Publications de Lioz Etgar | EPFL Graph Search

Investigation of Interfacial Charge Separation at PbS QDs/ (001) TiO2 Nanosheets Heterojunction Solar Cell

Michael Graetzel, Jacques-Edouard Moser, Elham Ghadiri, Lioz Etgar

In the recent years, the heterojunction solar cells based on quantum dots (QDs) have attracted attention due to strong light absorbing characteristics and the size effect on the bandgap tuning. This paper reports on the kinetics of interfacial charge separ ...

Wiley-Blackwell2015

A hybrid lead iodide perovskite and lead sulfide QD heterojunction solar cell to obtain a panchromatic response

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar, Peng Gao, Peng Qin

We report for the first time on co-sensitization between CH3NH3PbI3 perovskite and PbS quantum dots (QDs) in a heterojunction solar cell to obtain a panchromatic response from the visible to near IR regions. Following the deposition of the sensitizers on a ...

Royal Society of Chemistry2014

Organo metal halide perovskite heterojunction solar cell and fabrication thereof

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar

The present invention provides a solid state heterojunction solar cell comprising a transparent conducting support layer (2,3), on which a nanostructured, surface-increasing scaffold structure is provided, wherein an organic-inorganic perovskite layer (4) ...

2014

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

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

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

Light Energy Conversion by Mesoscopic PbS Quantum Dots/TiO2 Heterojunction Solar Cells

Michael Graetzel, Lioz Etgar, Thomas Moehl

Solid state PbS quantum dots (QDs)/TiO2 heterojunction solar cells were produced by depositing PbS QDs on a 500 nm thick mesoscopic TiO2 films using layer-by-layer deposition. Importantly, the PbS QDs act here as photosensitizers and at the same time as ho ...

American Chemical Society2012

Reducing recombination in ZnO photoanodes for dye sensitised solar cells through simple chemical synthesis

Michael Graetzel, Vincent Laporte, Lioz Etgar

A method has been developed to synthesise zinc oxide nanowire arrays that demonstrate superior device performance compared to conventional ZnO nanowires within dye sensitised solar cells (DSSCs). This simple yet effective methodology has produced nanowires ...

Royal Society of Chemistry2012

High Efficiency Quantum Dot Heterojunction Solar Cell Using Anatase (001) TiO2 Nanosheets

Michael Graetzel, Mohammad Khaja Nazeeruddin, Lioz Etgar, Wei Zhang

Wiley2012

Enhancing the efficiency of a dye sensitized solar cell due to the energy transfer between CdSe quantum dots and a designed squaraine dye

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Lioz Etgar

The power conversion efficiency of a dye-sensitized solar cell with tailored squaraine dye enhanced by 47%, due to Forster resonance energy transfer from CdSe quantum dots to the squaraine dye. The incident photons to collection efficiency of electrons ind ...

2012

Design and Development of Novel Linker for PbS Quantum Dots/TiO2 Mesoscopic Solar cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Guido Viscardi, Lioz Etgar

A novel bifunctional linker molecule, bis(4-mercaptophenyl)phosphinic acid, is designed to be used in a QDs solar cells. The linker anchors to TiO2 mesoporous film through the phosphinic acid functional group and to the PbS QDs through the two thiol groups ...

2011

Ga3+ and Y3+ Cationic Substitution in Mesoporous TiO2 Photoanodes for Photovoltaic Applications

Michael Graetzel, Aravind Kumar Chandiran, Lioz Etgar

The optoelectronic properties of transparent nanocrystalline TiO2 films were modified by the incorporation of a low level of Ga3+ or Y3+ cations. After optimizing their relative concentration level, we were able to increase in a noticeable manner the power ...

American Chemical Society2011

An efficient DSSC based on ZnO nanowire photo-anodes and a new D-pi-A organic dye

Michael Graetzel, Shaik Mohammed Zakeeruddin, Lioz Etgar, Peng Wang

Zinc oxide-titanium dioxide core-shell nanowire dye-sensitised solar cells have been synthesised, making use of a recently developed organic dye and iodide-based electrolyte. We have been able to demonstrate a cell efficiency of 2.53% under AM1.5 for our s ...

2011

Depleted Bulk Heterojunction Colloidal Quantum Dot Photovoltaics

Michael Graetzel, Lioz Etgar

The first solution-processed depleted bulk heterojunction colloidal quantum dot solar cells are presented. The architecture allows high absorption with full depletion, thereby breaking the photon absorption/carrier extraction compromise inherent in planar ...

Wiley2011