Publications de Nicolas Tétreault

The Nexus between Agriculture, Water, Energy and Environmental Degradation in Central Asia-Empirical Evidence Using Panel Data Models

The primary aspiration of this paper is to learn about the effects of economic growth, energy consumption, agriculture and irrigation water consumption and agriculture productivity on environmental pollution in five countries of Central Asia. The data cove ...

2023

Decentralized green energy transition promotes peace

Michael Lehning, Nicolas Tétreault, Julia Steinberger

FRONTIERS MEDIA SA2023

Efficient Near-Infrared-Transparent Perovskite Solar Cells Enabling Direct Comparison of 4-Terminal and Monolithic Perovskite/Silicon Tandem Cells

Christophe Ballif, Sylvain Nicolay, Soo-Jin Moon, Arnaud Walter, Davide Sacchetto, Nicolas Tétreault, Stefaan De Wolf, Matthieu Despeisse, Jérémie Werner, Florent Sahli, Loris Barraud, Bertrand Yves Paul Paviet-Salomon, Björn Niesen, Matthias Wolfgang Bräuninger

Combining market-proven silicon solar cell technology with an efficient wide band gap top cell into a tandem device is an attractive approach to reduce the cost of photovoltaic systems. For this, perovskite solar cells are promising high-efficiency top cel ...

Amer Chemical Soc2016

In-situ mapping of the molecular arrangement of amphiphilic dye molecules at the TiO2 surface of dye sensitized solar cells

Michael Graetzel, Ursula Röthlisberger, Ivano Tavernelli, Nicolas Tétreault, Negar Ashari Astani, Francesco Stellacci, Kislon Voitchovsky, Hauke Arne Harms

Amphiphilic sensitizers are central to the function of dye-sensitized solar cells. It is known that the cells performance depends on the molecular arrangement and the density of the dye on the semiconductor surface, but a molecular-level picture of the cel ...

2015

A Novel Oligomer as a Hole Transporting Material for Efficient Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Peng Gao, Peng Qin, Mohammad Ibrahim Dar

(Figure Presented) A polytriarylamine-based oligomer is reported as a hole transporting material and its application in solid-state CH3NH3PbI3 based heterojunction solar cells is described. It yields a power conversion efficiency of 12.0% under 99.6 mW cm- ...

Wiley-VCH Verlag Berlin2015

Control and Study of the Stoichiometry in Evaporated Perovskite Solar Cells

Michael Graetzel, Joël Teuscher, Nicolas Tétreault

Herein, we present the precise stoichiometric control of methlyammonium lead iodide perovskite thin-films using high vacuum dual-source vapor-phase deposition. We found that UV/Vis absorption and emission spectra were inadequate for assessing precisely the ...

Wiley-VCH Verlag Berlin2015

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

Inorganic hole conductor-based lead halide perovskite solar cells with 12.4% conversion efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Peng Qin

Organo-lead halide perovskites have attracted much attention for solar cell applications due to their unique optical and electrical properties. With either low-temperature solution processing or vacuum evaporation, the overall conversion efficiencies of pe ...

Nature Publishing Group2014

Electrochemical Characterization of TiO2 Blocking Layers for Dye-Sensitized Solar Cells

Michael Graetzel, Ladislav Kavan, Nicolas Tétreault, Thomas Moehl

Thin compact layers of TiO2 are grown by thermal oxidation of Ti, by spray pyrolysis, by electrochemical deposition, and by atomic layer deposition. These layers are used in dye-sensitized solar cells to prevent recombination of electrons from the substrat ...

American Chemical Society2014

Effect of Annealing Temperature on Film Morphology of Organic-Inorganic Hybrid Pervoskite Solid-State Solar Cells

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

Organic-inorganic hybrid perovskites have attracted attention as successful light harvesting materials for mesoscopic solid-state solar cells and led to record breaking efficiencies. The photovoltaic performance of these devices is greatly dependent on the ...

Wiley-Blackwell2014

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

Passivation of ZnO Nanowire Guests and 3D Inverse Opal Host Photoanodes for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Aravind Kumar Chandiran, Thomas Moehl, Hauke Arne Harms, Philippe Pierre Labouchère

A hierarchical host-guest nanostructured photoanode is reported for dye-sensitized solar cells. It is composed of ZnO nanowires grown in situ into the macropores of a 3D ZnO inverse opal structure, which acts both as a seed layer and as a conductive backbo ...

Wiley-VCH Verlag Berlin2014

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

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

Sub-nanometer Ga2O3 tunnelling layer by atomic layer deposition to achieve 1.1V open-circuit potential in dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Nicolas Tétreault, Aravind Kumar Chandiran, Chenyi Yi

Herein, we present the first use of a gallium oxide tunnelling layer to significantly reduce electron recombination in dye-sensitized solar cells (DSC). The sub-nanometer coating is achieved using atomic layer deposition (ALD) and leading to a new DSC reco ...

American Chemical Society2012

A Ga2O3 underlayer as an isomorphic template for ultrathin hematite films toward efficient photoelectrochemical water splitting

Michael Graetzel, Maurin Cornuz, Kevin Sivula, Florian Le Formal, Jérémie Minh-Châu Brillet, Nicolas Tétreault, Takashi Hisatomi

Hematite photoanodes for photoelectrochemical (PEC) water splitting are often fabricated as extremely-thin films to minimize charge recombination because of the short diffusion lengths of photoexcited carriers. However, poor crystallinity caused by structu ...

2012

Novel nanostructures for next generation dye-sensitized solar cells

Michael Graetzel, Nicolas Tétreault

Herein, we review our latest advancements in nanostructured photoanodes for next generation photovoltaics in general and dye-sensitized solar cells in particular. Bottom-up self-assembly techniques are developed to fabricate large-area 3D nanostructures th ...

Royal Society of Chemistry2012

In situ investigation of dye adsorption on TiO2 films using a quartz crystal microbalance with a dissipation technique

Michael Graetzel, Bengt Kasemo, Nicolas Tétreault, Hauke Arne Harms

Dye adsorption plays a crucial role in dye-sensitized solar cells. Herein, we demonstrate an in situ liquid- phase analytical technique to quantify in real time adsorption of dye and coadsorbates on flat and mesoporous TiO2 films. For the first time, a mol ...

2012

Improved electrode

Michael Graetzel, Jérémie Minh-Châu Brillet, Nicolas Tétreault

The present invention provides a generic electrode for photovoltaics, water splitting cells or any electro-chemical device where a three-dimensional transparent conductive backbone provides efficient charge extraction and can support an active guest materi ...

2011

High-Efficiency Dye-Sensitized Solar Cell with Three-Dimensional Photoanode

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jérémie Minh-Châu Brillet, Nicolas Tétreault, Thomas Moehl, Leo-Philipp Heiniger

Herein, we present a straightforward bottom-up synthesis of a high electron mobility and highly light scattering macroporous photoanode for dye-sensitized solar cells. The dense three-dimensional Al/ZnO, SnO2, or TiO2 host integrates a conformal passivatio ...

American Chemical Society2011