Mohammad Ibrahim Dar

Cette personne n’est plus à l’EPFL

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Publications associées (65)

Halide Versus Nonhalide Salts: The Effects of Guanidinium Salts on the Structural, Morphological, and Photovoltaic Performances of Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Simone Meloni, Neha Arora

The impacts of halide and nonhalide sources of guanidinium cations, including guanidinium chloride (GCl) ((NH2)(3)CCl) and guanidinium thiocyanate (GTC) ((NH2)(3)CSCN), are comparatively analyzed on the structural, morphological, and photophysical properti ...

WILEY-V C H VERLAG GMBH2019

Supramolecular Engineering for Formamidinium-Based Layered 2D Perovskite Solar Cells: Structural Complexity and Dynamics Revealed by Solid-State NMR Spectroscopy

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Jovana Milic, Mohammad Ibrahim Dar, Dominik Józef Kubicki, Jiyoun Seo, Yang Li, Amita Ummadisingu, Jeong-Hyeok Im

Perovskite solar cells are one of the most promising photovoltaic technologies, although their molecular level design and stability toward environmental factors remain a challenge. Layered 2D Ruddlesden-Popper perovskite phases feature an organic spacer bi ...

WILEY-V C H VERLAG GMBH2019

Thermodynamically stabilized beta-CsPbI3-based perovskite solar cells with efficiencies > 18%

Michael Graetzel, Mohammad Ibrahim Dar, Yang Li, Xiaoyan Wang, Ying Yang, Xingyu Gao

Although beta-CsPbI3 has a bandgap favorable for application in tandem solar cells, depositing and stabilizing beta-CsPbI3 experimentally has remained a challenge. We obtained highly crystalline beta-CsPbI3 films with an extended spectral response and enha ...

American Association for the Advancement of Science2019

Electrochemical Characterization of CuSCN Hole-Extracting Thin Films for Perovskite Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ladislav Kavan, Mohammad Ibrahim Dar, Neha Arora

CuSCN thin films (optimized previously for perovskite photovoltaics) are deposited on glass, F:SnO2 (FTO), Au, glass-like carbon (GC), and reduced graphene oxide (rGO). They exhibit capacitive charging in an electrochemical window from ca. -0.3 to 0.2 V vs ...

AMER CHEMICAL SOC2019

Hydrothermally processed CuCrO2 nanoparticles as an inorganic hole transporting material for low-cost perovskite solar cells with superior stability

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Yuhang Liu, Seckin Akin

Despite the impressive photovoltaic performances of perovskite solar cells (PSCs) with a power conversion efficiency (PCE) beyond 22%, intensive studies are still required to overcome ongoing issues such as cost, stability, and hysteresis. Here, for the fi ...

Royal Society of Chemistry2018

Reduced Graphene Oxide as a Stabilizing Agent in Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jovana Milic, Mohammad Ibrahim Dar, Neha Arora

One of the most challenging obstacles to commercialization of perovskite solar cells (PSCs) is their instability toward environmental conditions. An emerging solution to overcome these challenges relies on graphene-based composites, in particular, solution ...

WILEY2018

Dedoping of Lead Halide Perovskites Incorporating Monovalent Cations

Mohammad Ibrahim Dar, Mojtaba Abdi Jalebi

2018

Influence of the Nature of A Cation on Dynamics of Charge Transfer Processes in Perovskite Solar Cells

Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Neha Arora, Pankaj Kumar Yadav

2018

High Open Circuit Voltage for Perovskite Solar Cells with S,Si-Heteropentacene-Based Hole Conductors

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Amaresh Mishra, Neha Arora

High photovoltage in perovskite solar cells (PSCs) can be achieved by designing new hole transporting materials (HTMs) with relatively deeper energy levels of the highest occupied molecular orbital (HOMO). Here, we report on the synthesis of a new heteroac ...

WILEY-V C H VERLAG GMBH2018

Insights about the Absence of Rb Cation from the 3D Perovskite Lattice: Effect on the Structural, Morphological, and Photophysical Properties and Photovoltaic Performance

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Gwénolé Jean Jacopin, Neha Arora, Ryusuke Uchida, Silvia Binet

Efficiencies >20% are obtained from the perovskite solar cells (PSCs) employing Cs+ and Rb+ based perovskite compositions; therefore, it is important to understand the effect of these inorganic cations specifically Rb+ on the properties of perovskite struc ...

WILEY-V C H VERLAG GMBH2018

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