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27 January 2023

Ultrafast relaxation of lattice distortion in 2D perovskites

The paper describes the first ultrafast direct measurement of structural dynamics and heat release under high excitation in 2D perovskites. These materials are used in highly efficient perovskite (...)

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5 December 2022

the French Physical Society (SFP) Grand Prix has awarded the Jean Ricard Prize 2022 to Jacky EVEN

The jury of the French Physical Society (SFP) Grand Prix has awarded the Jean Ricard Prize 2022 to Jacky EVEN, professor at INSA Rennes, physicist at the UMR Institut FOTON, and senior member of (...)

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26 September 2022

Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells

(Science 2022) Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By solvent fine tuning, we could grow phase-pure two-dimensional (2D) halide perovskite bilayer stacks of the desired composition, thickness, and bandgap onto 3D perovskites without dissolving the underlying substrate. Thickness dependence of the 2D perovskite layer reveals the anticipated trends for n-i-p and p-i-n architectures, which is consistent with band alignment and carrier transport limits for 2D perovskites. We measured a photovoltaic efficiency of 24.5%, with exceptional stability of T99 (time during which the efficiency remains above 99% of its initial value) of >2000 hours, implying that the 3D/2D bilayer inherits the intrinsic durability of 2D perovskite without compromising efficiency.

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9 September 2022

Controlling the nucleation and growth kinetics of lead halide perovskite quantum dots

(Science 2022) Colloidal lead halide perovskite nanocrystals are of interest as photoluminescent quantum dots (QDs) whose properties depend on their size and shape. We report a room-temperature synthesis of monodisperse, isolable, spheroidal APbBr3 QDs (“A” indicates cesium, formamidinium, and methylammonium) that are size tunable from 3 to >13 nanometers. The kinetics of both nucleation and growth are temporally separated and substantially slowed down. QDs of all these compositions exhibit up to four excitonic transitions in their linear absorption spectra, and we demonstrate experimentally and theoretically that the size-dependent confinement energy for all transitions is independent of the A-site cation.

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17 February 2021

Art to show the invisible?

Since September 2020, the Foton Institute has been welcoming two visual artists as part of an Art & Science residency within the laboratory (...)

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3 February 2020

World record for photon capture in micro-resonators

(Physical Review Letters, mar. 2016) The introduction of a slow-light medium in an optical micro-resonator extends the lifetime of a photon circulating in the device by several orders of magnitude.

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15 December 2022

Mekan PIRIYEV defends his PhD thesis

« Development of new materials for solar hydrogen production », Thursday 15 December 2022, 1:00 pm, , INSA Rennes (...)

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16 December 2021

Fabien CASSIO defends his PhD thesis

« Hybrid photonic integrated circuits based on porous silicon and polymers for biosensor applications », Thursday 16th of december 2021, 10:00 am, ENSSAT (...)

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12 July 2021

Nessim JEBALI defends his PhD thesis

« Contribution to the study of the non-linear properties of chalcogenide glass waveguides and micro-resonators », Monday 12th july 2021, 10:00 am, videoconferencing (...)

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15 June 2021

Lipin CHEN defends his PhD thesis

« Optoelectronic, vibrational and transport properties of III-V/Si antiphase boundaries for photonics and solar energy harvesting », Tuesday 15th june 2021, 9:30 am, INSA Rennes (...)

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17 February 2021

Joseph SLIM defends his PhD thesis

« Optical Signal Processing for Space Division Multiplexed Systems », Wednesday 17th of february 2021, 9:00 am, ENSSAT (...)

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Focus on

Many-body Correlations and Exciton Complexes in CsPbBr3 Quantum Dots

By combining cryogenic single-QD photoluminescence spectroscopy with configuration-interaction (...)

Universal scaling laws for charge-carrier interactions with quantum confinement in lead-halide perovskites

We settle the debate on the bright-dark exciton level ordering in these materials. We show (...)

An article awarded by AIChE

Jacky EVEN and his coauthors received the award of the best fundamental contribution for the (...)

Jacky EVEN selected by Clarivates Analytics as one of the "Highly Cited Researchers 2022"

Every year, the Highly Cited Researchers™ list from Clarivate™ identifies scientists and social (...)

International Conference EMLEM 2022 : Best Oral Contribution Award

Marios ZACHARIAS, Post-doctoral researcher of FOTON-OHM (INSA) CNRS laboratory, received the (...)

Unveiling the invisible by photoelectrochemistry

In a recent collaborative work, a team of researchers from ISCR (Rennes), FOTON (Rennes), and (...)

Light-activated interlayer contraction in 2D perovskites for high-efficiency solar cells

(Nature Nanotechnology 2021) In this Review, a high enhancement of photovoltaic efficiency of 2D perovskite solar cells is presented. (...)

Solar hydrogen production achieved with a new class of materials developed in Rennes

(Advanced Science 2021) In the work which has just been published in the prestigious journal “ Advanced Science ”, the Rennes team proposes to use a new family of materials with quite astonishing photoelectric properties to produce solar hydrogen efficiently, at low cost and with a low environmental impact. This proposal is accompanied by several demonstrations of photoelectrodes operating under solar illumination. (...)

Launch of a COST European project

About the European COST action OPERA The European network COST OPERA "European Network for (...)

Highly efficient photoelectric effect in halide perovskites for regenerative electron sources

We report efficient, regenerative and low-cost electron sources based on solution-processed (...)