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Shaik Mohammed Zakeeruddin

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Publications associées (534)

Effect of Coordination Sphere Geometry of Copper Redox Mediators on Regeneration and Recombination Behavior in Dye-Sensitized Solar Cell Applications

Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Joël Teuscher, Ulf Anders Hagfeldt, Marko Stojanovic, Fabrizio Giordano, Yasemin Saygili, Marina Freitag, Jan Tiepelt

The recombination of injected electrons with oxidized redox species and regeneration behavior of copper redox mediators are investigated for four copper complexes, [Cu(dmby)2]2+/1+ (dmby = 6,6′-dimethyl-2,2′- bipyridine), [Cu(tmby)2]2+/1+ (tmby = 4,4′,6,6′ ...

2018

Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Ladislav Kavan, Ulf Anders Hagfeldt, Chenyi Yi, Yiming Cao, Jingshan Luo, Yasemin Saygili, Heewon Bahng, Weiwei Zhang, Yuhang Liu, Yinghui Wu

The relatively large voltage loss (Vloss) in excitonic type solar cells severely limits their power conversion efficiencies (PCEs). Here, we report a comprehensive control of Vloss through efficacious engineering of the sensitizer and redox mediator, makin ...

2018

Formation of Stable Mixed Guanidinium–Methylammonium Phases with Exceptionally Long Carrier Lifetimes for High-Efficiency Lead Iodide-Based Perovskite Photovoltaics

Shaik Mohammed Zakeeruddin, Norman Pellet, Dominik Józef Kubicki, David Lyndon Emsley, Dongqin Bi, Albert Hofstetter, Pankaj Kumar Yadav, Daniel Prochowicz

Methylammonium (MA)- and formamidinium (FA)-based organic-inorganic lead halide perovskites provide outstanding performance as photovoltaic materials, due to their versatility of fabrication and their power conversion efficiencies reaching over 22%. The pr ...

2018

Multifunctional molecular modulators for perovskite solar cells with over 20% efficiency and high operational stability

Shaik Mohammed Zakeeruddin, Pierre Mettraux, Norman Pellet, Dominik Józef Kubicki, Xiong Li, Jingshan Luo, David Lyndon Emsley, Dongqin Bi, Jovana Milic

Perovskite solar cells present one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at the molecular level remain challenging. We demonstrate a concept of multifunctional molecular modulation of scalable an ...

Nature Research2018

Hydrothermally processed CuCrO2 nanoparticles as an inorganic hole transporting material for low-cost perovskite solar cells with superior stability

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Yuhang Liu, Seckin Akin

Despite the impressive photovoltaic performances of perovskite solar cells (PSCs) with a power conversion efficiency (PCE) beyond 22%, intensive studies are still required to overcome ongoing issues such as cost, stability, and hysteresis. Here, for the fi ...

Royal Society of Chemistry2018

Redox melts formed by copper (i)/(ii) complexes as charge transfer and charge storage materials

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Yiming Cao, Marko Stojanovic, Marina Freitag

The present invention relates to a redox copper complex melt comprising a metalorganic complex of formula (I) [Cu (La) n ] (I), wherein n is an integer 2; and La is a bidentate ligand selected from a ligand according to any one of formulae (1) and (2): ...

2018

Reduced Graphene Oxide as a Stabilizing Agent in Perovskite Solar Cells

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

One of the most challenging obstacles to commercialization of perovskite solar cells (PSCs) is their instability toward environmental conditions. An emerging solution to overcome these challenges relies on graphene-based composites, in particular, solution ...

WILEY2018

Stable and Efficient Organic Dye-Sensitized Solar Cell Based on Ionic Liquid Electrolyte

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jean-David Décoppet, Yiming Cao, Lin Yang, Peng Wang, Jing Zhang

Dye-sensitized solar cells (DSCs) for outdoor applications must show both high efficiency and long-term stability. Here we introduce a co-sensitized, ionic liquid electrolyte-based DSC meeting these requirements. A key feature of our embodiment is the conc ...

CELL PRESS2018

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

A Stable Blue Photosensitizer for Color Palette of Dye-Sensitized Solar Cells Reaching 12.6% Efficiency

Shaik Mohammed Zakeeruddin, Hoi Nok Tsao, Yiming Cao

2018

Adamantanes Enhance the Photovoltaic Performance and Operational Stability of Perovskite Solar Cells by Effective Mitigation of Interfacial Defect States

Shaik Mohammed Zakeeruddin, Dongqin Bi, Linfeng Pan, Mohammad Mahdi Tavakoli

2018

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Shaik Mohammed Zakeeruddin

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Effect of Coordination Sphere Geometry of Copper Redox Mediators on Regeneration and Recombination Behavior in Dye-Sensitized Solar Cell Applications

Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

Formation of Stable Mixed Guanidinium–Methylammonium Phases with Exceptionally Long Carrier Lifetimes for High-Efficiency Lead Iodide-Based Perovskite Photovoltaics

Multifunctional molecular modulators for perovskite solar cells with over 20% efficiency and high operational stability

Hydrothermally processed CuCrO2 nanoparticles as an inorganic hole transporting material for low-cost perovskite solar cells with superior stability

Redox melts formed by copper (i)/(ii) complexes as charge transfer and charge storage materials

Reduced Graphene Oxide as a Stabilizing Agent in Perovskite Solar Cells

Stable and Efficient Organic Dye-Sensitized Solar Cell Based on Ionic Liquid Electrolyte

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

A Stable Blue Photosensitizer for Color Palette of Dye-Sensitized Solar Cells Reaching 12.6% Efficiency

Adamantanes Enhance the Photovoltaic Performance and Operational Stability of Perovskite Solar Cells by Effective Mitigation of Interfacial Defect States

Alternative bases to 4-tert-butylpyridine for dye-sensitized solar cells employing copper redox mediator

An investigation of the roles furan versus thiophene t -bridges play in donor -a -acceptor porphyrin based DSSCst

Boosting the Efficiency of Perovskite Solar Cells with CsBr-Modified Mesoporous TiO2 Beads as Electron-Selective Contact

Direct Contact of Selective Charge Extraction Layers Enables High-Efficiency Molecular Photovoltaics

Elucidation of Charge Recombination and Accumulation Mechanism in Mixed Perovskite Solar Cells

Highly Efficient Perovskite Solar Cells with Gradient Bilayer Electron Transport Materials

Impact of Peripheral Groups on Phenothiazine-Based Hole-Transporting Materials for Perovskite Solar Cells

Influence of redox electrolyte on the device performance of phenothiazine based dye sensitized solar cells

Influence of the Nature of A Cation on Dynamics of Charge Transfer Processes in Perovskite Solar Cells