Perovskites hybrides

The Project Group “Perovskite” aims at developing novel perovskite optoelectronic devices in which light-matter interaction mechanisms are engineered in the subwavelength scale. This is achieved by patterning the perovskite material into metasurface structures. Functionalities and physical properties of perovskite devices will be implemented/enhanced by exploring innovative photonics concepts such as photon management, exciton-photon strong coupling regime, dispersion engineering.

Context and Approach

Starting with the “perovskite fever” in 2013 in the field of photovoltaics, hybrid organic-inorganic perovskite materials have now become a key player in applications for optoelectronics, including solar cell, light emitting diode, laser and sensing. The Project Group “Perovskite” aims at developing novel perovskite optoelectronic devices in which light-matter interaction mechanisms are engineered in the subwavelength scale. This is achieved by patterning the perovskite material into metasurface structures. Functionalities and physical properties of perovskite devices will be implemented/enhanced by exploring innovative photonics concepts such as photon management, dispersion engineering, polaritonic physics at room temperature.

Research topics

Nanophotonic concepts for perovskite solarcells

Perovskite has now become an alternative solution for silicon technology in the field of photovoltaics. Our distinctive approach is to implement nanophotonic concepts for boosting perovskite solar cell performance, while keeping its low-cost and solution-based fabrication process (see Fig.1). Different photon management strategies (light-trapping, photon recycling, up-conversion) are combined to enhance energy conversion efficiency of single junction perovskite solar cell and tandem perovskite-silicon solar cell.

Nano impression sur perovskite pour application photovoltaïque

Fig.1. (a) Sketch nano-imprint process to pattern perovskite. (b) Scanning Electronic Microscope (SEM) image of perovskite metasurface. (c) SEM image (side view) of perovskite solarcell with patterned perovskite for light-trapping and photon recycling.

Perovskite-based polaritonic devices

Exciton-polaritons are quasiparticles arising from the strong coupling regime between excitons in semiconductor and photons of resonant cavity. Polaritonic devices, inherited the best features of excitonic and photonic components, is a prominent platform to study fundamental physics of interacting bosons, as well as novel all-optical devices. Our original approach is to elaborate polaritons at room temperature by coupling perovskite excitons and Bloch photons of perovskite periodical metasurface (see Fig.2.a). Polaritonic properties (effective mass, group velocity, density of states …) are tailored on-demand via energy-momentum dispersion engineering (Fig.2.b,c).

Métasurface excitonique à base de pérovskite

Fig.2. (a) Perovskite-based excitonic metasurface of subwavelength pillar lattice. (b) Angle-resolved reflectivity (left panel) and photoluminescence (right panel) of perovskite metasurface. Different polaritonic modes are clearly observed. (c) Comparison between experimental and theoretical band diagram of polaritonic modes in perovskite metasurface.

Perovskite-based emitting devices

As direct band-gap semiconductor, perovskite material exhibit remarkable optical properties for emitting devices, such as tunable bandgap across the visible range, high luminescence quantum yield and narrow emission linewidth. In this topic, we study different original mechanisms to control the far-field emission of perovskite-based light emitting diodes and micro-lasers (Figs.3): coupling perovskite quantum dots to photonic exceptional points, filtering perovskite random lasing via vertical cavity, coupling perovskite thin-film to Bloch resonances…

Boite quantique perovskite

Fig.3. Farfield emission of perovskite quantum dots when coupled to photonic exceptional points.

Projects

Group members

  • Coordinator: Hai Son Nguyen
  • Permanent: Christian Seassal, Erwann Fourmond, Emmanuel Drouard, Céline Chevallie
  • PhD :  Florian Berry, Nguyen Ha My Dang, Raphael Mermet Lyaudoz
INL CNRS
Nanoimprint sur couche de perovskite.
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