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Shaik Mohammed Zakeeruddin

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Publications associées (534)

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

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

Enhancement of the performance of dye-sensitized solar cell by formation of shallow transport levels under visible light illumination

Michael Graetzel, Shaik Mohammed Zakeeruddin

The performance enhancement of dye-sensitized solar cells (DSCs) in lithium-free and lithium-containing electrolytes under visible light-soaking was examined by impedance spectroscopy and photovoltage transient decay measurements. The improvement was found ...

2008

Tetrahydrothiophenium-based ionic liquids for high efficiency dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mingkui Wang, Yiming Cao, Peng Wang

Binary melts of S-ethyltetrahydrothiophenium iodide and dicyanoamide (or tricyanomethide) have been employed for dye-sensitized solar cells with high power conversion efficiencies up to 6.9% under the illumination of AM 1.5G full sunlight. We have further ...

2008

A new strategy of molecular overcharge protection shuttles for lithium ion batteries

Michael Graetzel, Shaik Mohammed Zakeeruddin

The conventional strategy of overcharge protection for lithium ion batteries uses redox molecules having oxidation potential higher than the cathodic materials in the electrolyte. Here we propose a novel approach by using redox molecules having reduction p ...

Elsevier2008

New Efficiency Records for Stable Dye-Sensitized Solar Cells with Low-Volatility and Ionic Liquid Electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nuttapol Pootrakulchote, Peng Wang, Jin Guo

We report a high molar extinction coefficient heteroleptic polypyridyl ruthenium sensitizer, featuring an electron-rich 3,4-ethylenedioxythiophene unit in its ancillary ligand. A nanocrystalline titania film stained with this sensitizer shows an improved o ...

2008

High-Performance Liquid and Solid Dye-Sensitized Solar Cells Based on a Novel Metal-Free Organic Sensitizer

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Mingkui Wang, Peng Wang

A new metal-free organic sensitizer (see figure) for high-performance and applicable dye-sensitized solar cells is presented. In combination with a solvent-free ionic liquid electrolyte, a similar to 7% cell made with this sensitizer shows all excellent st ...

Wiley2008

CdSe quantum dot-sensitized solar cells exceeding efficiency 1% at full-sun intensity

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Peter Chen, Jun Ho Yum

Colloidal cadmium selenide (CdSe) quantum dots QDs) have been prepared and exploited as inorganic dyes to sensitize a large-band-gap TiO2 layer for QD-sensitized solar cells. The optimized QD-sensitized solar cells exhibited an unprecedented incident photo ...

2008

Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Mingkui Wang, Peng Wang

We report two new heteroleptic polypyridyl ruthenium complexes, coded C101 and C102, with high molar extinction coefficients by extending the pi-conjugation of spectator ligands, with a motivation to enhance the optical absorptivity of mesoporous titania f ...

2008

A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cell

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Mingkui Wang, Dan Shi, Yi Wang

A heteroleptic polypyridyl ruthenium complex, cis-Ru(4,4-bis(5-octylthieno[3,2-b]thiophen-2-yl)-2,2-bipyridine)(4,4-dicarboxyl-2,2-bipyridine)(NCS)2, with a high molar extinction coefficient of 20.5 × 103 M-1 cm-1 at 553 nm has been synthesized and demonst ...

Royal Society of Chemistry2008

New Organic Sensitizer for Stable Dye-Sensitized Solar Cells with Solvent-Free Ionic Liquid Electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nuttapol Pootrakulchote, Yiming Cao, Peng Wang

We report a high molar extinction coefficient metal-free sensitizer composed of a triarylamine donor in combination with the 2-(2,2'-bithiophen-5-yl)acrylonitrile conjugation unit and cyanoacrylic acid as an acceptor. In conjugation with a volatile acetoni ...

2008

Bifacial dye-sensitized solar cells based on an ionic liquid electrolyte

Pascal Comte, Michael Graetzel, Paul Liska, Shaik Mohammed Zakeeruddin

Solar energy is a promising solution to global energy-related problems because it is clean, inexhaustible and readily available. However, the deployment of conventional photovoltaic cells based on silicon is still limited by cost, so alternative, more cost ...

Nature Publishing Group2008

High-performance dye-sensitized solar cells based on solvent-free electrolytes produced from eutectic melts

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

2008

A new ion-coordinating ruthenium sensitizer for mesoscopic dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Henry Snaith

2008

Organic Dye-Sensitized Ionic Liquid Based Solar Cells: Remarkable Enhancement in Performance through Molecular Design of Indoline Sensitizers

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker

Wiley-VCH Verlag GmbH2008

Energy-Level and Molecular Engineering of Organic D-pi-A Sensitizers in Dye-Sensitized Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nuttapol Pootrakulchote, Peng Wang, Jin Guo

A series of organic D-pi-A sensitizers composed of different triarylamine donors in conjugation with the thienothiophene unit and cyanoacrylic acid as an acceptor has been synthesized at a moderate yield. Through tuning the number of methoxy substituents o ...

2008

Controlling Phosphorescence Color and Quantum Yields in Cationic Iridium Complexes: A Combined Experimental and Theoretical Study

Michael Graetzel, Kuppuswamy Kalyanasundaram, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Nicholas Evans, Filippo de Angelis

2007

Novel Nano-Structured Silica-Based Electrolytes Containing Quaternary Ammonium Iodide Moieties

Michael Graetzel, Shaik Mohammed Zakeeruddin

A series of new hybrid organic-inorganic molecules were prepared either by grafting of aminopropyltriethoxysilane (APTS) on silica nanoparticles followed by quaternarization of the nitrogen with ethyl, heptyl and isopropyl iodides or by grafting of N,N,N-t ...

2007

High Molar Extinction Coefficient Ion-Coordinating Ruthenium Sensitizer for Efficient and Stable Mesoscopic Dye-Sensitized Solar Cells

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

Ru(4,4-dicarboxylic acid-2,2'-bipyridine) (4,4'-bis(2-(4-(1,4,7,10-tetraoxyundecyl)phenyl)ethenyl)-2,2'-bipyridine) (NCS)(2), a new high molar extinction coefficient ion-coordinating ruthenium sensitizer was synthesized and characterized using H-1 NMR, Fou ...

Wiley-Blackwell2007

High Effiiciency and Stable Mesoscopic Dye-Sensitized Solar Cells based on a High Molar Extinction Cofficient Ru-sensitizer and non-volatile electrolyte

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Carole Graetzel, Robin Humphry-Baker, Nicholas Evans

Wiley2007

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