Optical and photonic properties of perovskite waveguides and lightemitting devices
Perovskite semiconductors hold large promise for opto-electronic applications such as solar cells and light-emitting diodes (LEDs). In just a few years of research, perovskite LEDs have reached an external quantum efficiency of about 20%, almost at par with incumbent technologies. By optical pumping, it has been established that the threshold power needed to observe amplified spontaneous emission and obtain lasing is as low as for other direct-bandgap semiconductors (such as III-V). Also in our labs, we routinely observe evidence of stimulated emission by optical pumping. Still, it has not been possible to reach lasing by electrical pumping in these systems. The goal of this PhD is to work towards this target. The main focus of the PhD thesis is the characterization and the optical modelling of the optical and photonic properties of the perovskite semiconductors, material stacks, and final devices. The sequel of research items is described in the section methodology.