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Michael Graetzel

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Related publications (1,223)

Device and method for performing maximum power point tracking for photovoltaic devices in presence of hysteresis

Michael Graetzel, Shaik Mohammed Zakeeruddin, Norman Pellet, Fabrizio Giordano

A photovoltaic system including a solar cell having a hysteretic behavior; and a power device configured to extract a maximum power from the solar cell by forcing power oscillations of the power output by the solar cell. ...

2018

How the formation of interfacial charge causes hysteresis in perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Wolfgang Richard Tress, Silver Hamill Turren Cruz

In this study, we discuss the underlying mechanism of the current-voltage hysteresis in a hybrid lead-halide perovskite solar cell. We have developed a method based on Kelvin probe force microscopy that enables mapping charge redistribution in an operating ...

ROYAL SOC CHEMISTRY2018

From Organics to Photochemistry - GDCh-Meetings in September

Michael Graetzel

WILEY-V C H VERLAG GMBH2018

Interpretation and evolution of open-circuit voltage, recombination, ideality factor and subgap defect states during reversible light-soaking and irreversible degradation of perovskite solar cells

Michael Graetzel, Konrad Domanski, Björn Niesen, Wolfgang Richard Tress, Pankaj Kumar Yadav, Mozhgan Yavari

2018

Correction: Interpretation and evolution of open-circuit voltage, recombination, ideality factor and subgap defect states during reversible light-soaking and irreversible degradation of perovskite solar cells (vol 11, pg 151, 2018)

Michael Graetzel, Konrad Domanski, Björn Niesen, Wolfgang Richard Tress, Pankaj Kumar Yadav, Mozhgan Yavari

2018

Temperature dependent two-photon photoluminescence of CH3NH3PbBr3: structural phase and exciton to free carrier transition

Michael Graetzel, Jeannette Medina Kadro, Antonio Abate, Michael Saliba

2018

Novel p-dopant toward highly efficient and stable perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Marko Stojanovic, Jiyoun Seo, Hui-Seon Kim, Seckin Akin

Li-TFSI is the most common p-dopant for the hole conductor spiro-MeOTAD in the normal structure (n-i-p) of perovskite solar cells (PSCs), which consistently yield the highest power conversion efficiency (PCE) albeit at the risk of lower long-term operation ...

ROYAL SOC CHEMISTRY2018

High Open Circuit Voltage for Perovskite Solar Cells with S,Si-Heteropentacene-Based Hole Conductors

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Amaresh Mishra, Neha Arora

High photovoltage in perovskite solar cells (PSCs) can be achieved by designing new hole transporting materials (HTMs) with relatively deeper energy levels of the highest occupied molecular orbital (HOMO). Here, we report on the synthesis of a new heteroac ...

WILEY-V C H VERLAG GMBH2018

Template synthesis of methylammonium lead iodide in the matrix of anodic titanium dioxide via the direct conversion of electrodeposited elemental lead

Michael Graetzel

A new processing technique is proposed for composites based on the hybrid organic inorganic perovskite MeNH3PbI3 and anodic titania nanotube arrays, which includes a direct gas phase conversion of metal lead nanorods electrodeposited inside the pores of an ...

ELSEVIER SCIENCE BV2018

Low threshold and efficient multiple exciton generation in halide perovskite nanocrystals

Michael Graetzel, Nripan Mathews, Qiang Xu, Mingjie Li

Multiple exciton generation (MEG) or carrier multiplication, a process that spawns two or more electron-hole pairs from an absorbed high-energy photon (larger than two times bandgap energy E-g, is a promising way to augment the photocurrent and overcome th ...

Nature Publishing Group2018

Greener, Nonhalogenated Solvent Systems for Highly Efficient Perovskite Solar Cells

Michael Graetzel, Ulf Anders Hagfeldt, Michael Saliba, Silver Hamill Turren Cruz, Mozhgan Yavari, Mohammad Mahdi Tavakoli

All current highest efficiency perovskite solar cells (PSCs) use highly toxic, halogenated solvents, such as chlorobenzene (CB) or toluene (TLN), in an antisolvent step or as solvent for the hole transporter material (HTM). A more environmentally friendly ...

WILEY-V C H VERLAG GMBH2018

Electrodeposition of porous CuSCN layers as hole-conducting material for perovskite solar cells

Michael Graetzel

One of the most promising among hole-conducting materials, CuSCN, was prepared for the first time in a form of porous layers for potential applications in inverted perovskite solar cells. ...

ELSEVIER SCIENCE BV2018

Addition of adamantylammonium iodide to hole transport layers enables highly efficient and electroluminescent perovskite solar cells

Michael Graetzel, Dominik Józef Kubicki, Wolfgang Richard Tress, David Lyndon Emsley, Mohammad Mahdi Tavakoli, Jovana Milic

The efficiency of perovskite solar cells (PSCs) is currently limited by non-radiative recombination losses. One potential loss channel consists of electrons recombining at the interface with the hole transport layer (HTL). We synthesized adamantylammonium ...

ROYAL SOC CHEMISTRY2018

Insights about the Absence of Rb Cation from the 3D Perovskite Lattice: Effect on the Structural, Morphological, and Photophysical Properties and Photovoltaic Performance

Michael Graetzel, Shaik Mohammed Zakeeruddin, Silvia Binet, Gwénolé Jean Jacopin, Mohammad Ibrahim Dar, Neha Arora, Ryusuke Uchida

Efficiencies >20% are obtained from the perovskite solar cells (PSCs) employing Cs+ and Rb+ based perovskite compositions; therefore, it is important to understand the effect of these inorganic cations specifically Rb+ on the properties of perovskite struc ...

WILEY-V C H VERLAG GMBH2018

Kinetics of Ion-Exchange Reactions in Hybrid Organic-Inorganic Perovskite Thin Films Studied by In Situ Real-Time X-ray Scattering

Michael Graetzel, Mohammad Ibrahim Dar, Neha Arora

The exchange of ions in hybrid organic inorganic perovskites with the general formula APbX(3) (A = MA, FA; X = I, Cl, Br) is studied in five different systems using in situ real-time grazing incident X-ray diffraction (GIXD). In systems where the organic c ...

AMER CHEMICAL SOC2018

Slow CH3NH3+ Diffusion in CH3NH3PbI3 under Light Measured by Solid-State NMR and Tracer Diffusion

Michael Graetzel, Joachim Maier, Alessandro Senocrate

We investigate methylammonium (MA) transport in MA lead iodide under illumination and show this, as in the dark, to be measurable but negligible when compared with the major carriers. H-1 and C-13 nuclear magnetic resonance (NMR) spectra show constant line ...

AMER CHEMICAL SOC2018

Mixed cation perovskite solid state solar cell and fabrication thereof

Michael Graetzel, Shaik Mohammed Zakeeruddin, Konrad Domanski, Wolfgang Richard Tress, Jiyoun Seo, Taisuke Matsui, Michael Saliba

A perovskite material including an organic-inorganic perovskite structure of formula (I), AnMX3 (I), n being the number of cation A and an integer >4, A being a monovalent cation selected from inorganic cations Ai and/or from organic cations Ao, M being a ...

2018

Analysis of Optical Losses in a Photoelectrochemical Cell: A Tool for Precise Absorptance Estimation

Michael Graetzel, Ludmilla Steier

Optical losses in a photoelectrochemical (PEC) cell account for a substantial part of solar-to-hydrogen conversion losses, but limited attention is paid to the detailed investigation of optical losses in PEC cells. In this work, an optical model of combine ...

Wiley-Blackwell2018

Inorganic hole conductor based perovskite photoelectric conversion device with high operational stability at long term

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Neha Arora

The invention relates to an optoelectronic and/or photoelectrochemical device comprising a conductive support layer, n-type semiconductor, a sensitizer or light-absorber layer, a hole transporting layer, a spacer layer and a back contact, wherein the n-typ ...

2018

Method for inkjet printing an organic-inorganic perovskite

Michael Graetzel, Shaik Mohammed Zakeeruddin, Syed Ghufran Hashmi, Xiong Li

The present invention provides a method for depositing an organic-inorganic perovskite, the method comprising the step of depositing a perovskite precursor solution comprising one or more organic cation, wherein said precursor solution is preferably deposi ...

2018

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