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Mohammad Khaja Nazeeruddin

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Publications associées (846)

Semiconductor electrode comprising a blocking layer

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

The present invention provides a porous semiconductor electrode passivated by way of a layer applied by an atomic layer deposition (ALD) process. The semiconductor electrode can be advantageously used in dye-sensitized solar cells (DSCs) having increase op ...

2013

Low Current Density Driving Leads to Efficient, Bright, and Stable Green Electroluminescence

Mohammad Khaja Nazeeruddin, Julien Edouard Frey

Electroluminescent devices have the potential to reshape lighting and display technologies by providing low-energy consuming solutions with great aesthetic features, such as flexibility and transparency. In particular, light-emitting electrochemical cells ...

Wiley-VCH Verlag Berlin2013

Harnessing the open-circuit voltage via a new series of Ru(II) sensitizers bearing (iso-)quinolinyl pyrazolate ancillaries

Michael Graetzel, Mohammad Khaja Nazeeruddin, Kuan-Lin Wu

A novel class of Ru(II) sensitizers (TFRS-51-TFRS-54) with a 4,40'-dicarboxy-2,2'-bipyridine anchoring ligand and two trans-oriented isoquinolinyl (or quinolinyl) pyrazolate ancillaries were designed, characterized and used to fabricate dye sensitized sola ...

Royal Society of Chemistry2013

The Role of p Bridges in High-Efficiency DSCs Based on Unsymmetrical Squaraines

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Elisa Dell'Orto

A series of squaraine-based sensitizers with various p bridges and anchors were prepared and examined in dye-sensitized solar cells. The carboxylic anchor group was attached onto a squaraine dye through p bridges with and without an ethynyl spacer. DFT stu ...

Wiley-Blackwell2013

Regeneration and recombination kinetics in cobalt polypyridine based dye-sensitized solar cells, explained using Marcus theory

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt

Regeneration and recombination kinetics was investigated for dye-sensitized solar cells (DSCs) using a series of different cobalt polypyridine redox couples, with redox potentials ranging between 0.34 and 1.20 V vs. NHE. Marcus theory was applied to explai ...

Royal Society of Chemistry2013

High Open-Circuit Voltages: Evidence for a Sensitizer-Induced TiO2 Conduction Band Shift in Ru(II)-Dye Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Hoi Nok Tsao, Kuan-Lin Wu, Filippo de Angelis

Dye-sensitized solar cells (DSC) represent a valuable, efficient, and low-cost alternative to conventional semiconductor photovoltaic devices. A deeper understanding of the interactions at the dye/semiconductor heterointerface is fundamental for future pro ...

American Chemical Society2013

A deep-blue emitting charged bis-cyclometallated iridium(III) complex for light-emitting electrochemical cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

We report here a new cationic bis-cyclometallated iridium(III) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2',6'-difluoro-2,3'-bipyridine skeleton as the cyclometallat ...

Royal Society of Chemistry2013

Sterically demanded unsymmetrical zinc phthalocyanines for dye-sensitized solar cells

Mohammad Khaja Nazeeruddin, Aswani Yella, Peng Gao, Filippo de Angelis

Three new sterically demanding unsymmetrical zinc phthalocyanines have been designed and synthesized as sensitizers for dye-sensitized solar cells. All three unsymmetrical phthalocyanines have been completely characterized by elemental analyses, mass spect ...

Elsevier2013

Enhancing the open circuit voltage of dye sensitized solar cells by surface engineering of silica particles in a gel electrolyte

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Lioz Etgar, Guillaume Schuchardt

We prepared a quasi-solid electrolyte for dye-sensitized solar cells (DSSCs) that consist of ionic liquid and modified silica particles. Commercial bare silica F5 particles and modified silica F5 by NH2 and NH3+ groups were prepared, and fully characterize ...

Royal Society of Chemistry2013

Core/Shell PbSe/PbS QDs TiO2 Heterojunction Solar Cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar

Quasi type-II PbSe/PbS quantum dots (QDs) are employed in a solid state high efficiency QD/TiO2 heterojunction solar cell. The QDs are deposited using layer-by-layer deposition on a half-micrometer-thick anatase TiO2 nanosheet film with (001) exposed facet ...

Wiley-Blackwell2013

First Principles Design of Dye Molecules with Ullazine Donor for Dye Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Sheng Meng, Yunfei Jiao, Wanli Ma

We design a series of metal-free donor-pi-bridge molecules (denoted VB0-VB4) based on a new donor group-ullazine donor-as sensitizers for dye sensitized solar cell (DSSC) applications. Density functional theory (DFT) and time-dependent DFT calculations rev ...

American Chemical Society2013

Using a two-step deposition technique to prepare perovskite (CH3NH3PbI3) for thin film solar cells based on ZrO2 and TiO2 mesostructures

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt, Soo-Jin Moon, Lin Yang, Dongqin Bi

A two-step deposition technique is used for preparing CH3NH3PbI3 perovskite solar cells. Using ZrO2 and TiO2 as a mesoporous layer, we obtain an efficiency of 10.8% and 9.5%, respectively, under 1000 W m(-2) illumination. The ZrO2 based solar cell shows hi ...

RSC Publishing2013

Phosphorescence of iridium(III) complexes with 2-(2-pyridyl)-1,3,4-oxadiazoles

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

Cationic bis-cyclometalated iridium(III) complexes (C boolean AND N)(2)Ir(N boolean AND N) with 2-(2'-pyridyl)-5-R-1,3,4-oxadiazoles (N boolean AND N; R = 1-adamantyl, mesityl, N-diphenylamino) have a redox gap of 2.58-2.68 V and exhibit orange-red ...

Elsevier2013

Tuning the photophysical properties of cationic iridium(III) complexes containing cyclometallated 1-(2,4-difluorophenyl)-1H-pyrazole through functionalized 2,2 '-bipyridine ligands: blue but not blue enough

Mohammad Khaja Nazeeruddin

Four new heteroleptic iridium(III) complexes in the family Ir(dfppz)(2)((NN)-N-boolean AND), where Hdfppz = 1-(2,4-difluorophenyl)-1H-pyrazole and (NN)-N-boolean AND = 6-phenyl-2,2'-bipyridine (1), 4,4'-(di-tert-butyl)-6-phenyl-2,2'-bipyridine (2), 4, ...

Royal Society of Chemistry2013

Nanostructured TiO2/CH3NH3PbI3 heterojunction solar cells employing spiro-OMeTAD/Co-complex as hole-transporting material

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yong Chan Choi

For using 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) as a hole conductor in solar cells, it is necessary to improve its charge-transport properties through electrochemical doping. With the aim of fabricating effici ...

Royal Society of Chemistry2013

Temperature Dependence of Transport Properties of Spiro-MeOTAD as a Hole Transport Material in Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Amalie Dualeh

The internal transport and recombination parameters of solid-state dye-sensitized solar cells (ssDSCs) using the amorphous organic semiconductor 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobtfluorene (spiro-MeOTAD) as a hole transport materia ...

American Chemical Society2013

Efficient inorganic-organic hybrid heterojunction solar cells containing perovskite compound and polymeric hole conductors

Michael Graetzel, Mohammad Khaja Nazeeruddin, Arpita Sarkar, Yonghui Lee

Inorganic-organic hybrid structures have become innovative alternatives for next-generation dye-sensitized solar cells, because they combine the advantages of both systems. Here, we introduce a layered sandwich-type architecture, the core of which comprise ...

Nature Publishing Group2013

Extreme Tuning of Redox and Optical Properties of Cationic Cyclometalated Iridium(III) Isocyanide Complexes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

We report seven heteroleptic cationic iridium(III) complexes with cyclometalating N-arylazoles and alkyl/aryl isocyanides, ((CN)-N-boolean AND)(2)Ir(CNR)(2), and characterize two of them by crystal structure analysis. The complexes are air- and m ...

American Chemical Society2013

Thiocyanate-Free Ru(II) Sensitizers with a 4,4-Dicarboxyvinyl-2,2-bipyridine Anchor for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella, Kuan-Lin Wu, Shilong Wang

A new class of thiocyanate-free Ru(II) sensitizers with 4,4-dicarboxyvinyl-2,2-bipyridine anchor and two trans-oriented pyrid-2-yl pyrazolate (or triazolate) functional chromophores is synthesized, characterized, and evaluated in dye-sensitized solar cells ...

Wiley-Blackwell2013

Compounds for electrochemical and/or optoelectronic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin

The invention relates to substituted ullazine and analogs of ullazine as sensitizers for dye-sensitized solar cells (DSSCs) and other photoelectrochemical and/or optoelectronic devices. The sensitizers may comprise donor substituents and/oracceptor substit ...

2013

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