Publications de Sadig Aghazada

Ionic dipolar switching hinders charge collection in perovskite solar cells with normal and inverted hysteresis

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Tom Theodorus Antonius Lummen, Kyung Taek Cho, Iwan Zimmermann

Drift-diffusion modeling of the ionic dipole switching from the measurement of fast scanned and long pre-biased electrical response is proposed as a novel protocol for evaluation of limit hysteretic effects in perovskite solar cells. Up to eight systems we ...

2019

Lead and HTM Free Stable Two-Dimensional Tin Perovskites with Suitable Band Gap for Solar Cell Applications

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Tom Theodorus Antonius Lummen, Iwan Zimmermann

Organic-inorganic hybrid perovskites have attracted great attention over the last few years as potential light-harvesting materials for efficient and cost-effective solar cells. However, the use of lead iodide in state-of-the-art perovskite devices may dem ...

Wiley-VCH Verlag GmbH2019

Cyclometalated Ruthenium Complexes for Dye-Sensitized Solar Cells

Sadig Aghazada

The transition towards carbon-free sources of energy is vital for humankind. This process is feasible through the extensive use of photovoltaic technologies, which may convert solar energy into elec-trical and chemical energy. In the last half-century, man ...

EPFL2018

Bis-Tridentate-Cyclometalated Ruthenium Complexes with Extended Anchoring Ligand and Their Performance in Dye-Sensitized Solar Cells

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Peng Wang, Iwan Zimmermann, Yameng Ren

2018

Discerning recombination mechanisms and ideality factors through impedance analysis of high-efficiency perovskite solar cells

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Kyung Taek Cho, Iwan Zimmermann

Elsevier2018

Bis(arylimidazole) Iridium Picolinate Emitters and Preferential Dipole Orientation in Films

Mohammad Khaja Nazeeruddin, Natalia Gasilova, Sadig Aghazada, Iwan Zimmermann, Aron Joel Huckaba, Pascal Alexander Schouwink

2018

Ruthenium Complexes as Sensitizers in Dye-Sensitized Solar Cells

Mohammad Khaja Nazeeruddin, Sadig Aghazada

2018

Dye-sensitized solar cells using cobalt electrolytes: the influence of porosity and pore size to achieve high-efficiency

Pascal Comte, Mohammad Khaja Nazeeruddin, Aswani Yella, Simon Mathew, Sadig Aghazada

Diffusion impediments in redox shuttles are a major limitation to realizing high power conversion efficiencies (PCEs) in dye sensitized solar cells (DSCs) using cobalt complexes. Mass transport limitations are strongly dependent on the pore size and the po ...

Royal Society of Chemistry2017

Exploration of bis(arylimidazole) Iridium picolinate complexes

Mohammad Khaja Nazeeruddin, Natalia Gasilova, Sadig Aghazada, Iwan Zimmermann, Aron Joel Huckaba, Giulia Grancini

2017

Effect of Donor Groups on the Performance of Cyclometalated Ruthenium Sensitizers in Dye-Sensitized Solar Cells

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Peng Wang, Yameng Ren

Three new tris-heteroleptic complexes of ruthenium(II) were designed by coordinating the metal center with cyclometalating, anchoring, and auxiliary ligands with different donor substituents. N-Hexylcarbazole, N-hexylphenothiazine, and N-hexyldiphenylamine ...

American Chemical Society2017

Synthesis and Photophysical Characterization of Cyclometalated Ruthenium Complexes with N-Heterocyclic Carbene Ligands

Mohammad Khaja Nazeeruddin, Sadig Aghazada, Valeriu Scutelnic, Iwan Zimmermann

In the search of new ligand environment for the ruthenium(II) complexes with pyridine-type ligands, we developed seven new cyclometalated ruthenium complexes with N-heterocyclic carbenes (NHCs). In a two-step procedure, we synthesized complexes with the ge ...

American Chemical Society2017

High Open-Circuit Voltage: Fabrication of Formamidinium Lead Bromide Perovskite Solar Cells Using Fluorene-Dithiophene Derivatives as Hole-Transporting Materials

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Gratia, Gwénolé Jean Jacopin, Mohammad Ibrahim Dar, Sadig Aghazada, Neha Arora, Filippo de Angelis

Four different fluorene dithiophene derivative-based hole-transporting materials (HTMs) (SO7-10) have been synthesized via a facile route and were successfully used in the fabrication of formamidinium lead bromide perovskite solar cells. Detailed character ...

Amer Chemical Soc2016

A molecularly engineered hole-transporting material for efficient perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Ulf Anders Hagfeldt, Peng Gao, Sadig Aghazada, Juan-Pablo Correa-Baena, Antonio Abate, Taisuke Matsui, Michael Saliba, Filippo de Angelis

Soln.-processable perovskite solar cells have recently achieved certified power conversion efficiencies of over 20%, challenging the long-standing perception that high efficiencies must come at high costs. One major bottleneck for increasing the efficie ...

Nature Publishing Group2016

Benzotrithiophene-Based Hole-Transporting Materials for 18.2% Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Gratia, Sadig Aghazada, Cristina Roldán Carmona, Iwan Zimmermann, Inés Garcia Benito

New star-shaped benzotrithiophene (BTT)-based hole-transporting materials (HTM) BTT-1, BTT-2 and BTT-3 have been obtained through a facile synthetic route by crosslinking triarylamine-based donor groups with a benzotrithiophene (BTT) core. The BTT HTMs wer ...

Wiley-VCH Verlag GmbH2016

Unraveling the Dual Character of Sulfur Atoms on Sensitizers in Dye-Sensitized Solar Cells

Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Joël Teuscher, Thomas Moehl, Aswani Yella, Peng Gao, Sadig Aghazada

Cyclometalated ruthenium sensitizers have been synthesized that differ with number of thiophene units on the auxiliary ligands. Sensitizers possessing four (SA25, SA246, and SA285) or none (SA282) sulfur atoms in their structures, were tested in solar cell ...

Amer Chemical Soc2016

Molecular Engineering of Functional Materials for Energy and Opto-Electronic Applications

Mohammad Khaja Nazeeruddin, Peng Gao, Sadig Aghazada

This review presents an overview of the dedicated research directions of the Group for Molecular Engineering of Functional Materials (GMF). This includes molecular engineering aspects of sensitizers constructed from ruthenium complexes, organic molecules, ...

Swiss Chemical Soc2015