields on Photoinduced Absorption in Dye-Sensitized Solar Cells

Ulf Anders Hagfeldt

The dye-sensitized solar cell (DSC) challenges conventional photovoltaics with its potential for low-cost prodn. and its flexibility in terms of color and design. Transient absorption spectroscopy is widely used to unravel the working mechanism of DSCs. A ...

2010

Molecular design of metal-free D–π-A substituted sensitizers for dye-sensitized solar cells

Shaik Mohammed Zakeeruddin, Jacques-Edouard Moser, Mingkui Wang, Robin Humphry-Baker, Joël Teuscher, Davide Di Censo, Nuttapol Pootrakulchote, Yuxiang Yu, Leila Alibabaei

Novel donor-p-acceptor (D--A) dyes, coded as SD-1, SD-2 and SD-5, were designed and synthesized for dye-sensitized solar cells. All these dyes comprised the same donor and acceptor units while the oligo thiophene units were introduced as linkers between th ...

2010

Strategies to Optimizing Dye-Sensitized Solar Cells

Sophie Wenger

Dye-sensitized solar cells (DSCs) constitute a novel class of hybrid organic-inorganic solar cells. At the heart of the device is a mesoporous film of titanium dioxide (TiO2) nanoparticles, which are coated with a monolayer of dye sensitive to the visible ...

EPFL2010

D-π-A Sensitizers for Dye-Sensitized Solar Cells: Linear vs Branched Oligothiophenes

Shaik Mohammed Zakeeruddin, Mingkui Wang, Sophie Wenger, Amaresh Mishra

Two donor-π-acceptor (D-π-A) dyes, coded as L-3T-DPA 1 and B-5T-DPA 2, were synthesized for application in dye-sensitized solar cells. These D-π-A sensitizers use diphenylamine as donor, an oligothiophene as π-bridge, and cyanoacrylic acid as an acceptor g ...

American Chemical Society2010

Surface Molecular Quantification and Photoelectrochemical Characterization of Mixed Organic Dye and Coadsorbent Layers on TiO2 for Dye-Sensitized Solar Cells

Shaik Mohammed Zakeeruddin, Xiaoqing Jiang, Ulf Anders Hagfeldt

Different molecular layers on TiO2 were prepared by using the p-dimethylaniline triphenylamine based organic dye, D29, together with the coadsorbents decylphosphonic acid (DPA), dineohexyl bis(3,3-dimethylbutyl)phosphinic acid (DINHOP), and chenodeoxycholi ...

American Chemical Society2010

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