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Mohammad Khaja Nazeeruddin

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Related publications (846)

Electronic and Optical Properties of the Spiro-MeOTAD Hole Conductor in Its Neutral and Oxidized Forms: A DFT/TDDFT Investigation

Michael Graetzel, Mohammad Khaja Nazeeruddin, Filippo de Angelis

The molecular structures and electronic and optical properties of 2,2'7,7'-tetrakis-(N,N-di-p-methoxyphenyl amine)-9,9'-spirobifluorene (spiro-MeOTAD) in different oxidation states have been investigated by means of DFT/TDDFT methods. Spiro-MeOTAD has been ...

American Chemical Society2011

Effect of Sensitizer Adsorption Temperature on the Performance of Dye-Sensitized Solar Cells

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Peng Wang

Employing a mesoscopic titania photoanode whose bilayer structure was judiciously selected to fit the optoelectronic characteristics of the Ru-based heteroleptic complex Na-cis-Ru(4,4'-(5-hexyltiophen-2-yl)-2,2'-bipyridine)(4-carboxylic-acid-4'-carboxylate ...

2011

Absorption Spectra and Excited State Energy Levels of the N719 Dye on TiO2 in Dye-Sensitized Solar Cell Models

Michael Graetzel, Mohammad Khaja Nazeeruddin, Filippo de Angelis

We have investigated the absorption spectrum and the alignment of ground and excited state energies for the prototypical N719 Ru(II) sensitizer adsorbed on an extended TiO2 model by means of high level DFT/TDDFT calculations. The calculated and experimenta ...

American Chemical Society2011

Efficient and stable panchromatic squaraine dyes for dye-sensitized solar cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek

A new series of stable, unsymmetrical squaraine near-IR sensitizers (JK-216 and JK-217), which are assembled using both thiophenyl pyrrolyl and indolium groups, exhibit a panchromatic light harvesting up to 780 nm. The JK-216 based cell exhibited a record ...

Royal Society of Chemistry2011

Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Aravind Kumar Chandiran, Aswani Yella, Chenyi Yi, Hoi Nok Tsao

The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized ...

American Association for the Advancement of Science2011

Cyclopentadithiophene Bridged Donor-Acceptor Dyes Achieve High Power Conversion Efficiencies in Dye-Sensitized Solar Cells Based on the tris-Cobalt Bipyridine Redox Couple

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Jun Ho Yum, Thomas Moehl, Chenyi Yi, Hoi Nok Tsao

2011

Panchromatic response composed of hybrid visible-light absorbing polymers and near-IR absorbing dyes for nanocrystalline TiO2-based solid-state solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin

In pursuit of panchromatic sensitizers for mesoporous TiO2-based solid-state solar cells, a near-IR absorbing zinc phthalocyanine dye (coded TT1) was firstly adsorbed over relatively thin (similar to 1 mu m) TiO2 mesoporous films and then a visible-light a ...

Elsevier2011

Design of Dye Acceptors for Photovoltaics from First-Principles Calculations

Michael Graetzel, Mohammad Khaja Nazeeruddin, Efthimios Kaxiras, Sheng Meng

We investigate a set of donor-pi-acceptor (D-pi-A) dyes with new acceptor groups for dye-sensitized solar cells, using time-dependent density-functional-theory calculations of the electronic structure and optical absorption. We considered three types of mo ...

American Chemical Society2011

Design and Development of Functionalized Cyclometalated Ruthenium Chromophores for Light-Harvesting Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Baumgartner, Aswani Yella

The syntheses and the electrochemical spectroscopic properties of a suite of asymmetrical bistridentate cyclometalated Ru(II) complexes bearing terminal triphenylamine (TPA) substituents are reported. These complexes, which contain structural design elemen ...

2011

Dye-sensitized solar cells: A brief overview

Michael Graetzel, Mohammad Khaja Nazeeruddin

The aim of this brief review is to give a short and simple overview of the dye-sensitized solar cell technology from the working principles to the first commercial applications. It emphasizes the role of the sensitizer and the strategies to improve the per ...

2011

Effect of heat and light on the performance of dye-sensitized solar cells based on organic sensitizers and nanostructured TiO2

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

The dye-sensitized solar cells based on the functionalized organic sensitizer, 3-(5-(5-(4-(bis(4-(hexyloxy)-phenyl)amino)phenyl)thiophen-2-yl)thiophen-2-yl)-2-cyanoacrylic acid (D21L6) exhibit comparable stability to the ruthenium sensitizers under 60 degr ...

Elsevier2010

An inconvenient influence of iridium(III) isomer on OLED efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Davide Di Censo, Filippo de Angelis

The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)(2)(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, D ...

Royal Society of Chemistry2010

Efficient Platinum-Free Counter Electrodes for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

Nanoporous layers of poly(3,4-propylenedioxythiophene) (PProDOT) were fabricated by electrical-field-assisted growth using hydrophobic ionic liquids as the growing medium. A series of PProDoT layers was prepared with three different ionic liquids to contro ...

2010

Theoretical Screening of -NH2-, -OH-, -CH3-, -F-, and -SH-Substituted Porphyrins As Sensitizer Candidates for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Xiaoyu Zhang

Following former Studies, the donor-acceptor combinations of -NH2-substituted porphyrin donor and the acceptors C, D, E, F, H and G, those of -OH-, -CH3- and -Ph-substituted porphyrins as well as porphine donors and the acceptors E, G. and H, and those of ...

American Chemical Society2010

Depleted-Heterojunction Colloidal Quantum Dot Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ines Raabe, Xiaoyan Wang

Colloidal quantum dot (CQD) photovoltaics combine low-cost solution processability with quantum size-effect tunability to match absorption with the solar spectrum. Rapid recent advances in CQD photovoltaics have led to impressive 3.6% AM1.5 solar power con ...

American Chemical Society2010

First-Principles Modeling of the Adsorption Geometry and Electronic Structure of Ru(II) Dyes on Extended TiO2 Substrates for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Filippo de Angelis

We report a systematic density functional theory (DFT) computational investigation of Ru(II) sensitizer/TiO2 systems relevant to dye-sensitized solar cells (DSSCs). Focusing on the prototypical N719 and the recently introduced YE05 sensitizers, and conside ...

American Chemical Society2010

Unsymmetrical squaraine dimer with an extended pi-electron framework: An approach in harvesting near infra-red photons for energy conversion

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Geiger

A fully conjugated unsymmetrical dimeric squaraine dye was synthesized. The synthetic key step for this dye, a selective Knoevenagel type condensation of end groups to the core moiety, allows the incorporation of a carboxylic acid function essentially for ...

Elsevier2010

Phosphorescent energy relay dye for improved light harvesting response in liquid dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum

Energy transfer from phosphorescent ruthenium complex N877 dissolved in the liquid electrolyte to the squaraine sensitizer SQ1 anchored on the titanium oxide surface resulted in a four fold increase in external quantum efficiency in the blue part of the vi ...

Royal Society of Chemistry2010

CdSe quantum dot (QD) and molecular dye hybrid sensitizers for TiO2 mesoporous solar cells: working together with a common hole carrier of cobalt complexes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin

Redox couples based on cobalt complexes were found to be effective in regenerating both inorganic CdSe quantum dot-and organic dye-sensitizers. The hybrid sensitizer composed of CdSe QD and ruthenium sensitizer (Z907Na) dye showed a maximum power conversio ...

Royal Society of Chemistry2010

Novel luminescent Ir(III) dyes for developing highly sensitive oxygen sensing films

Michael Graetzel, Mohammad Khaja Nazeeruddin

New sensing films have been developed for the detection of molecular oxygen. These films are based on luminescent Ir(III) dyes incorporated either into polystyrene (with and without plasticizer) or metal oxide, nanostructured material. The preparation and ...

Elsevier2010

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