Title: "Photoresponse of ferroelectric BaTiO3 thin films"

Date: Monday, 24 July 2017
Time: 11:00 am
Place: Sala d'actes Carles Miravitlles

Abstract: 
The main objective of this thesis is to understand photoelectric effects on nanometric BaTiO₃ thin film and give light on relevant mechanisms that control them, aiming to build a more comprehensive understanding of its properties and to guide potential applications. Photoelectric effects studied in this thesis mainly refer to short-circuit photocurrents (J_sc) and the effect of light on polarization (P), focusing on the following aspects:

1. Influence of imprint E_imp and depolarization E_dep fields on the photoresponse in BaTiO₃ thin films.
2. Influence of microstructure and surface adsorbates on the photoresponse in BaTiO₃ thin films.
3. Attempt to narrow the band-gap of BaTiO₃ thin films.

Supervisors:

• Prof. Josep Fontcuberta Griñó
• Dr. Ignasi Fina Martínez

PhD Committee: 

• President: Dr. Brahim Dkhil, Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupélec, Université Paris-Saclay, Paris, France
• Secretary: Dr. Mariano Campoy-Quiles, Department of Nanostructured Materials for Optoelectronics and Energy Harvesting, Institut de Ciència de Materials de Barcelona, Bellaterra, Spain
• Vocal: Dr. Ingrid Cañero Infante, Département de l'électronique, Nanotechnologies de Lyon, Lyon, France