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Mohammad Khaja Nazeeruddin

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Publications associées (846)

Dual-Emitting Langmuir-Blodgett Film-Based Organic Light-Emitting Diodes

Mohammad Khaja Nazeeruddin, Diego Repetto

Langmuir-Blodgett (LB) films containing alternating layers of the metallosurfactants bis(4,4'-tridecyl-2,2'-bipyridine)-(4,4'-dicarboxy-2,2'-bipyridine) ruthenium(II)-bis(chloride) (1) and bis[2-(2,4-difluorophenyl)pyridine](4,4'-dinonadecyl-2,2'-bipyridin ...

American Chemical Society2010

Dye-sensitized solar cells based on poly (3,4-ethylenedioxythiophene) counter electrode derived from ionic liquids

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Xiaoyu Zhang

Poly (3,4-ethylenedioxythiophene) (PEDOT) nanoporous layers were prepared with electro-oxidative polymerization using room temperature hydrophobic ionic liquids as a medium. The synthesized highly porous PEDOT films exhibit room temperature conductivity va ...

Royal Society of Chemistry2010

Photoelectric conversion devices comprising novel ligands and sensitizers

Michael Graetzel, Mohammad Khaja Nazeeruddin

The present invention provides novel dyes for dye sensitized photovoltaic conversion devices. The dyes contain novel anchoring ligands, which have a vinyl or phenylethenyl moiety incorporated in the anchoring bipyridine. Such dyes exhibit an increased mola ...

2010

Molecular Engineering of Efficient Organic Sensitizers Incorporating a Binary pi-Conjugated Linker Unit for Dye-Sensitized Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek

Six organic sensitizers containing 3,4-ethylenedioxythiophene and thienothiophene in the bridged group are designed and synthesized, which under standard global AM 1.5 solar conditions, the device using JK-184 gave a conversion efficiency of 8.70%. The pho ...

American Chemical Society2010

High Molar Extinction Coefficient Organic Sensitizers for Efficient Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ines Raabe, Jun Ho Yum, Francesca Teocoli

We have designed and synthesized highly efficient organic sensitizers with a planar thienothiophene-vinylene-thienothiophene linker. Under standard global AM 1.5 solar conditions, the JK-113-sensitized cell gave a short circuit photocurrent density (J(sc)) ...

2010

Convenient synthesis of functionalized 4,4 '-disubstituted-2,2 '-bipyridine with extended pi-system for dye-sensitized solar cell applications

Michael Graetzel, Mohammad Khaja Nazeeruddin

Exploration of new ruthenium-based sensitizers for dye-sensitized solar cell (DSC) applications requires an easy access to multifunctionalized ligands for efficient screening of sensitizers' properties. Based on the Horner-Emmons-Wadsworth reaction, a conv ...

Elsevier2010

Molecular engineering of panchromatic unsymmetrical squaraines for dye-sensitized solar cell applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jinhyun Kim

Three unsymmetrical squaraine dyes JK-64, JK-65, and JK-64Hx, containing a bulky spirobifluorene or hexyloxyphenyl unit are designed and synthesized. These sensitizers, when anchored onto a TiO2 surface, exhibit decreased aggregation as well as enhanced un ...

Royal Society of Chemistry2010

Solid-state dye-sensitized solar cells using polymerized ionic liquid electrolyte with platinum-free counter electrode

Michael Graetzel, Mohammad Khaja Nazeeruddin

A polymerized ionic liquid electrolyte and platinum-free counter electrode are employed for solid-state DSSCs. We are able to prepare a thin polymer electrolyte layer on nanocrystalline TiO2 in order to reduce the cell resistance. In addition, an electron ...

2010

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

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

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

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

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

New Paradigm in Molecular Engineering of Sensitizers for Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ursula Röthlisberger, Ivano Tavernelli, Matteo Guglielmi, Takeru Bessho

A novel thiocyanate-free cyclometalleted ruthenium sensitizer for solar cells is designed and developed. Upon anchoring to nanocrystalline TiO2 films, it exhibits a remarkable incident monochromatic photon-to-current conversion efficiency of 83%. The solar ...

2009

A Dendritic Oligothiophene Ruthenium Sensitizer for Stable Dye-Sensitized Solar Cells

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

2009

Efficient CdSe Quantum Dot-Sensitized Solar Cells Prepared by an Improved Successive Ionic Layer Adsorption and Reaction Process

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Peter Chen, Mingkui Wang

In pursuit of efficient quantum dot (OD)-sensitized solar cells based on mesoporous TiO2 photoanodes, a new procedure for preparing selenide (Se2-) was developed and used for depositing CdSe QDs in situ over TiO2 mesopores by the successive ionic layer ads ...

2009

High efficient donor-acceptor ruthenium complex for dye-sensitized solar cell applications

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

A highly efficient heteroleptic ruthenium (II) complex cis-di(thiocyanato)(4,4'-dicarboxylic acid-2,2'-bipyridine)(4,4'-di-(2-(4-ditolylamine phenyl)ethenyl)-2,2'-bipyridine) ruthenium (II) (IJ-1) was synthesized and characterized, which when anchored on n ...

2009

High Molar Extinction Coefficient Ruthenium Sensitizers for Thin Film Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

We present two sensitizers, Ru(4,4'-dicarboxyvinyl)-2,2'-bipyridine)(4,4'-dinonyl-2,2'-bipyridine)(NCS)(2) (K9) and Ru(4,4'-dicarboxy(phenylethenyl)-2,2'-bipyridine)(4,4'-dinonyl-2,2'-bipyridine)(NCS)(2) (K23), which were synthesized and characterized by a ...

2009

Molecular Ionic Junction for Enhanced Electronic Charge Transfer

Mohammad Khaja Nazeeruddin, Diego Repetto

We present the first evidence of charge injection improvement in an organic electroluminescent device provided by a single ionic molecular layer. A hole-dominated, hybrid organic-inorganic light-emitting device is used as a probe to verify the effectivenes ...

American Chemical Society2009

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