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Mohammad Khaja Nazeeruddin

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Publications associées (846)

Flexible high efficiency perovskite solar cells

Mohammad Khaja Nazeeruddin, Mohammad Ibrahim Dar, Cristina Roldán Carmona

Flexible perovskite based solar cells with power conversion efficiencies of 7% have been prepared on PET based conductive substrates. Extended bending of the devices does not deteriorate their performance demonstrating their suitability for roll to roll pr ...

Royal Society of Chemistry2014

Stable Quasi-Solid-State Dye-Sensitized Solar Cells Using Novel Low Molecular Mass Organogelators and Room-Temperature Molten Salts

Michael Graetzel, Mohammad Khaja Nazeeruddin, Chunyang Zhang, Yong Ding, Bing Zhang, Li Tao

Stable quasi-solid-state dye-sensitized solar cells (DSCs) were fabricated by using room-temperature molten salts (1-methyl-3-hexyl-imidazolium iodide), and a series of diamine derivatives with different lengths of alkyl chain as low molecular mass organog ...

American Chemical Society2014

Perovskite Solar Cells with 12.8% Efficiency by Using Conjugated Quinolizino Acridine Based Hole Transporting Material

Michael Graetzel, Mohammad Khaja Nazeeruddin, Norman Pellet, Peng Qin, Mohammad Ibrahim Dar, Sanghyun Paek

A low band gap quinolizino acridine based molecule was designed and synthesized as new hole transporting material for organic-inorganic hybrid lead halide perovskite solar cells. The functionalized quinolizino acridine compound showed an effective hole mob ...

American Chemical Society2014

Metal-Oxide-Free Methylammonium Lead Iodide Perovskite-Based Solar Cells: the Influence of Organic Charge Transport Layers

Mohammad Khaja Nazeeruddin, Cristina Roldán Carmona

Metal-oxide-free methylammonium lead iodide perovskite-based solar cells are prepared using a dual-source thermal evaporation method. This method leads to high quality reproducible films with large crystal domain sizes allowing for an in depth study of the ...

Wiley-V C H Verlag Gmbh2014

Molecular Engineering of 2-Quinolinone Based Anchoring Groups for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Peng Gao, Paramaguru Ganesan

Six new donor-pi spacer-acceptor (D-pi-A) organic sensitizers based on the 2-quinolinone moiety as acceptor and anchoring groups were synthesized and tested for their performance in dye-sensitized solar cells (DSSCs). The systematic tuning of acceptor stre ...

American Chemical Society2014

Real-space observation of unbalanced charge distribution inside a perovskite-sensitized solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Dan Li

Perovskite-sensitized solar cells have reached power conversion efficiencies comparable to commercially available solar cells used for example in solar farms. In contrast to silicon solar cells, perovskite-sensitized solar cells can be made by solution pro ...

Nature Publishing Group2014

Impedance Spectroscopic Analysis of Lead Iodide Perovskite-Sensitized Solid-State Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Joël Teuscher, Nicolas Tétreault, Thomas Moehl, Amalie Dualeh, Peng Gao

Mesoscopic solid-state solar cells based on the inorganic-organic hybrid perovskite CH(3)NH(3)Pbl(3) in conjunction with the amorphous organic semiconductor spiro-MeOTAD as a hole transport material (HIM) are investigated using impedance spectroscopy (IS). ...

American Chemical Society2014

The reorganization energy of intermolecular hole hopping between dyes anchored to surfaces

Mohammad Khaja Nazeeruddin, Davide Moia

We measured the rate of hole hopping between dye molecules on titanium dioxide nanocrystals using cyclic voltammetry. Dyes commonly used in the field of dye sensitized solar cells exhibited efficient intermolecular charge transport, showing apparent diffus ...

Royal Soc Chemistry2014

Analysis of Electron Transfer Properties of ZnO and TiO2 Photoanodes for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Mojtaba Abdi Jalebi

Mesoporous TiO2 nanoparticle films are used as photoanodes for high efficiency dye-sensitized solar cells (DSC). In spite of excellent photovoltaic power conversion efficiencies (PCE) displayed by titanium dioxide nanoparticle structures, the transport rat ...

American Chemical Society2014

Meso-Substituted Porphyrins for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin

Among the several approaches for harnessing solar energy and converting it into electricity, dye-sensitized solar cells (DSSC) represent one of the most promising methods for future large-scale power production from renewable energy sources. In these cells ...

Amer Chemical Soc2014

Star-shaped hole transporting materials with a triazine unit for efficient perovskite solar cells

Mohammad Khaja Nazeeruddin

Novel star-shaped hole transporting materials with a triazine unit have been synthesized. When the new Triazine-Th-OMeTPA was used as a hole transporting material in perovskite solar cells, the power conversion efficiency reached 12.51% under AM 1.5 G (100 ...

Royal Society of Chemistry2014

Highly efficient flexible cathodes for dye sensitized solar cells to complement Pt@TCO coatings

Mohammad Khaja Nazeeruddin, Francisco Javier Ramos Mellado

Solution-processed, semi-transparent, conductive electrodes based on PEDOT: PSS [poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)] using silver grids were developed on a plastic support. The flexible electrode (flextrode) was employed as a cathode i ...

Royal Society of Chemistry2014

Panchromatic symmetrical squaraines: a step forward in the molecular engineering of low cost blue-greenish sensitizers for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo, Jun Ho Yum, Elisa Dell'Orto

Two novel symmetrical blue squaraine sensitizers were synthesized, which exhibit panchromatic light harvesting and a record efficiency over 6% with J(sc) exceeding 14 mA cm(-2), and V-oc over 620 mV under 1 sun. Their color, low cost, easiness of synthesis ...

Royal Soc Chemistry2014

Engineering of Ru(II) dyes for interfacial and light-harvesting optimization

Michael Graetzel, Mohammad Khaja Nazeeruddin, Kuan-Lin Wu, Gabriele Marotta, Filippo de Angelis

A new Ru(II) dye, Ru(L1)(L2) (NCS)(2), L1 = (4-(5-hexylthiophen-2-yl)-4'(4-carboxyl-phenyl 2,2'-bipyridine) and L2 = (4-4'-dicarboxy-2,2'- bipyridine), labelled MC112, based on a dissymmetric bipyridine ligand for improved interfacial and optical propertie ...

Royal Society of Chemistry2014

Organo metal halide perovskite heterojunction solar cell and fabrication thereof

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar

The present invention provides a solid state heterojunction solar cell comprising a transparent conducting support layer (2,3), on which a nanostructured, surface-increasing scaffold structure is provided, wherein an organic-inorganic perovskite layer (4) ...

2014

Gel electrolyte materials formed from a series of novel low molecular mass organogelators for stable quasi-solid-state dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Xu Pan, Chunyang Zhang, Yong Ding, Lu Wang, Li Tao

Electrolyte materials are the key components in dye-sensitized solar cells (DSCs) and are very crucial to the performance and long-term stability of DSCs. We developed a series of diamide derivatives as novel low molecular mass organogelators (LMOGs) for D ...

Royal Society of Chemistry2014

Cation-Induced Band-Gap Tuning in Organohalide Perovskites: Interplay of Spin-Orbit Coupling and Octahedra Tilting

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paolo Umari, Filippo de Angelis

Organohalide lead perovskites have revolutionized the scenario of emerging photovoltaic technologies. The prototype MAPbI(3) perovskite (MA = CH3NH3+) has dominated the field, despite only harvesting photons above 750 nm (similar to 1.6 eV). Intensive rese ...

American Chemical Society2014

Dithieno[2,3-d;2 ',3 '-d ']benzo[1,2-b;4,5-b ']-dithiophene based organic sensitizers for dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Hoi Nok Tsao, Peng Gao, Xin Guo

We report two novel D-pi-A type organic dyes with a coplanar dithieno[2,3-d; 2',3'-d']benzo[1,2 b;4,5-b']dithiophene (DTBDT) as pi-spacer for dye-sensitized solar cells. A best device performance with a power conversion efficiency of 6.32% is achieved, mak ...

RSC Publishing2014

Perovskite as Light Harvester: A Game Changer in Photovoltaics

Michael Graetzel, Mohammad Khaja Nazeeruddin

It is not often that the scientific community is blessed with a material, which brings enormous hopes and receives special attention. When it does, it expands at a rapid pace and its every dimension creates curiosity. One such material is perovskite, which ...

Wiley-Blackwell2014

The Role of Insulating Oxides in Blocking the Charge Carrier Recombination in Dye- Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran

Electron recombination is one of the major loss factors in dye-sensitized solar cells (DSC), especially, with single electron outer sphere redox shuttle electrolyte. Insulating sub-nanometer oxide tunneling layers deposited by atomic layer deposition (ALD) ...

Wiley-Blackwell2014

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