Metal halides/chalcogenides nano-materials for opto-electronic applications

Samenvatting

Metal halides perovskites with nanoscale geometries have revolutionized the field of solution-processed photovoltaics and light-emitting devices due to their strong absorption and exceptional photoluminescence properties combined with a remarkable tolerance to structural defects. However, the further development of these materials to practical commercialization is hindered by their toxic components like lead, and by their inherent structural lability. Moreover, at a fundamental level, we still have little understanding about their crystallographic structures, chemical and physical interactions, and surface chemistry. So far, lead-free alternatives have been explored using double perovskites or replacement of Pb with more benign metals but without reaching the performance of their lead-analogs.
I propose to develop various forms of non-toxic highly photoluminescence materials, including nanocrystals, thin-films and composites, for lighting applications, a field in which I have a broad expertise. I will explore the following three key innovations: 1) synthesis of novel halides/chalcogenides perovskites semiconductors nanocrystals without lead; 2) development of core/shell heterostructures to improve the stability and the performance of the nanocrystal; 3) introduction of a conductive matrix for templating ultrasmall nanoparticles and ensuring electronic bridges between particles.
Up to now, the shallow search for metal chalcogenide-halides perovskite materials has not led to stable absorbers or emitters in bulk, but the huge variety of possible mixtures, combined with the small sizes and possible quantum confinement of the corresponding nanocrystals, make the proposed materials appealing for research and practical applications. Therefore, I will also focus on the fundamental understanding about the atomistic description of the perovskite nanocrystals, their surface chemistry and how their chemical interactions affect their physical properties.
This research project will open up important new avenues towards materials with strong potential to be employed in displays and photodetectors and will lead to a breakthrough in producing and understanding of novel opto-electronic nano-materials.

Kenmerken

Projectnummer

VI.Veni.192.048

Hoofdaanvrager

Dr. L. Protesescu

Verbonden aan

Massachusetts Institute of Technology

Uitvoerders

Dr. L. Protesescu

Looptijd

01/09/2019 tot 31/08/2022