N
Negar Ashari-Astani
Researcher at École Polytechnique Fédérale de Lausanne
Publications - 6
Citations - 5195
Negar Ashari-Astani is an academic researcher from École Polytechnique Fédérale de Lausanne. The author has contributed to research in topics: Perovskite (structure) & Band gap. The author has an hindex of 6, co-authored 6 publications receiving 4559 citations. Previous affiliations of Negar Ashari-Astani include Sharif University of Technology.
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Journal ArticleDOI
Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers
Simon Mathew,Aswani Yella,Peng Gao,Robin Humphry-Baker,Basile F. E. Curchod,Negar Ashari-Astani,Ivano Tavernelli,Ursula Rothlisberger,Md. K. Nazeeruddin,Michael Grätzel +9 more
TL;DR: A molecularly engineered porphyrin dye is reported, coded SM315, which features the prototypical structure of a donor-π-bridge-acceptor and both maximizes electrolyte compatibility and improves light-harvesting properties.
Journal ArticleDOI
Entropic stabilization of mixed A-cation ABX3 metal halide perovskites for high performance perovskite solar cells
Chenyi Yi,Jingshan Luo,Simone Meloni,Ariadni Boziki,Negar Ashari-Astani,Carole Grätzel,Shaik M. Zakeeruddin,Ursula Rothlisberger,Michael Grätzel +8 more
TL;DR: In this paper, the optoelectronic properties of mixed A-cation perovskites and the underlying reasons for their excellent performance and high stability were analyzed using first principle computations.
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Valence and conduction band tuning in halide perovskites for solar cell applications
TL;DR: In this paper, density functional calculations aimed at identifying the atomistic and electronic structure origin of the valence and conduction band, and band gap tunability of halide perovskites ABX3 upon variations of the monovalent and bivalent cations A and B and the halide anion X were performed.
Journal ArticleDOI
Computational Characterization of the Dependence of Halide Perovskite Effective Masses on Chemical Composition and Structure
Negar Ashari-Astani,Simone Meloni,Amir Hesam Salavati,Giulia Palermo,Michael Grätzel,Ursula Rothlisberger +5 more
TL;DR: In this paper, effective masses for a large variety of perovskites of the form ABX3 differing in chemical composition (A= Na, Li, Cs; B = Pb, Sn; X= Cl, Br, I) and crystal structure were calculated.
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Ruddlesden–Popper Phases of Methylammonium-Based Two-Dimensional Perovskites with 5-Ammonium Valeric Acid AVA2MAn–1PbnI3n+1 with n = 1, 2, and 3
Negar Ashari-Astani,Negar Ashari-Astani,Farzaneh Jahanbakhshi,Marko Mladenović,Marko Mladenović,Anwar Q. Alanazi,Iman Ahmadabadi,Mohammad Reza Ejtehadi,M. Ibrahim Dar,Michael Grätzel,Ursula Rothlisberger +10 more
TL;DR: This work provides density functional theory-based structural models for the Ruddlesden-Popper (RP) phases of AVA2(CH3NH3) n-1Pb nI3 n+1 for n = 1, 2, and 3 and validate with experimental data on polycrystalline samples.