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Michael Graetzel

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Related publications (1,223)

Nanostructured TiO2/CH3NH3PbI3 heterojunction solar cells employing spiro-OMeTAD/Co-complex as hole-transporting material

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yong Chan Choi

For using 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) as a hole conductor in solar cells, it is necessary to improve its charge-transport properties through electrochemical doping. With the aim of fabricating effici ...

Royal Society of Chemistry2013

Temperature Dependence of Transport Properties of Spiro-MeOTAD as a Hole Transport Material in Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Amalie Dualeh

The internal transport and recombination parameters of solid-state dye-sensitized solar cells (ssDSCs) using the amorphous organic semiconductor 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobtfluorene (spiro-MeOTAD) as a hole transport materia ...

American Chemical Society2013

Efficient inorganic-organic hybrid heterojunction solar cells containing perovskite compound and polymeric hole conductors

Michael Graetzel, Mohammad Khaja Nazeeruddin, Arpita Sarkar, Yonghui Lee

Inorganic-organic hybrid structures have become innovative alternatives for next-generation dye-sensitized solar cells, because they combine the advantages of both systems. Here, we introduce a layered sandwich-type architecture, the core of which comprise ...

Nature Publishing Group2013

Nanoclay Gelation Approach toward Improved Dye-Sensitized Solar Cell Efficiencies: An Investigation of Charge Transport and Shift in the TiO2 Conduction Band

Michael Graetzel, Kazuteru Nonomura, Xiaoyan Wang

Nanoclay minerals play a promising role as additives in the liquid electrolyte to form a gel electrolyte for quasi-solid-state dye-sensitized solar cells, because of the high chemical stability, unique swelling capability, ion exchange capacity, and theolo ...

Amer Chemical Soc2013

Extreme Tuning of Redox and Optical Properties of Cationic Cyclometalated Iridium(III) Isocyanide Complexes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

We report seven heteroleptic cationic iridium(III) complexes with cyclometalating N-arylazoles and alkyl/aryl isocyanides, ((CN)-N-boolean AND)(2)Ir(CNR)(2), and characterize two of them by crystal structure analysis. The complexes are air- and m ...

American Chemical Society2013

Thiocyanate-Free Ru(II) Sensitizers with a 4,4-Dicarboxyvinyl-2,2-bipyridine Anchor for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella, Kuan-Lin Wu, Shilong Wang

A new class of thiocyanate-free Ru(II) sensitizers with 4,4-dicarboxyvinyl-2,2-bipyridine anchor and two trans-oriented pyrid-2-yl pyrazolate (or triazolate) functional chromophores is synthesized, characterized, and evaluated in dye-sensitized solar cells ...

Wiley-Blackwell2013

Compounds for electrochemical and/or optoelectronic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin

The invention relates to substituted ullazine and analogs of ullazine as sensitizers for dye-sensitized solar cells (DSSCs) and other photoelectrochemical and/or optoelectronic devices. The sensitizers may comprise donor substituents and/oracceptor substit ...

2013

Low temperature crystalline titanium dioxide by atomic layer deposition for dye-sensitized solar cells

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Leo-Philipp Heiniger, Aswani Yella, Morgan Mertens Stefik

Low temperature processing of dye-sensitized solar cells (DSC) is crucial to enable commercialization with low-cost, plastic substrates. Prior studies have focused on mechanical compression of premade particles on plastic or glass substrates, however, this ...

Amer Chemical Soc2013

A Simple Synthetic Route to Obtain Pure Trans-Ruthenium(II) Complexes for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Davide Di Censo, Jun Ho Yum, Filippo de Angelis

We report a facile synthetic route to obtain functionalized quaterpyridine ligand and its trans-dithiocyanato ruthenium complex, based on a microwave-assisted procedure. The ruthenium complex has been purified using a silica chromatographic column by prote ...

Wiley-VCH Verlag Berlin2013

Effect of Interfacial Engineering in Solid-State Nanostructured Sb2S3 Heterojunction Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar, Thomas Moehl, Takafumi Fukumoto

Wiley-VCH Verlag Berlin2013

Redox properties of cobalt(II) complexes with azole-pyridines

Michael Graetzel, Mohammad Khaja Nazeeruddin

We report nine new homoleptic octahedral cobalt(II) complexes Co((NN)-N-boolean AND)(3) and Co((NNN)-N-boolean AND-N-boolean AND)(2) with bidentate or tridentate azole-pyridine ligands (where azole is 1,2,4-triazole or a substituted pyrazole). ...

Elsevier2013

Carbon-graphene nanocomposite cathodes for improved Co(II/III) mediated dye-sensitized solar cells

Michael Graetzel, Jun Ho Yum, Yelin Hu, Morgan Mertens Stefik

Cobalt-based electrolytes have significantly advanced the tunability and performance of dye-sensitized solar cells. The typically used platinum cathodes are expensive and non-optimal for cobalt complexes, motivating the search for replacements. Graphene na ...

Royal Society of Chemistry2013

Sequential deposition as a route to high-performance perovskite-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Soo-Jin Moon, Norman Pellet, Julian Burschka, Peng Gao

Following pioneering work(1), solution-processable organic-inorganic hybrid perovskites-such as CH3NH3PbX3 (X = Cl, Br, I)-have attracted attention as light-harvesting materials for mesoscopic solar cells(2-15). So far, the perovskite pigment has been depo ...

Nature Publishing Group2013

Formation of an electron hole doped film in the alpha-Fe2O3 photoanode upon electrochemical oxidation

Michael Graetzel, Artur Braun, Florent Alexandre Boudoire

Solar hydrogen generation by water splitting in photoelectrochemical cells (PEC) is an appealing technology for a future hydrogen economy. Hematite is a prospective photoanode material in this respect because of its visible light conjugated band gap, its c ...

Royal Society of Chemistry2013

Interpretation of Optoelectronic Transient and Charge Extraction Measurements in Dye-Sensitized Solar Cells

Michael Graetzel, Takeru Bessho, Xiong Li

Tools that assess the limitations of dye sensitized solar cells (DSSCs) made with new materials are critical for progress. Measuring the transient electrical signals (voltage or current) after optically perturbing a DSSC is an approach which can give infor ...

Wiley-Blackwell2013

In-situ Investigation of Adsorption of Dye and Coadsorbates on TiO2 Films Using QCM-D, Fluorescence and AFM Techniques

Michael Graetzel, Nicolas Tétreault, Francesco Stellacci, Kislon Voitchovsky, Hauke Arne Harms

Simultaneous adsorption of dye molecules and coadsorbates is important for the fabrication of high-efficiency dyesensitized solar cells, but its mechanism is not well understood. Herein, we use a quartz crystal microbalance with dissipation technique (QCM- ...

Spie-Int Soc Optical Engineering2013

Molecular Engineering of a Fluorene Donor for Dye-Sensitized Solar Cells

Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Joël Teuscher, Ursula Röthlisberger, Ivano Tavernelli, Basile Curchod, Negar Ashari Astani, Aswani Yella, Julien Edouard Frey, Simon Mathew, Lauren Elizabeth Polander

To improve their efficiency beyond the state-of-the-art, D-pi-A dyes must display increased spectral breadth and account for the physical limitations observed in the dye. sensitized solar cells. In particular, they should be designed to control the electro ...

Amer Chemical Soc2013

π-Conjugated Donor-Acceptor Systems as Metal-Free Sensitizers for Dye-Sensitized Solar Cell Applications

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Magdalena Anna Marszalek, Mateusz Barnaba Wielopolski

High extinction coefficients and easily tunable spectral properties of π - conjugated donor-acceptor dyes are of superior advantage for the design of new metal- free organic sensitizers for applications in dye-sensitized solar cells. Ultrafast transient ab ...

E D P Sciences2013

Engineering of thiocyanate-free Ru(II) sensitizers for high efficiency dye-sensitized solar cells

Michael Graetzel, Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Elham Ghadiri, Kuan-Lin Wu, Filippo de Angelis, Shilong Wang

We synthesized a series of Ru(II) metal complexes TFRS-1, -2, -4, -21, -22 and -24 with a single 4,40- dicarboxylic acid-2,20-bipyridine together with two functionalized pyridyl azolate ancillary ligands consisting of pyrazolate or triazolate groups. Both ...

Royal Soc Chemistry2013

Photovoltage enhancement from cyanobiphenyl liquid crystals and 4-tert-butylpyridine in Co(II/III) mediated dye-sensitized solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Nripan Mathews, Kazuteru Nonomura

Two cyanobiphenyl liquid crystals (LCs), 5CB (4-cyano-4'-pentylbiphenyl) and 8CB (4-cyano-4'-octylbiphenyl), are introduced as additives into Co(II/ III) electrolytes for dye-sensitized solar cells (DSCs). An electrolyte containing a combination of these L ...

Royal Society of Chemistry2013

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