2D Hybrid Perovskite For Next Generation Photodetectors

Abstract

In this thesis we investigate some key aspects and applications of the 2D hybrid perovskite fluorinated phenylethylammonium lead iodide. First, we develop a method for processing the fragile perovskite crystals into devices using top-down electron beam lithography. This is achieved by consideration of processing solvents and other lithography parameters which leads us to develop perovskite based photodetectors. The detectors are then characterised and their figures of merit are compared to perovskite photodetectors fabricated with solvent free methods. Both detectors are found to exhibit extraordinary optoelectronic characteristics ranging from ultra-fast response times to enormous device detectivities. We find that these figures of merit are linked to trap induced defect states introduced in the crystal during synthesis. Finally, we investigate the use of these photodetectors in a range of applications from camera pixels to heart rate monitors. This is made possible by our development of an effective encapsulant that allows us to employ the detectors outside of the lab environment whilst significantly increasing their lifetime.