Publications de Brian Irving Carlsen

Surface Passivation of FAPbI3-Rich Perovskite with Cesium Iodide Outperforms Bulk Incorporation

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jacques-Edouard Moser, Kevin Sivula, Jun Ho Yum, Mounir Driss Mensi, Felix Thomas Eickemeyer, Lukas Pfeifer, Jing Gao, Thomas Paul Baumeler

Metal halide perovskites (MHPs) have shown an incredible increase in efficiency, reaching as high as 25.7%, which now competes with traditional photovoltaic technologies. Herein, we excluded CsX and RbX (X = I–, Br–, Cl–), the most commonly used cations to ...

2023

Coordination Chemistry as a Universal Strategy for a Controlled Perovskite Crystallization

Brian Irving Carlsen

The most efficient and stable perovskite solar cells (PSCs) are made from a complex mixture of precursors. Typically, to then form a thin film, an extreme oversaturation of the perovskite precursor is initiated to trigger nucleation sites, e.g., by vacuum, ...

Wiley-V C H Verlag Gmbh2023

Radical polymeric p-doping and grain modulation for stable, efficient perovskite solar modules

Michael Graetzel, Shaik Mohammed Zakeeruddin, Felix Thomas Eickemeyer, Yuhang Liu, Brian Irving Carlsen

High-quality perovskite light harvesters and robust organic hole extraction layers are essential for achieving high-performing perovskite solar cells (PSCs). We introduce a phosphonic acid???functionalized fullerene derivative in mixed-cation perovskites a ...

American Association for the Advancement of Science2023

High-Work-Function 2D Perovskites as Passivation Agents in Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Farzaneh Fadaei Tirani, Felix Thomas Eickemeyer, Antoine Philippe Van Muyden, Fatemeh Ansari, Ulf Anders Hagfeldt, Hiroyuki Kanda, Brian Irving Carlsen

Various approaches have been employed to passivate the defects in perovskite films used in perovskite solar cells (PSCs). However, the passivation mechanism is often unclear at a molecular level, and the reason for enhanced PSC performance often remains el ...

Amer Chemical Soc2023

Molecularly Engineered Low-Cost Organic Hole-Transporting Materials for Perovskite Solar Cells: The Substituent Effect on Non-fused Three-Dimensional Systems

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nikolaos Vlachopoulos, Ulf Anders Hagfeldt, Bowen Yang, Brian Irving Carlsen, Jiajia Suo

In this work, we describe a new class of non-fused 3D asymmetric compounds (named 1, 2, 3, and 4) as low-cost organic hole-transporting materials (HTMs) for perovskite solar cells (PSCs). The fundamental understanding of the influence of the methylthio and ...

AMER CHEMICAL SOC2022

Luminescent and electronic properties of perovskite solar cells

Brian Irving Carlsen

Perovskite solar cells show great promise to serve as an alternative for traditional silicon-based solar cells, however several problems present obstacles for their commercialization. Standard perovskite cells contain lead, which is toxic to humans and har ...

EPFL2022

Thiocyanate-Mediated Dimensionality Transformation of Low- Dimensional Perovskites for Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jovana Milic, Ulf Anders Hagfeldt, Yuhang Liu, Dan Ren, Zaiwei Wang, Claudia Esther Avalos, Brian Irving Carlsen

Two-dimensional (2D) hybrid perovskite solar cells have induced widespread research interest owing to their higher stability as compared to three-dimensional (3D) analogues. The photovoltaic performance, however, is still limited. Here, we report a perovsk ...

2022

Nanoscale Phase Segregation in Supramolecular π-Templating for Hybrid Perovskite Photovoltaics from NMR Crystallography

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Ursula Röthlisberger, Jovana Milic, Marko Mladenovic, Ulf Anders Hagfeldt, Dominik Józef Kubicki, Yuhang Liu, Michael Allan Hope

The use of layered perovskites is an important strategy to improve the stability of hybrid perovskite materials and their optoelectronic devices. However, tailoring their properties requires accurate structure determination at the atomic scale, which is a ...

2021

Thermodynamic stability screening of IR-photonic processed multication halide perovskite thin films

Michael Graetzel, Shaik Mohammed Zakeeruddin, Pascal Alexander Schouwink, Sandy Sanchez Alonso, Ulf Anders Hagfeldt, Brian Irving Carlsen, Natalie Flores Diaz

We report a material screening study for phase transitions of multication hybrid halide perovskite films. Two hundred sixty-six films processed with flash infrared annealing were optically and structurally characterized. This data was compiled into a datab ...

Royal Society of Chemistry2021

Vapor-assisted deposition of highly efficient, stable black-phase FAPbI(3) perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Ursula Röthlisberger, Wolfgang Richard Tress, Likai Zheng, Felix Thomas Eickemeyer, Ulf Anders Hagfeldt, Yuhang Liu, Zaiwei Wang

Mixtures of cations or halides with FAPbI(3) (where FA is formamidinium) lead to high efficiency in perovskite solar cells (PSCs) but also to blue-shifted absorption and long-term stability issues caused by loss of volatile methylammonium (MA) and phase se ...

American Association for the Advancement of Science2020