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Michael Graetzel

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Publications associées (1 223)

Examining architectures of photoanode-photovoltaic tandem cells for solar water splitting

Michael Graetzel, Maurin Cornuz, Jun Ho Yum, Kevin Sivula, Florian Le Formal, Jérémie Minh-Châu Brillet

Given the limitations of the materials available for photoelectrochemical water splitting, a multiphoton (tandem) approach is required to convert solar energy into hydrogen efficiently and durably. Here we investigate a promising system consisting of a hem ...

Cambridge University Press2010

Novel anchoring ligands for sensitizers of dye-sensitized photovoltaic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Amaresh Mishra

The present invention relates to novel pyridine compounds that can be used as anchoring ligands in metal-based sensitizing dyes of dye sensitized solar cells (DSCs). The dyes comprising the polypyridine compounds exhibit improved light harvesting ability a ...

2010

Preferential Orientation in Hematite Films for Solar Hydrogen Production via Water Splitting

Michael Graetzel, Maurin Cornuz, Kevin Sivula

The state-of-the-art performance, obtained through the reduction of precursor gas residence time in hematite photoanodes produced by APCVD, is explained in this report by an enhanced preferential orientation of the highly conductive crystal planes perpendi ...

2010

Dye, dye-sensitized solar cell, and method for manufacturing the same

Michael Graetzel, Mohammad Khaja Nazeeruddin

PROBLEM TO BE SOLVED: To provide a dye to become a constituting material of a dye-sensitized solar cell having a high conversion efficiency and excelling in the durability. SOLUTION: The dye is represented by formula (1): ML1L2L3 ...

2010

Cyclometallated Iridium Complexes as Sensitizers for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Il Jung, Rosaria Vulcano

Wiley-Blackwell2010

Organized Mesoporous TiO2 Films Stabilized by Phosphorus: Application for Dye-Sensitized Solar Cells

Michael Graetzel, Ladislav Kavan, Jun Ho Yum

A synthetic protocol was developed for the preparation of thin mesoporous TiO2 films with enhanced thermal stability. This objective was achieved by a modification of the procedure of supramolecular templating by a Pluronic P-123 copolymer by an addition o ...

2010

Photoelectrochemical Water Splitting with Mesoporous Hematite Prepared by a Solution-Based Colloidal Approach

Michael Graetzel, Kevin Sivula, Florian Le Formal

Sustainable hydrogen production through photoelectrochemical water splitting using hematite (alpha-Fe2O3) is a promising approach for the chemical storage of solar energy, but is complicated by the material's nonoptimal optoelectronic properties. Nanostruc ...

American Chemical Society2010

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

Michael Graetzel, 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

Hierarchical TiO2 Photoanode for Dye-Sensitized Solar Cells

Pascal Comte, Michael Graetzel

Hierarchical or one-dimensional architectures are among the most exciting developments in material science these recent years We present a nanostructured TiO2 assembly combining these two concepts and resembling a forest composed of individual, high aspect ...

American Chemical Society2010

Ultrafast charge transfer through p-oligo(phenylene) bridges: effect of nonequilibrium vibrations

Serge Pelet, Bernard Wenger, Pascal Comte, Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Joël Teuscher, Christophe Bauer

Electron transfers (ET) between a donor (D) and an acceptor (A) through a molecular bridge (B) are of great importance in biological systems, molecular electronics and molecular based light-energy conversion systems. Here, the back and the forward electron ...

Current Science Assoc // Indian Academy of Sciences2010

Controlling Photoactivity in Ultrathin Hematite Films for Solar Water-Splitting

Michael Graetzel, Kevin Sivula, Florian Le Formal

A promising route to increase the performance of hematite (alpha-Fe2O3) photoelectrodes for solar hydrogen production through water-splitting is to use an extremely thin layer of this visible light absorber on a nanostructured scaffold. However, the typica ...

Wiley-Blackwell2010

Dopamine Adsorption on Anatase TiO2(101): A Photoemission and NEXAFS Spectroscopy Study

Michael Graetzel

The adsorption of dopamine onto an anatase TiO2(101) single crystal has been studied using photoemission and NEXAFS techniques Photoemission Jesuits suggest that the dopamine molecule adsorbs on the surface in a bidentate geometry, resulting in the removal ...

American Chemical Society2010

Transport and Interfacial Transfer of Electrons in Dye-Sensitized Solar Cells Utilizing a Co(dbbip)(2) Redox Shuttle

Michael Graetzel, Shaik Mohammed Zakeeruddin

The transport and interfacial transfer of electrons in dye-sensitized solar cells utilizing the Co(dbbip)(2) (dbbip = 2,6-bis(l'-butylbenzimidazol-2'-yl)pyridine) redox couple as an alternative to the conventional I-3(-)/l(-) couple have been investigated ...

American Chemical Society2010

Enhanced Electron Collection Efficiency in Dye-Sensitized Solar Cells Based on Nanostructured TiO2 Hollow Fibers

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Elham Ghadiri

Nanostructured TiO2 hollow fibers have been prepared using natural cellulose fibers as a template. This cheap and easily processed material was used to produce highly porous photoanodes incorporated in dye-sensitized solar cells and exhibited remarkably en ...

American Chemical Society2010

Sb2S3-Based Mesoscopic Solar Cell using an Organic Hole Conductor

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jun Ho Yum, Soo-Jin Moon

Solid-state nanocrystalline solar cells composed of chemical-bath-deposited Sb2S3 (antimony sulfide) as a light absorber layer deposited on nano-porous TiO2 and spiro-MeOTAD as an organic hole-transporting material yielded a solar conversion efficiency of ...

2010

High-Performance Nanostructured Inorganic-Organic Heterojunction Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yonghui Lee

We report all solid-state nanostructured inorganic-organic heterojuncuon solar cells fabricated by depositing Sb2S3 and poly(3-hexylthiophene) (P3HT) on the surface of a mesoporous TiO2 layer, where Sb2S3 acts as an absorbing semiconductor and P3HT acts as ...

American Chemical Society2010

Deposition of hole-transport materials in solid-state dye-sensitized solar cells by doctor-blading

Michael Graetzel, Shaik Mohammed Zakeeruddin

We report using doctor-blading to replace conventional spin coating for the deposition of the hole-transport material spiro-OMeTAD (2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene) in solid-state dye-sensitized solar cells. Doctor-bla ...

Elsevier2010

Enhanced-Light-Harvesting Amphiphilic Ruthenium Dye for Efficient Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Carole Graetzel, Robin Humphry-Baker, Soo-Jin Moon, Mingkui Wang, Florian Le Formal, Peng Wang

A ruthenium sensitizer (coded C101, NaRu (4,4'-bis(5-hexylthiophen-2-yl)-2,2'-bipyridine) (4-carboxylic acid-4'-caboxylate-2,2'-bipyridine) (NCS)(2)) containing a hexylthiophene-conjugated bipyridyl group as an ancillary ligand is presented for use in soli ...

Wiley-Blackwell2010

High Excitation Transfer Efficiency from Energy Relay Dyes in Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Péter Kalman Péchy, Jun Ho Yum

The energy relay dye, 4-(Dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), was used with a near-infrared sensitizing dye, TT1, to increase the overall power conversion efficiency of a dye-sensitized solar cell (DSC) from 3.5% to 4.5%. Th ...

American Chemical Society2010

Modified surface

Michael Graetzel, Shaik Mohammed Zakeeruddin, Péter Kalman Péchy

The present invention relates to modified surfaces. The surfaces comprise an inorganic material on which a phosphinic acid derivative is adsorbed. The phosphinic acid thus turns out to be a new anchoring group useful for surface derivatisation. The inventi ...

2010

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