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Michael Graetzel

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Publications associées (1 223)

Photoelectrochemical Hydrogen Production in Alkaline Solutions Using Cu2O Coated with Earth-Abundant Hydrogen Evolution Catalysts

Michael Graetzel, Xile Hu, Stanley David Tilley, Laurent Liardet, Carlos Gilberto Morales Guio, Matthew Thomas Mayer

The splitting of water into hydrogen and oxygen molecules using sunlight is an attractive method for solar energy storage. Until now, photoelectrochemical hydrogen evolution is mostly studied in acidic solutions, in which the hydrogen evolution is more fac ...

Wiley-Blackwell2015

Diketopyrrolopyrole (dpp)-based sensitizers for electrochemical or optoelectronic devices

Michael Graetzel, Mohammad Khaja Nazeeruddin, Jun Ho Yum, Thomas Wesley Holcombe

The present invention relates to compounds of formula (I) based on DPP moiety being useful as metal-free organic sensitizers or dyes of type D-Pi-A in electrochemical or optoelectronic devices, their use as sensitizer or dye and an electrochemical or optoe ...

2015

Highly Spin-Polarized Carrier Dynamics and Ultra large Photoinduced Magnetization in CH(3)NH(3)Pbl(3) Perovskite Thin Films

Michael Graetzel, Nripan Mathews

Low-temperature solution-processed organic-inorganic halide perovskite CH3NH3PbI3 has demonstrated great potential for photovoltaics and light-emitting devices. Recent discoveries of long ambipolar carrier diffusion lengths and the prediction of the Rashba ...

American Chemical Society2015

Outdoor Performance and Stability under Elevated Temperatures and Long-Term Light Soaking of Triple-Layer Mesoporous Perovskite Photovoltaics

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Manuel Tschumi, Xiong Li

Lack of proven stability has become a major obstacle on the path of metal halide perovskite solar cells (PSCs), in particular methylammonium lead triiodide (MAPbI(3)), towards commercial viability. This correlates with the intrinsic affinity of MAPbI(3) to ...

Wiley-V C H Verlag Gmbh2015

Molecular Engineering of Pyrido[3,4-b]pyrazine-Based Donor-Acceptor-pi- Acceptor Organic Sensitizers: Effect of Auxiliary Acceptor in Cobalt- and Iodine-Based Electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Fabrizio Giordano, Bo Liu

Due to the ease of tuning its redox potential, the cobalt-based redox couple has been extensively applied for highly efficient dye-sensitized solar cells (DSSCs) with extraordinarily high photovoltages. However, a cobalt electrolyte needs particular struct ...

Wiley-Blackwell2015

A dopant-free spirobi[cyclopenta[2,1-b:3,4-b ']dithiophene] based hole-transport material for efficient perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Amaresh Mishra, Jingshan Luo, Marius Franckevicius

We present the design and synthesis of a promising hole transporting material (HTM) using the 4,40-spirobi[cyclopenta[2,1-b: 3,4-b']dithiophene] derivative (spiro-CPDT) as the core and triarylamines as terminal units. The implementation of the new HTM in C ...

Royal Soc Chemistry2015

Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yonghui Lee

Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI(3)) perovskite absorber in a wide range of device architectures. However, the question as to which of these systems represents the most comm ...

Royal Society of Chemistry2015

Silolothiophene-linked triphenylamines as stable hole transporting materials for high efficiency perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Peng Gao, Fabrizio Giordano, Sanghyun Paek, Juan-Pablo Correa-Baena, Antonio Abate, Taisuke Matsui, Michael Saliba

In this work, we synthesized novel hole transporting materials (HTMs) and studied their impact on the stability of perovskite-based solar cells (PSCs). The steady-state maximum power output of devices in working condition was monitored to assess the stabil ...

Royal Society of Chemistry2015

Efficient photosynthesis of carbon monoxide from CO2 using perovskite photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Marcel Roland Schreier, Ludmilla Steier, Fabrizio Giordano, Matthew Thomas Mayer, Jingshan Luo, Antonio Abate

Artificial photosynthesis, mimicking nature in its efforts to store solar energy, has received considerable attention from the research community. Most of these attempts target the production of H-2 as a fuel and our group recently demonstrated solar-to-hy ...

Nature Publishing Group2015

Triazatruxene-Based Hole Transporting Materials for Highly Efficient Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Kasparas Rakstys, Gwénolé Jean Jacopin, Mohammad Ibrahim Dar, Antonio Abate

Four center symmetrical star-shaped hole transporting materials (HTMs) comprising planar triazatruxene core and electron-rich methoxy-engineered side arms have been synthesized and successfully employed in (FAPbI(3))(0.85)(MAPbBr(3))(0.15) perovskite solar ...

Amer Chemical Soc2015

High efficiency stable inverted perovskite solar cells without current hysteresis

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt

The inverted perovskite solar cell fabricated using a two-step method exhibited the highest FF of 0.85 and good efficiency of 18% based on CH3NH3PbI3. A small amount of H2O was added into PbI2/DMF to make a homogenous precursor solution. A high quality PbI ...

Royal Soc Chemistry2015

Cationic Iridium(III) Complexes with Two Carbene-Based Cyclometalating Ligands: Cis Versus Trans Isomers

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti

A series of cationic iridium(III) complexes with two carbene-based cyclometalating ligands and five different NN bipyridine and 1,10-phenanthroline ancillary ligands is presented. For the first time in the frame of a rarely studied class of bis(heterole ...

Amer Chemical Soc2015

Aqueous dye-sensitized solar cells

Michael Graetzel

Nowadays, dye-sensitized solar cells (DSSCs) are the most extensively investigated systems for the conversion of solar energy into electricity, particularly for implementation in devices where low cost and good performance are required. Nevertheless, a key ...

Royal Society of Chemistry2015

A Redox-Flow Electrochromic Window

Michael Graetzel, Shaik Mohammed Zakeeruddin

A low-cost electrochromic (EC) window based on a redox-flow system that does not require expensive transparent conductive oxide (TCO) substrates is introduced and demonstrated for the first time. An aqueous I-3/I redox electrolyte is used in place of a TCO ...

Amer Chemical Soc2015

Understanding the rate-dependent J-V hysteresis, slow time component, and aging in CH3NH3PbI3 perovskite solar cells: the role of a compensated electric field

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Thomas Moehl, Nevena Vaskova Marinova, Wolfgang Richard Tress

In this work we show that the rate-dependent hysteresis seen in current-voltage scans of CH3NH3PbI3 perovskite solar cells is related to a slow field-induced process that tends to cancel the electric field in the device at each applied bias voltage. It is ...

Royal Soc Chemistry2015

Spectral splitting photovoltaics using perovskite and wideband dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Ulf Anders Hagfeldt, Fabrizio Giordano, Kazuteru Nonomura, Antonio Abate

The extension of the light absorption of photovoltaics into the near-infrared region is important to increase the energy conversion efficiency. Although the progress of the lead halide perovskite solar cells is remarkable, and high conversion efficiency of ...

Nature Publishing Group2015

Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Peng Gao, Yonghui Lee, Jingshan Luo

The effect of the presence of unreacted PbI2 on the perovskite solar cells efficiency is reported. N,N-Dimethylformamide vapor treatment is introduced to study the influence of complete conversion to a power conversion efficiency of the device. It is disco ...

Wiley-Blackwell2015

Transforming Hybrid Organic Inorganic Perovskites by Rapid Halide Exchange

Michael Graetzel, Joël Teuscher, Norman Pellet, Joachim Maier

We report on rapid halide exchange in metal halide perovskite of the general formula MAPbX(3) (X = Cl, Br, or I). We find that when the perovskite is infiltrated in a mesoscopic scaffold, halide substitution on the perovskite lattice is strikingly fast, be ...

American Chemical Society2015

A hybrid electron donor comprising cyclopentadithiophene and dithiafulvenyl for dye-sensitized solar cells

Michael Graetzel, Chenyi Yi

Two new photosensitizers featured with a cyanoacrylic acid electron acceptor (A) and a hybrid electron donor (D) of cyclopentadithiophene and dithiafulvenyl, either directly linked or separated by a phenyl ring, were synthesized and characterized. Both of ...

Beilstein-Institut2015

Working Principles of Perovskite Photodetectors: Analyzing the Interplay Between Photoconductivity and Voltage-Driven Energy-Level Alignment

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Konrad Domanski, Wolfgang Richard Tress, Michael Saliba

Organic-inorganic lead halide perovskites have recently received significant attention as active materials for high-performance photovoltaics and photo-detectors. However, the understanding of their operation mechanism remains limited. High-gain, low-volta ...

Wiley-V C H Verlag Gmbh2015

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