Synthesis and characterization of multifunctional nanocomposite-based materials for next-gen energy solutions
- Autores: Jaume Noguera Gómez
- Directores de la Tesis: Rafael Abargues López (dir. tes.), Pablo Pérez Boix (codir. tes.)
- Lectura: En la Universitat de València ( España ) en 2025
- Idioma: español
- Tribunal Calificador de la Tesis: Iván Mora-Seró (presid.), Michele Sessolo (secret.), Monica Morales Masis (voc.)
- Programa de doctorado: Programa de Doctorado en Química por la Universitat de València (Estudi General) y la Universitat Politècnica de València
- Materias:
- Enlaces
- Tesis en acceso abierto en: TESEO
- Resumen
Metal halide perovskites have garnered significant attention due to their outstanding optoelectronic properties, positioning them as promising candidates for a wide range of applications, from light-emission technologies to photovoltaics. Despite their potential, practical implementation faces challenges such as stability issues, material degradation, and scalability. In this context, this Thesis investigates innovative strategies to address these challenges, emphasizing the controlled synthesis of perovskite nanocrystals within a metal-organic host matrixes and extending this methodology to explore their potential in perovskite solar cells.
Chapters 4, 5 and 6 explore the potential of the in situ synthesis of perovskite nanocrystals within host matrixes, effectively addressing the limitations associated with conventional synthetic methods. This approach leverages critical parameters, including precursor concentration and ambient conditions, to precisely control crystallization dynamics, enabling fine-tuning of nanoparticle size and emission properties. Building upon this foundation, a detailed protocol is developed for synthesizing MAPbBr3 nanocrystals within a Ni(AcO)2 matrix, ensuring reproducibility and scalability. The protocol outlines how particle size, and hence optical characteristics, can be finely tuned during the crystallization process. The approach demonstrates versatility by enabling the synthesis of nanocrystals with diverse halide compositions, such as chloride, bromide, iodide, and their mixtures, while significantly enhancing stability against degradation factors like oxygen, UV light, temperature, and moisture. Additionally, the water-mediated crystallization mechanism of the nanocrystals is further explored, revealing that humid conditions facilitate the transformation of 0D MA4PbBr6 structures into highly emissive 3D MAPbBr3 NCs. The acetate plays a pivotal role as a mediator, driving hydroxide ions generation and subsequent trap passivation. Detailed spectroscopic and structural analyzes elucidate the reversible role of hydroxide ions in enhancing stability and optical performance. In Chapter 7, the incorporation of Ni(AcO)2 to stabilize CsPbI3, a promising inorganic perovskite with an optimal bandgap (~1.73 eV) for solar cells, is further explored. Devices fabricated using this approach demonstrated power conversion efficiencies exceeding 12%, with prolonged operational stability of over 600 hours at MPPT under controlled inert conditions. Furthermore, efficiencies of 15-17% under white illumination highlight their potential for indoor energy harvesting.
Overall, these findings present a robust, scalable, and cost-effective method for synthesizing diverse perovskite semiconductor materials, paving the way for their integration into next-gen optoelectronic devices.
