Publications by Masaud Hassan S Almalki

Aryl-Acetylene Layered Hybrid Perovskites in Photovoltaics

Christophe Ballif, Aïcha Hessler-Wyser, Michael Graetzel, Ursula Röthlisberger, Mostafa Rabie Shlaly Bahr Othman, Masaud Hassan S Almalki, Fatemeh Ansari, Felix Thomas Eickemeyer, Lukas Pfeifer, Christian Michael Wolff, Nikolaos Lempesis, Virginia Carnevali

Metal halide perovskites have shown exceptional potential in converting solar energy to electric power in photovoltaics, yet their application is hampered by limited operational stability. This stimulated the development of hybrid layered (two-dimensional, ...

WILEY-V C H VERLAG GMBH2025

Aryl‐Acetylen‐Schichthybrid‐Perowskite in der Photovoltaik

Michael Graetzel, Ursula Röthlisberger, Masaud Hassan S Almalki, Fatemeh Ansari, Felix Thomas Eickemeyer, Lukas Pfeifer, Nikolaos Lempesis, Virginia Carnevali

Metallhalogenid‐Perowskite haben ein außerordentliches Potenzial für die Umwandlung von Sonnenenergie in elektrische Energie in der Photovoltaik gezeigt, doch ihre Anwendung wird durch eine begrenzte Betriebsstabilität behindert. Dies hat die Entwicklung h ...

Wiley2025

On the Accessibility of Higher-n Phases in Formamidinium-based Ruddlesden-popper and Dion-jacobson Layered Hybrid Perovskites

Michael Graetzel, Ursula Röthlisberger, Pascal Alexander Schouwink, Masaud Hassan S Almalki, Nikolaos Lempesis, Virginia Carnevali, Lorenzo Agosta

Layered (2D) hybrid perovskites offer a promising alternative for stabilizing halide perovskite materials, with a growing interest in formamidinium (FA(+)) lead iodide derivatives for photovoltaics due to their exceptional optoelectronic properties. While ...

WILEY2025

Enhanced performance of perovskite solar cell via up-conversion YLiF4:Yb, Er nanoparticles

Mounir Driss Mensi, Anwar Qasem M Alanazi, Masaud Hassan S Almalki

We report a simple and effective method for producing lanthanide ion-doped lithium-fluoride-based nanocrystals (YLiF4). We utilized those nanoparticles for up-conversion in fabricated perovskite solar cells. The obtained results shows that the up-conversio ...

Elsevier2024

Stabilization of highly efficient perovskite solar cells with a tailored supramolecular interface

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Masaud Hassan S Almalki, Aditya Mishra, Felix Thomas Eickemeyer, Michael Allan Hope, Anurag Krishna, Zhiwen Zhou, Chenxu Zhao

The presence of defects at the interface between the perovskite film and the carrier transport layer poses significant challenges to the performance and stability of perovskite solar cells (PSCs). Addressing this issue, we introduce a dual host-guest (DHG) ...

Nature Research2024

Supramolecular Modulation for Hybrid Perovskite Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jovana Milic, Masaud Hassan S Almalki, Felix Thomas Eickemeyer, Hong Zhang

Hybrid perovskites are emerging as top contenders in the next generation of photovoltaics, yet their stability under operational conditions remains a significant challenge. Specifically, degradation occurs at the interface with charge transport layers in p ...

2024

Improving the operational stability of perovskite solar cells with cesium-doped graphene oxide interlayer

Michael Graetzel, Shaik Mohammed Zakeeruddin, Rita Therisod, Mostafa Rabie Shlaly Bahr Othman, Masaud Hassan S Almalki, Felix Thomas Eickemeyer, Hong Zhang, Lukas Pfeifer, Christian Michael Wolff

Perovskite solar cells (PSCs) have made great advances in terms of power conversion efficiency (PCE), yet their subpar stability continues to hinder their commercialization. The interface between the perovskite layer and the charge-carrier transporting lay ...

Elsevier2024

The Impact of Spacer Size on Charge Transfer Excitons in Dion–Jacobson and Ruddlesden–Popper Layered Hybrid Perovskites

Michael Graetzel, Jacques-Edouard Moser, Aaron Tomas Terpstra, Loï Charles Carbone, Jovana Milic, George Cameron Fish, Masaud Hassan S Almalki, Algirdas Ducinskas, Lukas Pfeifer

Organic materials can tune the optical properties in layered (2D) hybrid perovskites, although their impact on photophysics is often overlooked. Here, we use transient absorption spectroscopy to probe the Dion−Jacobson (DJ) and Ruddlesden−Popper (RP) 2D pe ...

2023

Dataset of "The Impact of Spacer Size on Charge Transfer Excitons in Dion-Jacobson and Ruddlesden-Popper Layered Hybrid Perovskites"

Michael Graetzel, Jacques-Edouard Moser, Aaron Tomas Terpstra, George Cameron Fish, Masaud Hassan S Almalki, Lukas Pfeifer

This dataset underpins the following article published in the Journal of Physical Chemistry Letters: "The Impact of Spacer Size on Charge Transfer Excitons in Dion-Jacobson and Ruddlesden-Popper Layered Hybrid Perovskites" DOI: 10.1021/acs.jpclett.3c01125 ...

Zenodo2023

Stabilization of FAPbI(3) with Multifunctional Alkali-Functionalized Polymer

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jing Gao, Masaud Hassan S Almalki, Felix Thomas Eickemeyer, Hong Zhang, Anurag Krishna

The defects located at the interfaces and grain boundaries (GBs) of perovskite films are detrimental to the photovoltaic performance and stability of perovskite solar cells. Manipulating the perovskite crystallization process and tailoring the interfaces w ...

Wiley-V C H Verlag Gmbh2023

Interface and structural engineering of perovskite solar cells towards enhanced stability and performance

Masaud Hassan S Almalki

Perovskite solar cells have had a meteoric rise in the last decade achieving efficiencies that already rival the most established solar cells technologies. They are easily processed and have excellent optoelectronic properties that make them accessible for ...

EPFL2023

A universal co-solvent dilution strategy enables facile and cost-effective fabrication of perovskite photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Ulf Anders Hagfeldt, Sandy Sanchez Alonso, Narges Yaghoobi Nia, Linfeng Pan, Paramvir Ahlawat, Viacheslav Bolnykh, Dan Ren, Masaud Hassan S Almalki, Hong Zhang, Anurag Krishna, Tzu-Sen Su

Cost management and toxic waste generation are two key issues that must be addressed before the commercialization of perovskite optoelectronic devices. We report a ground-breaking strategy for eco-friendly and cost-effective fabrication of highly efficient ...

Nature Research2022

Dynamic Nuclear Polarization Enables NMR of Surface Passivating Agents on Hybrid Perovskite Thin Films

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Masaud Hassan S Almalki, Aditya Mishra, Michael Allan Hope, Lukas Pfeifer

Surface and bulk molecular modulators are the key to improving the efficiency and stability of hybrid perovskite solar cells. However, due to their low concentration, heterogeneous environments, and low sample mass, it remains challenging to characterize t ...

2022

Nanosegregation in arene-perfluoroarene pi-systems for hybrid layered Dion-Jacobson perovskites

Michael Graetzel, Shaik Mohammed Zakeeruddin, Pascal Alexander Schouwink, Jovana Milic, Masaud Hassan S Almalki, Algirdas Ducinskas, Lukas Pfeifer, Laura Piveteau

Layered hybrid perovskites are based on organic spacers separating hybrid perovskite slabs. We employ arene and perfluoroarene moieties based on 1,4-phenylenedimethylammonium (PDMA) and its perfluorinated analogue (F-PDMA) in the assembly of hybrid layered ...

2022

Naphthalenediimide/Formamidinium-Based Low-Dimensional Perovskites

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Vincent Henri Guillaume Dufoulon, Marko Mladenovic, Dominik Józef Kubicki, David Lyndon Emsley, Farzaneh Jahanbakhshi, Paramvir Ahlawat, Pascal Alexander Schouwink, Jovana Milic, George Cameron Fish, Marco Alejandro Ruiz Preciado, Masaud Hassan S Almalki, Aditya Mishra, Thomas Schneeberger

Low-dimensional hybrid perovskites have emerged as promising materials for optoelectronic applications. Although these materials have already demonstrated enhanced stability as compared to their three-dimensional perovskite analogues, their functionality h ...

2021

Benzylammonium‐Mediated Formamidinium Lead Iodide Perovskite Phase Stabilization for Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Dominik Józef Kubicki, David Lyndon Emsley, Zaiwei Wang, Anwar Qasem M Alanazi, Jovana Milic, Dan Ren, Masaud Hassan S Almalki, Aditya Mishra, Felix Thomas Eickemeyer, Hong Zhang

There is an ongoing surge of interest in the use of formamidinium (FA) lead iodide perovskites in photovoltaics due to their exceptional optoelectronic properties. However, thermodynamic instability of the desired cubic perovskite (α-FAPbI3) phase at ambie ...

2021

Formation of High-Performance Multi-Cation Halide Perovskites Photovoltaics by delta-CsPbI3/delta-RbPbI3 Seed-Assisted Heterogeneous Nucleation

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mounir Driss Mensi, Ulf Anders Hagfeldt, Thomas Paul Baumeler, Linfeng Pan, Essa Awadh R Alharbi, Zaiwei Wang, Masaud Hassan S Almalki, Bowen Yang, Felix Thomas Eickemeyer, Anurag Krishna, Olivier Ouellette

The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling the growth mechanism of perovskite crystals is a promising way towards increasing their efficiency and stability. Herein, a multi-cation halide compo ...

2021