Publications de Ahmad Ajdar Zadeh Oskouei

Dataset of "Hot Carrier Mobility Dynamics Unravel Competing Subpicosecond Processes in Lead Halide Perovskites"

Jacques-Edouard Moser, Ahmad Ajdar Zadeh Oskouei, Arun Aby Paraecattil, Aurélien René Willauer, Andrés Burgos Caminal, Juan Manuel Moreno Naranjo

Dataset underpinning the published article: A. Burgos-Caminal; J. M. Moreno-Naranjo; A. R. Willauer; A. A. Paraecattil; A. Ajdarzadeh and J.-E. Moser. Hot Carrier Mobility Dynamics Unravel Competing Subpicosecond Processes in Lead Halide Perovskites. J. Ph ...

2021

Hot Carrier Mobility Dynamics Unravel Competing Subpicosecond Processes in Lead Halide Perovskites

Jacques-Edouard Moser, Ahmad Ajdar Zadeh Oskouei, Arun Aby Paraecattil, Aurélien René Willauer, Andrés Burgos Caminal, Juan Manuel Moreno Naranjo

The mechanisms behind the large photocarrier diffusion length and the outstanding photovoltaic performances of lead halide perovskites (LHP) are still debated. Hot carrier cooling and the formation of polarons are central to the charge separation process. ...

2021

Dynamics of Interfacial Charge Transfer States and Carriers Separation in Dye-Sensitized Solar Cells: A Time-Resolved Terahertz Spectroscopy Study

Jacques-Edouard Moser, Jan Cornelius Brauer, Arianna Marchioro, Ahmad Ajdar Zadeh Oskouei, Arun Aby Paraecattil

Electron injection from a photoexcited molecular sensitizer into a wide-bandgap semiconductor is the primary step toward charge separation in dye-sensitized solar cells (DSSCs). According to the current understanding of DSSCs functioning mechanism, charges ...

American Chemical Society2015

Ultraviolet transient absorption, transient grating and photon echo studies of aqueous tryptophan

Majed Chergui, Olivier Christian Bräm, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei, Cristina Consani

We compare UV transient grating (TG) experiments of aqueous tryptophan with transient absorption (TA) and fluorescence up-conversion measurements. The TG and TA signals show a bi-exponential rise with sub-ps and ps time constants, which are consistent with ...

Elsevier2013

Development of Ultraviolet Photon Echo Experiments for the Study of Molecular Dynamics in Solution

Ahmad Ajdar Zadeh Oskouei

This thesis work concerns the development and applications of ultrafast optical techniques and in particular photon echo in the UV range (< 300 nm). Development of these techniques in the UV range is important for studying molecular dynamics in solution, s ...

EPFL2011

Ultrafast (Bio)physical and (Bio)chemical Dynamics

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Amal El Nahhas, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei, Renske Marjan van der Veen, Cristina Consani, Gerald Auböck

We give an overview of our recent work on ultrafast dynamics of chemical (organic dyes, metal-complexes, colloidal quantum dots), and biological (retinal and haem proteins) systems in the liquid phase, studied with a variety of ultrafast optical techniques ...

2011

Broadband femtosecond fluorescence up-conversion and photon echo experiments in the UV

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei

The fs-time-resolved study of a small UV dye in different solvents with fluorescence up-conversion and photon-echo techniques in the UV range provides new insight in cooling relaxation and solvation dynamics of non-polar molecules in polar solvents. ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2009

Photon echo peak shift experiments in the UV: p-terphenyl in different solvents

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei

We present a new photon echo set-up operating in the UV range and our 1st results of photon echo peak shift (PEPS) expts. of a small non-polar dye mol., p-terphenyl (pTP), in 3 different solvents: EtOH, MeOH, and 2-propanol. The expts. show the feasibility ...

2008

A semiclassical approach for electro-optic effect

Ahmad Ajdar Zadeh Oskouei

In this article, we present a semiclassical approach for modeling of electro-optic (EO) effect. We calculate phase retardation between x and y polarizations of optical electric field when a transverse external electric field is applied. Our results are wel ...

2008

Ultrafast UV photon echo peak shift and fluorescence up conversion studies of non-polar solvation dynamics

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei

The authors present photon echo peak shift and femtosecond fluorescence up-conversion studies of nonpolar solvation dynamics of a simple nonpolar dye p-terphenyl in EtOH and cyclohexane, using excitation in the UV range at 290 nm. The UV fluorescence up-co ...

2008

Femtosecond fluorescence upconversion setup with broadband detection in the ultraviolet

Majed Chergui, Olivier Christian Bräm, Frank van Mourik, Goran Zgrablic, Andrea Cannizzo, Ahmad Ajdar Zadeh Oskouei

We show a femtosecond fluorescence upconversion setup with broadband detection to measure time-resolved emission spectra in the 300-550 nm range, upon excitation between 250 and 300 nm, with a time resolution of 100 fs. We present time-resolved fluorescenc ...

2007

Simulation and estimation of normal dispersion phenomenon in an acentric organic crystal (NPP) by the quantum photonic approach

Ahmad Ajdar Zadeh Oskouei

In this paper, we present a nano-quantum photonic approach for the calculation of normal dispersion phenomena in organic crystals such as N-(4-nitrophenyl)-L-prolinol(NPP). We assume that a laser beam consists of a flow of energetic particles that interact ...

2007