Publications by Thomas Moehl | EPFL Graph Search

Triarylamine-based hydrido-carboxylate rhenium(i) complexes as photosensitizers for dye-sensitized solar cells

Ulf Anders Hagfeldt, Thomas Moehl, Kazuteru Nonomura, Lorenzo Veronese

Two new dyes based on a dinuclear rhenium complex and (E)-3-(5-(4-(bis(2,4-dibutoxy-[1,1-biphenyl]-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid (namely D35) have been investigated as sensitizers for dye sensitized solar cells (DSSCs). Two different ...

ROYAL SOC CHEMISTRY2019

Photovoltaic and Amplified Spontaneous Emission Studies of High-Quality Formamidinium Lead Bromide Perovskite Films

Mohammad Khaja Nazeeruddin, Neha Arora, Benoît Marie Joseph Deveaud, Wolfgang Richard Tress, Peng Gao, Mohammad Ibrahim Dar, Thomas Moehl, Gwénolé Jean Jacopin, Mahmoud Saeed Qaid Mohammad Hezam

This study demonstrates the formation of extremely smooth and uniform formamidinium lead bromide (CH(NH2)(2)PbBr3 = FAPbBr(3)) films using an optimum mixture of dimethyl sulfoxide and N,N-dimethylformamide solvents. Surface morphology and phase purity of t ...

Wiley-Blackwell2016

Photodetector

Mohammad Khaja Nazeeruddin, Thomas Moehl, Konrad Domanski, Jeong-Hyeok Im

The present invention concerns a device for room temperature reverse-bias operation photo-detection. The device comprising: - a planar first electrode extending in a planar direction; - a second electrode positioned above the first electrode in a direction ...

2016

Influence of the Adsorption of Phycocyanin on the Performance in DSS Cells: and Electrochemical and QCM Evaluation

Michael Graetzel, Jean-David Décoppet, Thomas Moehl

The influence of some coadsorbents and different pH values on the efficiency of DSS cells assembled with phycocyanin was evaluated using quartz crystal microbalance (QCM) and electrochemical techniques as impedance spectroscopy (EIS) and cyclic voltammetry ...

2016

Ionic polarization-induced current–voltage hysteresis in CH3NH3PbX3 perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Wolfgang Richard Tress, Peng Gao, Michael Saliba, Simone Meloni, Thomas Moehl, Yonghui Lee

CH3NH3PbX3 (MAPbX(3)) perovskites have attracted considerable attention as absorber materials for solar light harvesting, reaching solar to power conversion efficiencies above 20%. In spite of the rapid evolution of the efficiencies, the understanding of b ...

Nature Research2016

Covalent Immobilization of a Molecular Catalyst on Cu2O Photocathodes for CO2 Reduction

Michael Graetzel, Peng Gao, Jingshan Luo, Thomas Moehl, Matthew Thomas Mayer, Marcel Roland Schreier

Sunlight-driven CO2 reduction is a promising way to close the anthropogenic carbon cycle. Integrating light harvester and electrocatalyst functions into a single photo electrode, which converts solar energy and CO2 directly into reduced carbon species, is ...

American Chemical Society2016

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

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

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, Wolfgang Richard Tress, Thomas Moehl, Nevena Vaskova Marinova

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

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

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

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

Stable and Efficient Perovskite Solar Cells Based on Titania Nanotube Arrays

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Mohammad Ibrahim Dar, Thomas Moehl, Neha Arora, Peng Qin

Highly ordered 1D TiO2 nanotube arrays are fabricated and applied as nanocontainers and electron transporting material in CH3NH3PbI3 perovskite solar cells. The optimized device shows a power conversion efficiency of 14.8%, and improved stability under an ...

Wiley-V C H Verlag Gmbh2015