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Theses

Lasers à pérovskites hybrides halogénées en microcavité

Abstract : Since 2012, the hybrid halide perovskites of CH3NH3PbX3 (X = I, Br or Cl) type have emerged as very promising not only in the field of photovoltaics but also for light-emitting devices such as light-emitting diodes and lasers. One of the crucial advantages of these semiconductor materials is their low temperature and solution deposition method. The tuning of the perovskites emission wavelength throughout the visible spectrum by simple chemistry substitutions in the halogenated part is another asset. In particular, the halide perovskites show a high luminescence efficiency in the green and could address the "green gap" problem in laser sources (the "green gap" refers to the drop in efficiency of light-emitting diodes and laser diodes emitting in the green).The thesis work carried out here is focused on the development of an optically pumped laser based on the hybrid halide perovskite CH3NH3PbBr3 emitting in the green. The structure consists of a vertical microcavity based on a 100-nanometre thin film of CH3NH3PbBr3 deposited by spin-coating, inserted between a dielectric mirror and a metal mirror. We have demonstrated, at room temperature, the strong coupling regime between the microcavity photonic mode and the exciton of the perovskite. This strong coupling regime leads to the creation of quasi-particles called exciton-polaritons, which are a coherent superposition of photonic and excitonic states. By increasing the optically injected power, we obtained a laser effect in this microcavity. The study of the emission properties of this laser shows that we have produced a random laser, emitting in the green, filtered directionally by the dispersion curve of the lower polariton. This filtering by the polariton dispersion curve allows the directionality of the laser emission to be controlled over a wide range of angles: angles as large as 22° were obtained experimentally.
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Paul Bouteyre. Lasers à pérovskites hybrides halogénées en microcavité. Optique [physics.optics]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLN069⟩. ⟨tel-02460292⟩

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