Spintronique des excitons dans les conducteurs organiques

par Kamila Yunusova

Projet de thèse en Physique

Sous la direction de Hélène Bouchiat et de Alexei Chepelianskii.

Thèses en préparation à Paris Saclay en cotutelle avec l'Université de Kazan , dans le cadre de Physique en Île de France , en partenariat avec Laboratoire de Physique des Solides (laboratoire) et de université Paris-Sud (établissement de préparation de la thèse) depuis le 01-10-2016 .


  • Résumé

    Harvesting of photo-excitations in organic solar-cells is fundamentally governed by the quantum mechanical property of spin. Indeed, spin determines the generation and recombination pathways for a particular species, which ultimately determines device performance. Crucial to solar cell operation are spin-triplet excitons, which have the potential to overcome conventional efficiency limits through the singlet fission mechanism in which two triplet excitons can be generated from a single singlet exciton. The unique spin signatures of triplet excitons makes them ideally suited for investigations using spin-resonance techniques. We propose to study the interaction between spin dynamics and transport properties using a novel technique where triplet excitons are coupled to a microwave superconducting resonator which can simultaneously probe transport and spin-resonance signals (see sketch below). By performing these measurements at sub-Kelvin temperatures, we aim to unravel the quantum mechanical processes giving rise to singlet fission.

  • Titre traduit

    Spintronics of excited states in organic materials


  • Résumé

    Harvesting of photo-excitations in organic solar-cells is fundamentally governed by the quantum mechanical property of spin. Indeed, spin determines the generation and recombination pathways for a particular species, which ultimately determines device performance. Crucial to solar cell operation are spin-triplet excitons, which have the potential to overcome conventional efficiency limits through the singlet fission mechanism in which two triplet excitons can be generated from a single singlet exciton. The unique spin signatures of triplet excitons makes them ideally suited for investigations using spin-resonance techniques. We propose to study the interaction between spin dynamics and transport properties using a novel technique where triplet excitons are coupled to a microwave superconducting resonator which can simultaneously probe transport and spin-resonance signals (see sketch below). By performing these measurements at sub-Kelvin temperatures, we aim to unravel the quantum mechanical processes giving rise to singlet fission.