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Michael Graetzel

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Related publications (1,223)

A deep-blue emitting charged bis-cyclometallated iridium(III) complex for light-emitting electrochemical cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

We report here a new cationic bis-cyclometallated iridium(III) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2',6'-difluoro-2,3'-bipyridine skeleton as the cyclometallat ...

Royal Society of Chemistry2013

Enhancing the open circuit voltage of dye sensitized solar cells by surface engineering of silica particles in a gel electrolyte

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Lioz Etgar, Guillaume Schuchardt

We prepared a quasi-solid electrolyte for dye-sensitized solar cells (DSSCs) that consist of ionic liquid and modified silica particles. Commercial bare silica F5 particles and modified silica F5 by NH2 and NH3+ groups were prepared, and fully characterize ...

Royal Society of Chemistry2013

High Efficiency Solid-State Sensitized Solar Cell-Based on Submicrometer Rutile TiO2 Nanorod and CH3NH3PbI3 Perovskite Sensitizer

Michael Graetzel, Hui-Seon Kim

We report a highly efficient solar cell based on a submicrometer (similar to 0.6 mu m) rutile TiO2 nanorod sensitized with CH3NH3PbI3 perovskite nanodots. Rutile nanorods were grown hydrothermally and their lengths were varied through the control of the re ...

American Chemical Society2013

Core/Shell PbSe/PbS QDs TiO2 Heterojunction Solar Cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar

Quasi type-II PbSe/PbS quantum dots (QDs) are employed in a solid state high efficiency QD/TiO2 heterojunction solar cell. The QDs are deposited using layer-by-layer deposition on a half-micrometer-thick anatase TiO2 nanosheet film with (001) exposed facet ...

Wiley-Blackwell2013

Tridentate cobalt complexes as alternative redox couples for high-efficiency dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Kaïs Ben Aribia, Thomas Moehl

Cobalt terpyridine complexes could rival the classical triiodide/iodide redox couple as efficient alternative redox couples for dye-sensitized solar cells. Cobalt bis(2,2',6',2 ''-terpyridine) complexes enable systematic tuning of the redox potential by va ...

Royal Soc Chemistry2013

Benzo[1,2-b:4,5-b ']difuran-based sensitizers for dye-sensitized solar cells

Michael Graetzel, Chenyi Yi, Hongyu Li

Two BDF-based organic sensitizers, as first examples for their use in dye-sensitized solar cells, are prepared and characterized. They yield promising power conversion efficiencies of up to 5.5% and high open circuit voltages up to 0.82 V. This work demons ...

RSC Publishing2013

First Principles Design of Dye Molecules with Ullazine Donor for Dye Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Sheng Meng, Yunfei Jiao, Wanli Ma

We design a series of metal-free donor-pi-bridge molecules (denoted VB0-VB4) based on a new donor group-ullazine donor-as sensitizers for dye sensitized solar cell (DSSC) applications. Density functional theory (DFT) and time-dependent DFT calculations rev ...

American Chemical Society2013

Structure-Property Relations in All-Organic Dye-Sensitized Solar Cells

Michael Graetzel, Sheng Meng, Fan Zhang, Yunfei Jiao

A structureproperty relationship in all-organic dye solar cells is revealed by first-principles molecular dynamics and real-time time-dependent density functional theory simulations, accompanied with experimental confirmation. An important structural featu ...

Wiley-Blackwell2013

Identifying champion nanostructures for solar water-splitting

Michael Graetzel, Maurin Cornuz, Cécile Hébert, Scott Charles Warren, Francesco Stellacci, Kislon Voitchovsky

Charge transport in nanoparticle-based materials underlies many emerging energy-conversion technologies, yet assessing the impact of nanometre-scale structure on charge transport across micrometre-scale distances remains a challenge. Here we develop an app ...

Nature Publishing Group2013

Silicon protected with atomic layer deposited TiO2: durability studies of photocathodic H-2 evolution

Michael Graetzel

The semiconducting materials used for photoelectrochemical (PEC) water splitting must withstand the corrosive nature of the aqueous electrolyte over long time scales in order to be a viable option for large scale solar energy conversion. Here we demonstrat ...

Royal Soc Chemistry2013

Influence of 4-tert-Butylpyridine in DSCs with Co-II/III Redox Mediator

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

The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte a ...

American Chemical Society2013

Silicon protected with atomic layer deposited TiO2: conducting versus tunnelling through TiO2

Michael Graetzel, Stanley David Tilley

The present work demonstrates that tuning the donor density of protective TiO2 layers on a photocathode has dramatic consequences for electronic conduction through TiO2 with implications for the stabilization of oxidation-sensitive catalysts on the surface ...

Royal Society of Chemistry2013

Using a two-step deposition technique to prepare perovskite (CH3NH3PbI3) for thin film solar cells based on ZrO2 and TiO2 mesostructures

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt, Soo-Jin Moon, Lin Yang, Dongqin Bi

A two-step deposition technique is used for preparing CH3NH3PbI3 perovskite solar cells. Using ZrO2 and TiO2 as a mesoporous layer, we obtain an efficiency of 10.8% and 9.5%, respectively, under 1000 W m(-2) illumination. The ZrO2 based solar cell shows hi ...

RSC Publishing2013

Diketopyrrolopyrrole-based sensitizers for dye-sensitized solar cell applications: anchor engineering

Michael Graetzel, Jun Ho Yum, Thomas Wesley Holcombe, Kasparas Rakstys, Yongjoo Kim

A series of donor-chromophore-anchor (D-C-A) sensitizers comprising the diketopyrrolopyrrole (DPP) chromophore were synthesized and tested in both I-3(-)/I- and Co(bpy) redox shuttle DSC devices. The dye series was strategically designed to elucid ...

Royal Society of Chemistry2013

Molecular Engineering of Organic Dyes for Improved Recombination Lifetime in Solid-State Dye-Sensitized Solar Cells

Michael Graetzel, Thomas Moehl, Julian Burschka

A major limitation of solid-state dye-sensitized solar cells is a short electron diffusion length, which is due to fast recombination between electrons in the TiO2 electron-transporting layer and holes in the 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine) ...

American Chemical Society2013

See-Through Dye-Sensitized Solar Cells: Photonic Reflectors for Tandem and Building Integrated Photovoltaics

Michael Graetzel, Nicolas Tétreault, Leo-Philipp Heiniger, Yang Yang

See-through dye-sensitized solar cells with 1D photonic crystal Bragg reflector photoanodes show an increase in peak external quantum efficiency of 47% while still maintaining high fill factors, resulting in an almost 40% increase in power conversion effic ...

Wiley-Blackwell2013

Application of graphene-based nanostructures in dye-sensitized solar cells

Michael Graetzel, Ladislav Kavan, Jun Ho Yum

The paper reviews recent advances in the application of graphene and related materials, viz. graphene nanoplatelets (GNP), functionalized graphene sheets (FGS), graphene oxide (GO), and reduced graphene oxide (rGO) as electrode building materials in dye-se ...

Wiley-Blackwell2013

Phosphorescence of iridium(III) complexes with 2-(2-pyridyl)-1,3,4-oxadiazoles

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

Cationic bis-cyclometalated iridium(III) complexes (C boolean AND N)(2)Ir(N boolean AND N) with 2-(2'-pyridyl)-5-R-1,3,4-oxadiazoles (N boolean AND N; R = 1-adamantyl, mesityl, N-diphenylamino) have a redox gap of 2.58-2.68 V and exhibit orange-red ...

Elsevier2013

Improved Nonaqueous Synthesis of TiO2 for Dye-Sensitized Solar Cells

Michael Graetzel, Morgan Mertens Stefik, Markus Niederberger

Nonaqueous synthesis routes have emerged as a powerful platform for directly obtaining diverse metal oxide nanoparticles with high crystallinity and tunable compositions. The benzyl alcohol (BA) route, for example, has been applied toward dozens of oxides ...

American Chemical Society2013

Flexible, low-temperature, solution processed ZnO-based perovskite solid state solar cells

Michael Graetzel, Nripan Mathews

A ZnO compact layer formed by electrodeposition and ZnO nanorods grown by chemical bath deposition (CBD) allow the processing of low-temperature, solution based and flexible solid state perovskite CH3NH3PbI3 solar cells. Conversion efficiencies of 8.90% we ...

Royal Society of Chemistry2013

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