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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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All news

News

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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5 February 2021

Alejandro LORENZO RUIZ defends his PhD thesis

« Nonlinear integrated photonic devices based on gallium phosphide », Friday 5th of february 2021, 9:15 am, INSA Rennes (...)

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Focus on

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. (...)

Jacky EVEN selected by Clarivates Analytics as one of the "Highly Cited Researchers 2021 »

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

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 (...)

Semiconductor physics of organic–inorganic 2D halide perovskites

(Nature Nanotechnology 2020) In this Review, we discuss the current understanding in the structure and physical properties of 2DPKs from the monolayers to assemblies, and present a comprehensive comparison with conventional semiconductors. (...)

The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals

Perovskite quantum dots (QDs) are promising nanostructures for optoelectronics, especially for (...)

H2020 Grant for perovskite-based lighting, wearables and fabric devices with LiFi and photovoltaic capability has been approved and started April 1st 2020

The EU H2020-funded project PeroCUBE aims at developing flexible, lightweight perovskite-based (...)