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Michael Graetzel

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Publications associées (1 223)

White-light phosphorescence emission from a single molecule: application to OLED

Michael Graetzel, Kuppuswamy Kalyanasundaram, Mohammad Khaja Nazeeruddin, Filippo de Angelis

A simple mononuclear cyclometallated iridium(III) complex exhibits white photo- and electro-luminescence in the wavelength range from 440 to 800 nm, which originates from a single emitting excited state of mixed character. ...

Royal Society of Chemistry2009

PbS and US Quantum Dot-Sensitized Solid-State Solar Cells: "Old Concepts, New Results"

Michael Graetzel, Mohammad Khaja Nazeeruddin, Frank Nüesch, Shaik Mohammed Zakeeruddin, Thomas Geiger, Peter Chen, Soo-Jin Moon

2009

Passivation of nanocrystalline TiO2 junctions by surface adsorbed phosphinate amphiphiles enhances the photovoltaic performance of dye sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Péter Kalman Péchy, Mingkui Wang, Xuan Li

We report a new class of molecular insulators that electronically passivate the surface of nanocrystalline titania films for high performance dye sensitized solar cells (DSC). Using electrical impedance measurements we demonstrate that co-adsorption of din ...

2009

“Brick and Mortar” Strategy for the Formation of Highly Crystalline Mesoporous Titania Films from Nanocrystalline Building Blocks

Michael Graetzel, Shaik Mohammed Zakeeruddin, Sophie Wenger

We present a novel “brick and mortar” strategy for creating highly efficient transparent TiO2 coatings for photocatalytic and photovoltaic applications. Our approach is based on the fusion of preformed titania nanocrystalline “bricks” through surfactant-te ...

2009

The 2,2,6,6-Tetramethyl-1-piperidinyloxy Radical: An Efficient, Iodine-Free Redox Mediator for Dye-Sensitized Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Peter Chen

2008

Fabrication of thin film dye sensitized solar cells with solar to electric power conversion efficiency over 10%

Pascal Comte, Michael Graetzel, Paul Liska, Mohammad Khaja Nazeeruddin, Carole Graetzel

Techniques of TiO2 film fabrication for dye-sensitized solar cells having a conversion efficiency of global air mass 1.5 (AM 1.5, 1000 W/m(2)) solar light to electric power over 10% are reported. Newly implemented fabrication technologies consist of pre-tr ...

2008

Molecular Engineering of Organic Sensitizers for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Ulf Anders Hagfeldt, Jun Ho Yum, Filippo de Angelis

Novel unsym. org. sensitizers comprising donor, electron-conducting and anchoring groups were engineered at a mol. level and synthesized for sensitization of mesoscopic TiO2 injection solar cells. The unsym. org. sensitizers 3-(5-(4-(diphenylamino)styryl)t ...

2008

Molecular Wiring of Olivine LiFeP04 by Ruthenium(II)-Bipyridine Complexes and by Their Assemblies with Single-Walled Carbon Nanotubes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ladislav Kavan

The undoped and carbon-free olivine, LiFePO4 was bonded with 5% PVDF, and deposited on F-doped SnO2 support (FTO). The electrodes were modified by a monolayer of three different complexes: NaRu(4,4′-dicarboxylic acid-2,2′-bipyridine)(4,4′-dinonyl-2,2′-bipy ...

2008

Application of Highly Ordered TiO2 Nanotube Arrays in Flexible Dye-Sensitized Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Peter Chen, Jérémie Minh-Châu Brillet

2008

New functional triethoxysilanes as iodide sources for dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin

Three new triethoxysilanes bearing quaternary ammonium alkyl iodides are reported, N,N,N-triethyl-3-(triethoxysilyl)propan-1-aminium iodide 1, N,N,N-triheptyl-3-(triethoxysilyl)propan-1-aminium iodide 2 and N,N,N-tridodecyl-3-(triethoxysilyl)propan-1-amini ...

2008

An Organic Sensitizer with a Fused Dithienothiophene Unit for Efficient and Stable Dye-Sensitized Solar Cells

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

We report a high molar extinction coefficient organic sensitizer for high efficiency dye-sensitized solar cells. In combination with a solvent-free ionic liquid electrolyte, we have demonstrated a 7% cell showing an excellent stability measured under the t ...

2008

Dye-sensitized solar cells with solvent-free ionic liquid electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Yu Bai, Yiming Cao, Peng Wang

We systematically studied the temperature-dependent physicochemical properties, such as density, conductivity, and fluidity, of 1,3-dialkylimidazolium iodides. In combination with the amphiphilic Z907Na sensitizer, we have found that it is important to use ...

2008

Synthesis, Characterization, and DFT/TD-DFT Calculations of Highly Phosphorescent Blue Light-Emitting Anionic Iridium Complexes

Michael Graetzel, Kuppuswamy Kalyanasundaram, Mohammad Khaja Nazeeruddin, Davide Di Censo, Nicholas Evans, Filippo de Angelis

2008

Effect of Coadsorbent on the Photovoltaic Performance of Zinc Pthalocyanine-Sensitized Solar Cells

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

2008

An element of surprise - efficient copper-functionalized dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Takeru Bessho

Dye-sensitized solar cells with carboxylate-derivatized {(CuL2)-L-1} complexes are surprisingly efficient and offer a long-term alternative approach to ruthenium-functionalized systems. ...

Royal Society of Chemistry2008

Recent Developments in Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peter Chen, Jun Ho Yum

2008

High Extinction Coefficient "Antenna" Dye in Solid-State Dye-Sensitized Solar Cells: A Photophysical and Electronic Study

Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Joël Teuscher, Henry Snaith

2008

Charge collection and pore filling in solid-state dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Ilkay Cesar, Peter Chen, Henry Snaith

The solar to electrical power conversion efficiency for dye-sensitized solar cells (DSCs) incorporating a solid-state organic hole-transporter can be over 5%. However, this is for devices significantly thinner than the optical depth of the active composite ...

2008

Photoelectrochemical cell and electrolyte for the cell

Michael Graetzel

PROBLEM TO BE SOLVED: To eliminate conventional disadvantages, and to improve the stability of the performance of a cell in the course of time as a function of an operating temperature. ;SOLUTION: A cell including a photoanode composed of at least one poly ...

2008

Alkylpyrrolidiniumtrialkoxysilyl iodides as organic iodide sources for dye-sensitised solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin

Two new alkylpyrrolidiniumtriethoxysilyl iodides have been developed as iodide sources for DSSCs; the compound with an undecyl spacer between the siloxane and the pyrrolidinium moieties furnished higher open circuit voltages than the propyl analogue and hi ...

Royal Society of Chemistry2008

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