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Michael Graetzel

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Related publications (1,223)

Editorial - Solar Energy Harvesting

Michael Graetzel, Anne-Sophie Chauvin

Schweizerische Chemische Gesellschaft2013

Synthesis and crystal chemistry of the hybrid perovskite (CH3NH3) PbI3 for solid-state sensitised solar cell applications

Michael Graetzel, Jeannette Medina Kadro

The hybrid organic-inorganic perovskite (CH3NH3) PbI3 may find application in next generation solid-state sensitised solar cells. Although this material and related perovskites were discovered many decades ago, questions remain concerning their diverse str ...

Royal Society of Chemistry2013

Metal free sensitizer and catalyst for dye sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ladislav Kavan

The carbon neutral process for energy conversion is of utmost importance, in this context photovoltaics, especially dye sensitized solar cells (DSSCs) are a viable alternative. Few terawatts of carbon free renewable energy can be produced by DSSCs. However ...

Royal Society of Chemistry2013

Position-Dependent Extension of π-Conjugation in D-π-A Dye Sensitizers and the Impact on the Charge-Transfer Properties

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Thomas Wesley Holcombe, Mateusz Barnaba Wielopolski, Yuxiang Yu, Jinhyun Kim

A series of five organic donor-π-bridge-acceptor (D-π-A) sensitizers is investigated within the context of their photoinduced charge-transfer properties. Thereby, the focus is set on the impact of structural modifications of the molecular architecture on t ...

American Chemical Society2013

Efficient Inorganic Organic Hybrid Perovskite Solar Cells Based on Pyrene Arylamine Derivatives as Hole-Transporting Materials

Michael Graetzel, Mohammad Khaja Nazeeruddin

A set of three N,N-di-p-methoxyphenylamine-substituted pyrene derivatives have successfully been synthesized and characterized by H-1/C-13 NMR spectroscopy, mass spectrometry, and elemental analysis. The optical and electronic structures of the pyrene deri ...

American Chemical Society2013

Blue-Coloured Highly Efficient Dye-Sensitized Solar Cells by Implementing the Diketopyrrolopyrrole Chromophore

Michael Graetzel, Mohammad Khaja Nazeeruddin, Joël Teuscher, Jun Ho Yum, Thomas Moehl, Thomas Wesley Holcombe, Kasparas Rakstys, Yongjoo Kim

The paradigm shift in dye sensitized solar cells (DSCs) - towards donor-pi bridge-acceptor (D-pi-A) dyes - increases the performances of DSCs and challenges established design principles. Framed by this shifting landscape, a series of four diketopyrrolopyr ...

Nature Publishing Group2013

How to blue-shift phosphorescence color of iridium(III) complexes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

We achieve a 20-58 nm (610-1890 cm (1)) blue-shift of the phosphorescence maximum of iridium(III) complexes (CN)(2)Ir(NN) of 1,10-phenanthrolines (NN) by modifying the cyclometalating 2-phenylpyridine ligand (CN = ppy) with an electron-w ...

2013

Highly soluble energy relay dyes for dye-sensitized solar cells

Michael Graetzel, Jun Ho Yum

High solubility is a requirement for energy relay dyes (ERDs) to absorb a large portion of incident light and significantly improve the efficiency of dye-sensitized solar cells (DSSCs). Two benzonitrile-soluble ERDs, BL302 and BL315, were synthesized, char ...

Royal Society of Chemistry2013

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

Organic Sensitizers with Bridged Triphenylamine Donor Units for Efficient Dye-Sensitized Solar Cells

Michael Graetzel, Hoi Nok Tsao, Wei Zhang

Bridged triphenylamine was chosen as the donor unit for metal-free organic sensitizers in dye-sensitized solar cells (DSSCs). The easily constructed alkene linkage between the donor and the spacer improves the molecule's delocalization and causes a large r ...

Wiley-VCH Verlag Berlin2013

Structural variations of D-pi-A dyes influence on the photovoltaic performance of dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Robin Humphry-Baker, Magdalena Anna Marszalek

Two new organic D-pi-A dyes containing identical pi-conjugated spacer and anchoring/acceptor moieties but different donor groups were designed and synthesized. These dyes containing didodecylcyclopentadithiophene (CPDT) as a spacer, cyanoacrylic acid as an ...

RSC Publishing2013

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

Revealing and Accelerating Slow Electron Transport in Amorphous Molybdenum Sulphide Particles for Hydrogen Evolution Reaction

Michael Graetzel, Xile Hu, Heron Vrubel, Thomas Moehl

Electrochemical impedance spectroscopy is used to identify a slow electron transport process in hydrogen evolution catalysed by amorphous molybdenum sulphides on glassy carbon. A new chemical synthesis leads to an amorphous molybdenum sulfide catalyst with ...

Royal Society of Chemistry2013

A dip coating process for large area silicon-doped high performance hematite photoanodes

Michael Graetzel, Yelin Hu, Artur Braun, Florent Alexandre Boudoire

A facile and low-cost dip-coating process for the deposition of silicon doped hematite films (Si:alpha-Fe2O3) for hydrogen production by solar water splitting in photo-electrochemical cells (PEC) is presented. The precursors include iron nitrate, oleic aci ...

Amer Inst Physics2013

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

Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH3NH3PbI3

Michael Graetzel, Nripan Mathews

Low-temperature solution-processed photovoltaics suffer from low efficiencies because of poor exciton or electron-hole diffusion lengths (typically about 10 nanometers). Recent reports of highly efficient CH3NH3PbI3-based solar cells in a broad range of co ...

American Association for the Advancement of Science2013

Nanostructured Photosystems for the Generation of Electricity and Fuels from Sunlight

Michael Graetzel

Learning from the concepts used by green plants photosynthesis, we have developed nanostructured systems affording efficient solar light harvesting and conversion to electricity and fuels. Solar cells using dyes or semiconducting nanoparticles as light har ...

Amer Inst Physics2013

Reversible chemical delithiation/lithiation of LiFePO4: towards a redox flow lithium-ion battery

Michael Graetzel

Reversible chemical delithiation/lithiation of LiFePO4 was successfully demonstrated using ferrocene derivatives, based on which a novel energy storage system - the redox flow lithium-ion battery (RFLB), was devised by integrating the operation flexibility ...

Royal Society of Chemistry2013

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

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