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Michael Graetzel

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Publications associées (1 223)

Future Development of Technology in Dye-Sensitized Solar Cells

Michael Graetzel

2011

Highly active oxide photocathode for photoelectrochemical water reduction

Michael Graetzel, Vincent Laporte, Kevin Sivula, Adriana Paracchino

A clean and efficient way to overcome the limited supply of fossil fuels and the greenhouse effect is the production of hydrogen fuel from sunlight and water through the semiconductor/water junction of a photoelectrochemical cell, where energy collection a ...

Nature Publishing Group2011

Improving the Electrochemical Activity of LiMnPO4 Via Mn-Site Substitution

Michael Graetzel, Nam Hee Kwon, Mingkui Wang

HPL SA report the modification of the electrochemical performance of lithium manganese phosphate (LiMnPO4) via Mn-site bivalent substitution. Manganese (10%) is substituted with iron, nickel, magnesium, or zinc. These substituents are shown via an X-ray to ...

2010

High-Efficiency Solid-State Dye-Sensitized Solar Cells: Fast Charge Extraction through Self-Assembled 3D Fibrous Network of Crystalline TiO2 Nanowires

László Forró, Michael Graetzel, Shaik Mohammed Zakeeruddin, Arnaud Magrez, Laurent Gabriel Félix Alexandre Stéphane Bungener, Jérémie Minh-Châu Brillet, Nicolas Tétreault, Rita Smajda, Endre Horvath, Thomas Moehl, Peng Wang

Herein, we present a novel morphology for solid-state dye-sensitized solar cells based on the simple and straightforward self-assembly of nanorods into a 3D fibrous network of fused single-crystalline anatase nanowires. This architecture offers a high roug ...

American Chemical Society2010

Doping a TiO2 Photoanode with Nb5+ to Enhance Transparency and Charge Collection Efficiency in Dye-Sensitized Solar Cells

Pascal Comte, Michael Graetzel, Shaik Mohammed Zakeeruddin, Aravind Kumar Chandiran

The optoelectronic properties of our benchmark nanocrystalline anatase TiO2 photoanode were modified by means of aliovalent doping with Nb5+. Even for a low doping level, the charge collection efficiency can be noticeably improved as a result of a higher e ...

American Chemical Society2010

High molecular extinction coefficient metal dyes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Peng Wang

The present invention relates to novel compounds that are useful as ligands in organometallic dyes. More particularly, the invention relates to dyes comprising the compounds, said dyes being sensitizing dyes useful in solar cell technology. According to an ...

2010

Organic sensitizers

Michael Graetzel, Shaik Mohammed Zakeeruddin, Peng Wang, Hao Qin

The present invention relates to new organic sensitizer compounds and to photoelectric conversion devices, in particular dye-sensitised solar cells comprising the new sensitizers. The present invention also relates to flexible photoelectric conversion devi ...

2010

Synthesis, characterisation and biological properties of gold(iii) compounds with modified bipyridine and bipyridylamine ligands

Michael Graetzel, Shaik Mohammed Zakeeruddin, Rosario Scopelliti, Paul Joseph Dyson, Angela Casini, Mariam-Céline Diawara

Square planar gold(iii) complexes that contain functionalised bipyridine ligands of general formula [Au(NN)Cl2][PF6] [where NN = 2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine, 4,4'-dimethoxy-2,2'-bipyridine and 4,4'-diamino-2,2'-bipyridine] have been prep ...

Royal Society of Chemistry2010

Effect of heat and light on the performance of dye-sensitized solar cells based on organic sensitizers and nanostructured TiO2

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Jun Ho Yum

The dye-sensitized solar cells based on the functionalized organic sensitizer, 3-(5-(5-(4-(bis(4-(hexyloxy)-phenyl)amino)phenyl)thiophen-2-yl)thiophen-2-yl)-2-cyanoacrylic acid (D21L6) exhibit comparable stability to the ruthenium sensitizers under 60 degr ...

Elsevier2010

Efficient Electron Transfer and Sensitizer Regeneration in Stable π-Extended Tetrathiafulvalene-Sensitized Solar Cells

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Joël Teuscher, Davide Di Censo, Sophie Wenger, Qianli Chen

The development of metal-free organic sensitizers is a key issue in dye-sensitized solar cell research. We report successful photovoltaic conversion with a new class of stable tetrathiafulvalene derivatives, showing surprising electrochemical and kinetic p ...

American Chemical Society2010

An inconvenient influence of iridium(III) isomer on OLED efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Davide Di Censo, Filippo de Angelis

The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)(2)(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, D ...

Royal Society of Chemistry2010

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

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

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

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

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Xiaoqing Jiang

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

Artificial photosynthesis: biomimetic approaches to solar energy conversion and storage

Michael Graetzel, Kuppuswamy Kalyanasundaram

Using sun as the energy source, natural photosynthesis carries out a number of useful reactions such as oxidation of water to molecular oxygen and fixation of CO2 in the form of sugars. These are achieved through a series of light-induced multielectron-tra ...

Elsevier2010

Synthesis of mesoporous titanium dioxide by soft template based approach: characterization and application in dye-sensitized solar cells

Michael Graetzel

The present work demonstrates the usefulness of the soft-template directed approach in preparing mesoporous titanium dioxide and applying it in dye-sensitized solar cells (DSSCs). Mesoporous titanium dioxide with nanograins of dimension in the range, 16-20 ...

Royal Society of Chemistry2010

An organic redox electrolyte to rival triiodide/iodide in dye-sensitized solar cells

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Mingkui Wang

Dye-sensitized solar cells (DSCs) have achieved impressive conversion efficiencies for solar energy of over 11% with an electrolyte that contains triiodide/iodide as a redox couple. Although triiodide/iodide redox couples work efficiently in DSCs, they suf ...

2010

Dye-Sensitized Solar Cells Employing a Single Film of Mesoporous TiO2 Beads Achieve Power Conversion Efficiencies Over 10%

Pascal Comte, Michael Graetzel, Leo-Philipp Heiniger

Dye-sensitized solar cells employing mesoporous TiO2 beads have demonstrated longer electron diffusion lengths and extended electron lifetimes over Degussa P25 titania electrodes due to the well interconnected, densely packed nanocrystalline TiO2 particles ...

American Chemical Society2010

Light-Induced Water Splitting with Hematite: Improved Nanostructure and Iridium Oxide Catalysis

Michael Graetzel, Maurin Cornuz, Kevin Sivula, Stanley David Tilley

Revved-up rust! Light-induced water splitting over iron oxide (hematite) has been achieved by using a particle-assisted deposition technique and IrO2-based surface catalysis. Photocurrents in excess of 3 mA cm-2 were obtained at +1.23 V versus the reversib ...

Wiley-VCH Verlag GmbH2010

Efficient Platinum-Free Counter Electrodes for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

Nanoporous layers of poly(3,4-propylenedioxythiophene) (PProDOT) were fabricated by electrical-field-assisted growth using hydrophobic ionic liquids as the growing medium. A series of PProDoT layers was prepared with three different ionic liquids to contro ...

2010

Theoretical Screening of -NH2-, -OH-, -CH3-, -F-, and -SH-Substituted Porphyrins As Sensitizer Candidates for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Xiaoyu Zhang

Following former Studies, the donor-acceptor combinations of -NH2-substituted porphyrin donor and the acceptors C, D, E, F, H and G, those of -OH-, -CH3- and -Ph-substituted porphyrins as well as porphine donors and the acceptors E, G. and H, and those of ...

American Chemical Society2010

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