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Propriétés optiques des pérovskites hybrides 3D pour le photovoltaique

Abstract : In the last five years, hybrid organic-inorganic perovskites have emerged as a novel class of semiconductors owing to their interesting electronic and optical properties for photovoltaic and light-emitting devices. This thesis reports an experimental study using optical spectroscopy to explore the optical properties and excitonic effects of hybrid perovskites such as CH3NH3PbX3 with X = I or Br.We studied the optical properties of spin-coated thin films and solution processed single crystals. Thin films present a granular structure and a high density of defects which induce a great variability of the optical properties. The study of single crystals allows us to highlight the intrinsic properties of material: free exciton emission, electron-phonon coupling and charge carriers recombination dynamics. Besides, we have investigated the impact of the orthorhombic-tetragonal phase transition on the optical properties of CH3NH3PbI3. Finally, we have quantified the effect of reabsorption on the emission properties of hybrid perovskites. The accurate estimate of this effect is particularly important for the interpretation of the optical properties of hybrid perovskites and explains the great heterogeneity of the results in the literature.
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Submitted on : Wednesday, February 14, 2018 - 11:08:06 AM
Last modification on : Wednesday, October 14, 2020 - 3:39:54 AM
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  • HAL Id : tel-01708869, version 1

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Hiba Diab. Propriétés optiques des pérovskites hybrides 3D pour le photovoltaique. Optique [physics.optics]. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLN061⟩. ⟨tel-01708869⟩

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