Exploring novel applications of Chalcogenide Perovskites

• Autores: Jinan Hussein Awadh Alshuhaib
• Directores de la Tesis: Fabrice Leardini (dir. tes.)
• Lectura: En la Universidad Autónoma de Madrid ( España ) en 2024
• Idioma: inglés
• Número de páginas: 173
• Títulos paralelos:
  • Explorando nuevas aplicaciones de Perovskitas de Calcogenuro
• Tribunal Calificador de la Tesis: Miguel Algueró Giménez (presid.), Gema Tabares Jiménez (secret.), M. Cruz López Escalante (voc.)
• Materias:
  • Ciencias de la tierra y del espacio
• Enlaces
  • Tesis en acceso abierto en: Biblos-e Archivo
• Resumen

  • The rational design of new materials is essential for the development of all areas of technology. From energy-related applications to biomedicine, material properties play a key role in almost all processes. In many cases, these materials are based on critical elements that are scarce on the Earth's crust. In this context, finding alternatives based on abundant and non-toxic elements is necessary. This thesis work has been focused on the synthesis and characterization of different chalcogenide compounds, based on abundant and benign elements, pointing at their use in different applications.

    First, molybdenum disulfide (MoS2) ultrathin films have been grown onto several substrates using salt-assisted chemical vapor deposition. To achieve this objective, a new experimental setup has been designed and installed. The obtained films have been subsequently used as (photo)-cathodes for water splitting applications and as a saturable absorbers Q- switch lasing at the nanoscale, in collaboration with other researchers.

    Second, different chalcogenide perovskites have been synthesized and characterized. These compounds are a new class of semiconductors that have recently emerged and gained considerable focus for photovoltaic and optoelectronic applications. In particular, we have investigated two chalcogenide perovskites: the emerging strontium titanium trisulfide (SrTiS3), which has been synthesized in a bulk form via a novel method and used for thermoelectric applications and photo-electrochemical production of hydrogen for the first time. Moreover, SrTiS3 has been grown as a thin film for the first time. However, the obtained films were contaminated with a surface carbon layer, thus hindering their potential applications. Next, we have focused on barium zirconium trisulfide (BaZrS3), which is the most investigated compound from this family. In this thesis work, lanthanide ions (Ln3+) have been successfully incorporated into the BaZrS3 structure for the first time. This has allowed to use this chalcogenide perovskite as a sensitizer that can absorb light in the visible region and activate the near-infrared photoluminescence of the lanthanide Ln3+ ions. Finally, several unsuccessful attempts have been made to synthesize calcium titanium trisulfide (CaTiS3), which is a material that has not been experimentally reported until now