Publications de Anwar Qasem M Alanazi

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

Interfacial Modulation through Mixed-Dimensional Heterostructures for Efficient and Hole Conductor-Free Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Anwar Qasem M Alanazi, Jovana Milic, Felix Thomas Eickemeyer, Hong Zhang, Laura Piveteau

Perovskite solar cells have led the new surge of solar energy research. However, their instability is a pressing issue mostly attributed to the perovskite interface with charge-selective transport layers. In this work, diethylammonium iodide (DEAI) surface ...

Wiley-V C H Verlag Gmbh2023

Efficient and Stable Large Bandgap MAPbBr(3) Perovskite Solar Cell Attaining an Open Circuit Voltage of 1.65 V

Michael Graetzel, Shaik Mohammed Zakeeruddin, Thomas Paul Baumeler, David Lyndon Emsley, Linfeng Pan, Anwar Qasem M Alanazi, Yuhang Liu, Jing Gao, Felix Thomas Eickemeyer, Hongwei Zhu, Michael Allan Hope, Olivier Ouellette

We report on the preparation of MAPbBr(3) perovskite films of high electronic quality by applying a methylamine (MA) vapor treatment and mitigating surface defects using the amphiphilic molecular passivator, neopentylammonium chloride (NPACl). We find that ...

2022

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

Compositional Engineering of Perovskite Light Absorbers for Enhanced Stability and Performance through 2D/3D Interfacing

Anwar Qasem M Alanazi

The semiconducting hybrid-organic inorganic halide perovskites have excellent optical and electronic properties that attract the interest of scientists and researchers. Perovskite solar cells have seen the most rising-rate in the chart of solar cell effici ...

EPFL2021

Optical and structure properties of CH3NH3PbI3 perovskite films doped with Cesium

Anwar Qasem M Alanazi

Methylammonium lead iodide doped with cesium (MA(1-x)Cs(x)PbI(3), x = 0, 0.03, 0.05, 0.1) thin films were prepared with and without chlorobenzene (CB). X-ray diffraction analysis applying the Rietveld refinement method is carried out, and the effect of Cs ...

2021

Charge Accumulation, Recombination, and Their Associated Time Scale in Efficient (GUA)(x)(MA)(1-x)PbI3-Based Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Pankaj Kumar Yadav, Daniel Prochowicz, Anwar Qasem M Alanazi, Mohammad Mahdi Tavakoli

Here, we study the influence of guanidinium (GUA) ions on the open-circuit voltage (V-oc) in the (GUA)(x)(MA)(1-x)PbI3 based perovskite solar cells. We demonstrate that incorporation of GUA forms electronic and ionic accumulation regions at the interface o ...

2019

Atomic-Level Microstructure of Efficient Formamidinium-Based Perovskite Solar Cells Stabilized by 5-Ammonium Valeric Acid Iodide Revealed by Multinuclear and Two-Dimensional Solid-State NMR

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Marine Eva Fedora Bouduban, Marko Mladenovic, Fabrizio Giordano, Dominik Józef Kubicki, David Lyndon Emsley, Farzaneh Jahanbakhshi, Essa Awadh R Alharbi, Daniel Prochowicz, Anwar Qasem M Alanazi, Jovana Milic, Dan Ren

Chemical doping of inorganic–organic hybrid perovskites is an effective way of improving the performance and operational stability of perovskite solar cells (PSCs). Here we use 5-ammonium valeric acid iodide (AVAI) to chemically stabilize the structure of ...

2019

Atomic-level passivation mechanism of ammonium salts enabling highly efficient perovskite solar cells

Michael Graetzel, Jacques-Edouard Moser, Shaik Mohammed Zakeeruddin, Fabrizio Giordano, Dominik Józef Kubicki, Jingshan Luo, Andrés Burgos Caminal, David Lyndon Emsley, Brennan James Walder, Essa Awadh R Alharbi, Anwar Qasem M Alanazi, Alexander Roland Uhl

The high conversion efficiency has made metal halide perovskite solar cells a real break-through in thin film photovoltaic technology in recent years. Here, we introduce a straight-forward strategy to reduce the level of electronic defects present at the i ...

Nature Research2019

Ruddlesden–Popper Phases of Methylammonium-Based Two-Dimensional Perovskites with 5-Ammonium Valeric Acid AVA2MAn–1PbnI3n+1 with n = 1, 2, and 3

Michael Graetzel, Ursula Röthlisberger, Negar Ashari Astani, Mohammad Ibrahim Dar, Marko Mladenovic, Farzaneh Jahanbakhshi, Anwar Qasem M Alanazi

2019

Engineering of Perovskite Materials Based on Formamidinium and Cesium Hybridization for High-Efficiency Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Dominik Józef Kubicki, Pankaj Kumar Yadav, Daniel Prochowicz, Anwar Qasem M Alanazi, Mohammad Mahdi Tavakoli, Rashmi Runjhun

Engineering the chemical composition of inorganic-organic hybrid perovskite materials is an effective strategy to boost the performance and operational stability of perovskite solar cells (PSCs). Among the diverse family of ABX(3) perovskites, methylammoni ...

AMER CHEMICAL SOC2019