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Michael Graetzel

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Related publications (1,223)

Kinetics of the Regeneration by Iodide of Dye Sensitizers Adsorbed on Mesoporous Titania

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Joël Teuscher, Julien Alexandre Andres, Arianna Marchioro, Peng Wang

Regeneration of dye sensitizer molecules by reducing species contained in the electrolyte is a key mechanism in liquid dye-sensitized solar cells because it competes kinetically with a detrimental charge recombination process. Kinetics of the reduction by ...

Amer Chemical Soc2014

A quasi core-shell nitrogen-doped graphene/cobalt sulfide conductive catalyst for highly efficient dye-sensitized solar cells

Michael Graetzel

A novel conductive catalyst was designed based on a quasi core shell structure of N-doped graphene/cobalt sulfide. This platinum-free catalyst shows high catalytic activity and conductivity owing to close interactions between the core (cobalt sulphide) and ...

Royal Society of Chemistry2014

Investigation Regarding the Role of Chloride in Organic-Inorganic Halide Perovskites Obtained from Chloride Containing Precursors

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Mohammad Ibrahim Dar, Neha Arora

As the photovoltaic performance of a device is strongly influenced by the morphology of perovskite, achieving precise control over the crystal formation of organic-inorganic halide perovskites synthesized in the ambience of chloride ions has garnered much ...

American Chemical Society2014

Mixed-Organic-Cation Perovskite Photovoltaics for Enhanced Solar-Light Harvesting

Michael Graetzel, Mohammad Khaja Nazeeruddin, Norman Pellet, Peng Gao, Joachim Maier

Hybrid organic-inorganic lead halide perovskite APbX(3) pigments, such as methylammonium lead iodide, have recently emerged as excellent light harvesters in solid-state mesoscopic solar cells. An important target for the further improvement of the performa ...

Wiley-Blackwell2014

A quinoxaline-fused tetrathiafulvalene-based sensitizer for efficient dye-sensitized solar cells

Michael Graetzel, Michele Cascella, Chenyi Yi, Jiabao Yang, Martin Peter Bircher

A new quinoxaline-fused tetrathiafulvalene-based sensitizer has been prepared and characterized. The resulting power conversion efficiency of 6.47% represents the best performance to date for tetrathiafulvalene-sensitized solar cells. ...

Royal Society of Chemistry2014

Organohalide lead perovskites for photovoltaic applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao

There are only few semiconducting materials that have been shaping the progress of third generation photovoltaic cells as much as perovskites. Although they are deceivingly simple in structure, the archetypal AMX(3)-type perovskites have built-in potential ...

Royal Society of Chemistry2014

Thermal Behavior of Methylammonium Lead-Trihalide Perovskite Photovoltaic Light Harvesters

Michael Graetzel, Mohammad Khaja Nazeeruddin, Amalie Dualeh, Peng Gao

Recently organicinorganic hybrid perovskites have attracted attention as light harvesting materials in mesoscopic cells. While a considerable number of deposition and formation methods have been reported for the perovskite crystalline material, most involv ...

Amer Chemical Soc2014

A swivel-cruciform thiophene based hole-transporting material for efficient perovskite solar cells

Michael Graetzel, Satvasheel Powar, Nripan Mathews, Kunwu Fu

A novel swivel- cruciform 3,3'- bithiophene based hole- transporting material (HTM) with a low lying highest occupied molecular orbital (HOMO) level was synthesized. This new HTM (KTM3) in CH3NH3PbI3 perovskite solar cells showed a higher V-oc (1.08 V) and ...

Royal Society of Chemistry2014

From marine plants to photovoltaic devices

Michael Graetzel, Liang Wang, Hong Zhang, Ning Wang

We demonstrated that extracts from sea tangle can serve as a sensitizer, redox couple, as well as a counter electrode material, or even can be fabricated into an "all-natural solar cell". Especially, the carbon counter electrode from sea tangle has achieve ...

Royal Society of Chemistry2014

High efficiency Porphyrin Sensitized Mesoscopic Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Joël Teuscher, Chenyi Yi, Fabrizio Giordano

Dye-Sensitized Solar Cells (DSSC) represents a reliable technology, ready for the market and able to compete with silicon solar cells for specific fields of application. Porphyrin dyes allow reaching high power conversion efficiency in conjunction with cob ...

Spie-Int Soc Optical Engineering2014

Redox couple for electrochemical and optoelectronic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Jun Ho Yum, Aswani Yella, Hoi Nok Tsao

The present invention provides an improved redox couple for electrochemical and optoelectronic devices. The redox couple is based on a complex of a first row transition metal, said complex containing at least one mono-, bi-, or tridentate ligand comprising ...

2014

Growth of CH3NH3PbI3 cuboids with controlled size for high-efficiency perovskite solar cells

Michael Graetzel, Norman Pellet, Jeong-Hyeok Im

Perovskite solar cells with submicrometre-thick CH3NH3PbI3 or CH3NH3PbI3-xClx active layers show a power conversion efficiency as high as 15%. However, compared to the best-performing device, the average efficiency was as low as 12%, with a large standard ...

Nature Publishing Group2014

Optically Transparent FTO-Free Cathode for Dye-Sensitized Solar Cells

Michael Graetzel, Paul Liska, Shaik Mohammed Zakeeruddin, Ladislav Kavan

The woven fabric containing electrochemically platinized tungsten wire is an affordable flexible cathode for liquid-junction dye-sensitized solar cells with the I-3(-)/I- redox mediator and electrolyte solution consisting of ionic liquids and propionitrile ...

Amer Chemical Soc2014

Near-IR Photoresponse of Ruthenium Dipyrrinate Terpyridine Sensitizers in the Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella

Coordination of bidentate 5-pentafluorophenyldipyrrinate (pfpdp) or 5-(2-thienyl)dipyrrinate (2-tdp) to a Ru-II center bearing 2,2':6',2 ''-terpyridine-4,4',4 ''-tricarboxylate (tctpy) and a NCS- ligand results in strongly light-absorbing complexes [Ru(tct ...

American Chemical Society2014

Organometal Halide Perovskite Photovoltaics: A Diamond In The Rough

Michael Graetzel

The sun finds a diamond in the rough, which is the organo-metal halide perovskite. Thanks to exceptional optoelectronic characteristics, solar cells employing perovskite demonstrated first a power conversion efficiency ( PCE) of 9.7% in the middle of 2012, ...

World Scientific Publ Co Pte Ltd2014

Yttrium-substituted nanocrystalline TiO2 photoanodes for perovskite based heterojunction solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Aravind Kumar Chandiran, Thomas Moehl, Peng Gao, Peng Qin, Mohammad Ibrahim Dar

We report the use of Y3+-substituted TiO2 (0.5% Y-TiO2) in solid-state mesoscopic solar cells, consisting of CH3NH3PbI3 as the light harvester and spiro-OMeTAD as the hole transport material. A power conversion efficiency of 11.2% under simulated AM 1.5 fu ...

Royal Society of Chemistry2014

Ultrafast Charge Carrier Recombination and Trapping in Hematite Photoanodes under Applied Bias

Michael Graetzel, Maurin Cornuz, Florian Le Formal, Stanley David Tilley, Xiaoyan Wang

Transient absorption spectroscopy on subpicosecond to second time scales is used to investigate photogenerated charge carrier recombination in Si-doped nanostructured hematite (alpha-Fe2O3) photoanodes as a function of applied bias. For unbiased hematite, ...

American Chemical Society2014

Melt-infiltration of spiro-OMeTAD and thermal instability of solid-state dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin

A method for achieving complete pore-filling in solid-state dye-sensitized solar cells termed meltinfiltration is presented: after the customary solution-processed deposition of spiro-OMeTAD, the device is heated above the glass transition temperature of s ...

Royal Society of Chemistry2014

Subphthalocyanines: Active molecules for molecular photovoltaics

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Aswani Yella, Olga Trukhina

Amer Chemical Soc2014

On the Solar to Hydrogen Conversion Efficiency of Photoelectrodes for Water Splitting

Michael Graetzel, Takashi Hisatomi, Nripan Mathews

Amer Chemical Soc2014

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