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Mohammad Khaja Nazeeruddin

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Related publications (846)

Functionalized alkyne bridged dendron based chromophores for dye-sensitized solar cell applications

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

We report the results of an investigation on the preparation, spectral and photoelectrochemical properties of alkyne bridged dendron chromophores with carboxylic acid anchoring group, which adhere effectively to nanocrystalline (anatase) TiO2 surfaces yiel ...

2009

Molecular Design of Unsymmetrical Squaraine Dyes for High Efficiency Conversion of Low Energy Photons into Electrons Using TiO2 Nanocrystalline Films

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Geiger, Jun Ho Yum, Soo-Jin Moon

An optimized unsymmetrical squaraine dye 5-carboxy-2[[3-[(2,3-dihydro-1, 1-dimethyl-3-ethyl-1H-benzo[e]indol-2-ylidene)methyl]-2-hydroxy-4-oxo-2-cyclobuten-1-ylidene]methyl]-3,3-dimethyl-1-octyl-3H-indolium (SQ02) with carboxylic acid as anchoring group is ...

2009

Panchromatic Response in Solid-State Dye-Sensitized Solar Cells Containing Phosphorescent Energy Relay Dyes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Soo-Jin Moon

Running relay: Incorporating an energy-relay dye (ERD) into the hole transporter of a dye-sensitized solar cell increased power-conversion efficiency by 29 % by extending light harvesting into the blue region. In the operating mechanism (see picture), abso ...

Wiley-VCH Verlag GmbH2009

Panchromatic Cross-Substituted Squaraines for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Filippo de Angelis

2009

An Efficient Dye-Sensitized Solar Cell with an Organic Sensitizer Encapsulated in a Cyclodextrin Cavity

Michael Graetzel, Mohammad Khaja Nazeeruddin

Wiley-VCH Verlag GmbH2009

Regenerative PbS and CdS Quantum Dot Sensitized Solar Cells with a Cobalt Complex as Hole Mediator

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Peter Chen, Takeru Bessho, Soo-Jin Moon, Kevin Sivula

Metal sulfide (PbS and CdS) quantum dots (QDs) were prepared over mesoporous TiO2 films by improved successive ionic layer adsorption and reaction (SILAR) processes. The as-prepared QD-sensitized electrodes were combined with a cobalt complex redox couple ...

2009

High Open-Circuit Voltage Solid-State Dye-Sensitized Solar Cells with Organic Dye

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Peter Chen, Jun Ho Yum, Soo-Jin Moon, Filippo de Angelis

Solid-state dye-sensitized solar cells were fabricated using an organic dye, 2-cyanoacrylic acid-4-(bis-dimethylfluoreneaniline)dithiophene (JK2), which exhibits more than 1 V open-circuit potential (V-oc). To scrutinize the origin of high voltage in these ...

American Chemical Society (ACS)2009

Organic dyes with a novel anchoring group for dye-sensitized solar cell applications

Michael Graetzel, Mohammad Khaja Nazeeruddin

Two novel trialkylsilyl-containing organic sensitizers (JK-53 and JK-54) have been designed and synthesized. Nanocrystalline TiO2-silica-based dye-sensitized solar cells (DSSCs) were fabricated using these dyes. Under standard global AM 1.5 solar condition ...

Elsevier2009

Influence of Sodium Cations of N3 Dye on the Photovoltaic Performance and Stability of Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin

We report on the effect of substituting the two tetrabutyl ammonium counter ions of the standard N719 dye by sodium ions on the performance and stability of dye-sensitized solar cells (DSCs). The disodium analogue of N719 in conjunction with a non-volatile ...

2009

Unsymmetrical extended pi-conjugated zinc phthalocyanine for sensitization of nanocrystalline TiO2 films

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

We have designed and synthesized a new unsymmetrical zinc phthalocyanine based on 'push-pull' and extended pi-conjugation concept, PCH008. The new sensitizer was fully characterized by CHN anlysis, UV-Vis., fluorescence spectroscopies and cyclic voltammetr ...

2009

Time-dependent density functional theory study of squaraine dye-sensitized solar cells

Mohammad Khaja Nazeeruddin, Filippo de Angelis

We employ time-dependent density functional theory to study the optical properties of a squaraine sensitized TiO2 system, as a model for the corresponding dye-sensitized solar cell. The all-organic squaraine dye is particularly promising for light absorpti ...

Elsevier2009

Increased light harvesting in dye-sensitized solar cells with energy relay dyes

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

Conventional dye-sensitized solar cells have excellent charge collection efficiencies, high open-circuit voltages and good fill factors. However, dye-sensitized solar cells do not completely absorb all of the photons from the visible and near-infrared doma ...

Nature Publishing Group2009

Substituent Effect on the Meso-Substituted Porphyrins: Theoretical Screening of Sensitizer Candidates for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Xiaoyu Zhang

According to the concepts of attribute axis and attribute coordinate system, porphine and 11 kinds of bridge carbon substituted porphyrins as donors and 9 common acceptors A-I have been designed and calculated at the density functional B3LYP level. The sub ...

2009

Di-branched di-anchoring organic dyes for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Xiaoyu Zhang, Filippo de Angelis

The first examples of di-branched di-anchoring organic sensitizers were synthesized and used in dye-sensitized solar cells leading to red-shifted IPCE maxima and increased photocurrent when compared to the corresponding mono-branched mono-anchoring dye, yi ...

2009

Highly Efficient Organic Sensitizers for Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Ulf Anders Hagfeldt, Jun Ho Yum, Soo-Jin Moon

Organic sensitizers comprising of donor, electron-conducting, and anchoring groups are designed and developed for dye-sensitized solar cell applications. A solar cell employing 3-(5'-{4-[bis-(4-hexyloxy-phenyl)-amino]-phenyl}-[2,2']bithiophenyl-5-yl)-2-cya ...

2009

Facile preparation of large aspect ratio ellipsoidal anatase TiO2 nanoparticles and their application to dye-sensitized solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

A simple one-step heat-treatment of peroxotitanate complex aqueous solution at around 100 degrees C was resulted in the formation of ellipsoidal anatase TiO2 nanoparticles having a high aspect ratio with no branches. The length of these ellipsoidal TiO2 fa ...

Elsevier2009

Carboxy-1,4-phenylenevinylene- and carboxy-2,6-naphthylene-vinylene unsymmetrical substituted zinc phthalocyanines for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

Two unsymmetrical Zn(II) phthalocyanines 1 and 2 bearing an anchoring carboxylic function linked to the phthalocyanine ring through different rigid arylenevinylene bridges have been designed for dye-sensitized solar cell (DSSC) applications. The phthalocya ...

2009

Study of Dye-Sensitized Solar Cells by Scanning Electron Micrograph Observation and Thickness Optimization of Porous TiO2 Electrodes

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Péter Kalman Péchy

2009

A Light-Resistant Organic Sensitizer for Solar-Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt, Jun Ho Yum, Soo-Jin Moon

Finely tuned: A stable dye-sensitized solar cell that contains a molecularly engineered org. dye was prepd. The efficiency of the cell remains at 90% after 1000 h of light soaking at 60°. The remarkable stability of the cell is also reflected in the open-c ...

Wiley-VCH Verlag GmbH2009

An ester-substituted iridium complex for efficient vacuum-processed organic light-emitting diodes

Philippe Bugnon, Michael Graetzel, Mohammad Khaja Nazeeruddin, Libero Zuppiroli, Rosario Scopelliti, Stéphane Suarez

An orange-red-emitting iridium complex (N958) was prepared, and its photophysical and device-based characteristics were investigated. Despite N958 displaying quite poor photophysical properties in solution (acetonitrile), organic light-emitting diode (OLED ...

2009

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