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Michael Graetzel

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Publications associées (1 223)

Facile route to freestanding CH3NH3PbI3 crystals using inverse solubility

Michael Graetzel, Ulf Anders Hagfeldt, Jeannette Medina Kadro, Kazuteru Nonomura

CH3NH3PbI3 was found to exhibit inverse solubility at high temperatures in gamma-butyrolactone. Making use of this unusual, so far unreported phenomenon, we present a facile method for the growth of freestanding crystals of CH3NH3PbI3 from solution without ...

Nature Publishing Group2015

Targeting Ideal Dual-Absorber Tandem Water Splitting Using Perovskite Photovoltaics and CuInxGa1-xSe2 Photocathodes

Michael Graetzel, Mohammad Khaja Nazeeruddin, Marcel Roland Schreier, Stanley David Tilley, Yonghui Lee, Matthew Thomas Mayer, Jingshan Luo, Kunwu Fu

Efficient sunlight-driven water splitting devices can be achieved by pairing two absorbers of different optimized bandgaps in an optical tandem design. With tunable absorption ranges and cell voltages, organic-inorganic metal halide perovskite solar cells ...

Wiley-V C H Verlag Gmbh2015

Direct monitoring of ultrafast electron and hole dynamics in perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Francisco Javier Ramos Mellado

Organic-inorganic hybrid perovskite solar cells have emerged as cost effective efficient light-toelectricity conversion devices. Unravelling the time scale and the mechanisms that govern the charge carrier dynamics is of paramount importance for a clear un ...

Royal Society of Chemistry2015

Electron Kinetics in Dye Sensitized Solar Cells Employing Anatase with (101) and (001) Facets

Pascal Comte, Michael Graetzel, Mohammad Khaja Nazeeruddin, Ladislav Kavan, Thomas Moehl, Aswani Yella

Two phase-pure nanocrystalline anatase materials differing in the exposed crystal facets (001) or (101) are studied by electrochemical impedance spectroscopy and by transient photovoltage and photocurrent decay in dye sensitized solar cells. A larger chemi ...

Elsevier2015

Low-temperature, solution-deposited metal chalcogenide films as highly efficient counter electrodes for sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Linhua Hu, Feng Liu, Bing Zhang

Transition metal chalcogenide crystalline films FeSe2, Cu1.8S, and CuSe have been deposited from solution by drop casting their dissolved inks onto a conductive substrate, followed by a mild thermal treatment. We demonstrate that the resulting chalcogenide ...

Royal Society of Chemistry2015

A dopant free linear acene derivative as a hole transport material for perovskite pigmented solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Francisco Javier Ramos Mellado

A solution processable, molecular organic semiconductor, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene), was employed as hole transport material (HTM) in mesoscopic methylammonium lead iodide perovskite solar cells. TIPS-pentacene is potenti ...

Royal Soc Chemistry2015

High-efficiency and stable quasi-solid-state dye-sensitized solar cell based on low molecular mass organogelator electrolyte

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yen-Huan Li, Xu Pan, Yong Ding, Bing Zhang, Lu Wang, Li Tao

The highest photoelectric conversion efficiency (9.61%) for a quasi-solid-state DSSC (QS-DSSC) based on a low molecular mass organogelator (LMOG) is achieved using N, N'-1,5-pentanediylbis-dodecanamide as a LMOG in conjunction with a TiO2 photoanode of sub ...

Royal Society of Chemistry2015

Hyperbranched self-assembled photoanode for high efficiency dye-sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Luca Passoni, Fabrizio Giordano

The photoanode morphology is key for improving photovoltaic performance of dye-sensitized solar cells. On one side, light harvesting depends on its capability of both chemisorbing high quantity of dye and affecting the flow of light in order to enhance its ...

RSC Publishing2015

Vacuum-Assisted Thermal Annealing of CH3NH3PbI3 for Highly Stable and Efficient Perovskite Solar Cells

Michael Graetzel, Di Zhang, Huimin Su

Solar cells incorporating lead halide-based perovskite absorbers can exhibit impressive power conversion efficiencies (PCEs), recently surpassing 15%. Despite rapid developments, achieving precise control over the morphologies of the perovskite films (mini ...

American Chemical Society2015

Synthesis of Amphiphilic Ru-II Heteroleptic Complexes Based on Benzo[1,2-b:4,5-b]dithiophene: Relevance of the Half-Sandwich Complex Intermediate and Solvent Compatibility

Michael Graetzel, Mohammad Khaja Nazeeruddin

The detailed synthesis and characterization of four ruthenium(II) complexes [RuLL(NCS)(2)] is reported, in which L represents a 2,2-bipyridine ligand functionalized at the 4,4 positions with benzo[1,2-b:4,5-b]dithiophene derivatives (BDT) and L is 2,2-bipy ...

Wiley-Blackwell2015

Transparent Cuprous Oxide Photocathode Enabling a Stacked Tandem Cell for Unbiased Water Splitting

Michael Graetzel, Ulf Anders Hagfeldt, Marcel Roland Schreier, Stanley David Tilley, Matthew Thomas Mayer, Jingshan Luo, Dongqin Bi

Photoelectrochemical water splitting represents an attractive method of capturing and storing the immense energy of sunlight in the form of hydrogen, a clean chemical fuel. Given the large energetic demand of water electrolysis, and the defined spectrum of ...

Wiley-VCH Verlag Berlin2015

A-D-A-type S,N-heteropentacene-based hole transport materials for dopant-free perovskite solar cells

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

This work reports the design and synthesis of acceptor-donor-acceptor (A-D-A) type low band gap hole transport materials (HTM) comprising S,N-heteropentacene central units for solid-state perovskite-based solar cells. The optical and electrochemical proper ...

Royal Society of Chemistry2015

Robust High-performance Dye-sensitized Solar Cells Based on Ionic Liquid-sulfolane Composite Electrolytes

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Paul Joseph Dyson, Thomas Moehl, Pui Shan Genevieve Lau

Novel ionic liquid-sulfolane composite electrolytes based on the 1,2,3-triazolium family of ionic liquids were developed for dye-sensitized solar cells. The best performing device exhibited a short-circuit current density of 13.4 mA cm(-2), an open-circuit ...

Nature Publishing Group2015

High performance dye-sensitized solar cells with inkjet printed ionic-liquid electrolyte

Michael Graetzel, Shaik Mohammed Zakeeruddin, Syed Ghufran Hashmi

We successfully inkjet printed an ionic liquid electrolyte in the dye-sensitized solar cell (DSSC) as a part of a new cell fabrication sequence that eliminates drilling holes in the DSSC substrates. The inkjet printing of ionic liquid electrolyte does not ...

Elsevier Science Bv2015

Highly efficient planar perovskite solar cells through band alignment engineering

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Ludmilla Steier, Fabrizio Giordano, Wolfgang Richard Tress, Antonio Abate, Taisuke Matsui, Michael Saliba, Tor Jesper Jacobsson

The simplification of perovskite solar cells (PSCs), by replacing the mesoporous electron selective layer (ESL) with a planar one, is advantageous for large-scale manufacturing. PSCs with a planar TiO2 ESL have been demonstrated, but these exhibit unstabil ...

Royal Society of Chemistry2015

Photovoltaic behaviour of lead methylammonium triiodide perovskite solar cells down to 80 K

Michael Graetzel, Shaik Mohammed Zakeeruddin, Hua Zhang, Mingkui Wang, Thomas Moehl

We have tested the photovoltaic metrics of CH3NH3PbI3 perovskite solar cells over a wide temperature range from 80-360 K. Our investigation reveals that the open-circuit voltage reaches a maximum value at about 200 K close to the phase transition from tetr ...

Royal Society of Chemistry2015

Nanowire Perovskite Solar Cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Norman Pellet, Thomas Moehl, Peng Gao, Jingshan Luo, Jeong-Hyeok Im, Marius Franckevicius

Organolead iodide perovskite, CH3NH3PbI3, was prepared in the form of nanowire by means of a small quantity of aprotic solvent in two-step spin-coating procedure. One-dimensional nanowire perovskite with the mean diameter of 100 nm showed faster carrier se ...

American Chemical Society2015

Perovskite-Hematite Tandem Cells for Efficient Overall Solar Driven Water Splitting

Michael Graetzel, Nripan Mathews

Photoelectrochemieal water splitting half reactions on semiconducting photoelectrodes have received much attention but efficient overall water splitting driven by a single photoelectrode has remained elusive due to stringent electronic and thermodynamic pr ...

American Chemical Society2015

Understanding the Impact of Bromide on the Photovoltaic Performance of CH3NH3PbI3 Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Mojtaba Abdi Jalebi, Mohammad Ibrahim Dar, Neha Arora

An optimum amount of lead bromide (1%) can enhance the power conversion efficiency of CH3NH3PbI3-xBrx (where x approximate to 0) devices from 14.7% to 16.9% without altering the bandgap of the perovskite material. ...

Wiley-V C H Verlag Gmbh2015

Rational design of triazatruxene-based hole conductors for perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Kasparas Rakstys

Triazatruxene core based hole transporting materials (HTMs), HMDI (5,10,15-trihexyl-3,8,13-trimethoxy-10,15-dihydro-5H-diindolo[3,2-a: 3',2'-c]carbazole) and HPDI (5,10,15-tris(4-(hexyloxy)phenyl)-10,15-dihydro-5H-diindolo[3,2-a: 3',2'-c]carbazole) were sy ...

Royal Soc Chemistry2015

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